Consulta: subjectFacets:"Urea"
Registros recuperados: 168
Data/hora: 16/06/2024 04:26:54

Dinamica ruminal e pos ruminal da cana-de-acucar e do farelo de algodao em bovinos alimentados com farelo de algodao e cana-de-acucar suplementada com tres diferentes niveis de ureia.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FIGUEIRA, D. G.; AROEIRA, L. J. M.; RODRIGUEZ, N. M.; SAMPAIO, I. B. M.; LOPES, F. C. F.; TORRES, M. P.
Tipo: Artigo de periódico
Palavras-chave: Taxa de passagem; Sugar cane; Passage rate; Cana de Açúcar; Uréia; Urea.
Ano: 1993
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/591637

Production of annual ryegrass with different doses of nitrogen fertilization in topdressing.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: BOLKE, D. R.; HAYGERT-VELHO, I. M. P.; TIMM, L. C.; ALESSIO, D. R. M.; MITTELMANN, A.; FERREIRA, O. G. L.; LIMA, L. H. C.; VELHO, J. P.
Tipo: Artigo de periódico
Palavras-chave: Exponential growth model; Degree-days; Dry matter; Thermal sum; Rate of accumulation; Urea.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117860

Alterações renais funcionais em caprinos submetidos a infusão intravenosa de hemolisado.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: PINHEIRO, R. R.; HAGIWARA, M. K.; KOGIKA, M. M.; BENESI, F. J.
Resumo: 0 presente estudo foi realizado em 32 caprinos, adultos, Sem Raça Definida (SRD), sendo 16 machos e 16 fêmeas, com propósito de constatar a existência de alteraçoes funcionais renais em caprinos submetidos à aplicaçào intravenosa de hemolisado, através de quantificação dos níveis séricos de uréia e creatinina. Constituiram-se 4 grupos, cada um composto de 8 animais, dos quais 5 foram submetidos a infusao de hemolisado e 3 permaneceram como controle. Nos animais os grupos l, II e III retiraram-se volumes sangüíneos respectivamente a 5, 10 e 15 ml/kg de peso corpóreo. Cada animal do grupo hemólise recebeu, por via intravenosa lenta, após ruptura mecânica das hemacias por congelamento, o hemolisado em igual volume ao sangue retirado. Os animais...
Tipo: Artigo de periódico
Palavras-chave: Níveis séricos; Biouímica sérica; Kidney; Serum level; Caprino; Rim; Ureia; Creatinina; Goats; Urea; Creatinine; Kidneys.
Ano: 1990
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/514137

Reduction of crude protein in diets fed to lactating Holstein-Gyr cows.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: GUIMARÃES, C. R.; AZEVEDO, R. A. de; CAMPOS, M. M.; MACHADO, F. S.; PEDROSO, A. M.; CARVALHEIRA, L. de R.; TOMICH, T. R.; PEREIRA, L. G. R.; COELHO, S. G.
Abstract The objective of this work was to evaluate the effect of reducing crude protein (CP) contents in diets with a constant metabolizable protein content on the intake, performance, nitrogen balance, and nutrient digestibility of lactating Holstein-Gyr cows. Animals (n = 24, 103±23 days in milk) were allocated to four treatments (n = 6 per group) with different CP contents: 127, 132, 139, and 156 g kg-1 dry matter (DM). DM intake was not affected by treatments. CP intake and digestibility increased linearly with higher CP contents. Milk yield (23.7±3 kg per day) and the percentages of milk protein (3.3±0.2%) and fat (3.8±0.5%) were not affected by CP reduction. Milk and blood urea nitrogen increased linearly with the increase of CP in the diet,...
Tipo: Separatas
Palavras-chave: Protected soybean meal; Soypass; Nitrogênio; Nitrogen; Urea.
Ano: 2018
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1102120

Embryo development and follicular status of Toggenburg does fed urea diet.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: AMORIM, L. da S.; TORRES, C. A. A.; SIQUEIRA, L. G. B.; FONSECA, J. F. da; GUIMARÃES, J. D.; CARVALHO, G. R. de; ALVES, N. G.; OLIVEIRA, M. M. N. F. de.
Tipo: Separatas
Palavras-chave: Embryo; Follicle; Goat; Superovulation; Urea.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/910244

Perfil metabólico de ovelhas Rabo Largo cridas em dois sistemas de alimentação.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: MELO, F. C. C. de; ARAGÃO, A. A.; PATROCICIO, F. do; COSTA, A. P. da; SOUZA, T. S. de; CARVALHO, F. C. de; PINHEIRO, R. R.
Resumo: O estudo foi realizado na Fazenda Experimental Vale do Acaraú da Universidade Estadual Vale do Acaraú - FAEX, localizada no município de Sobral-CE. Foram utilizadas 40 ovelhas da raça Rabo Largo divididos em dois grupos, os animais do lote suplementado (LSP) tiveram acesso a 300 gramas/cab./dia de feno de leucena (Leucaena leucocephala) durante o período seco e 1% de milho triturado em relação à média de peso vivo durante todo o ano, sendo ajustados semanalmente, além do acesso a água e sal mineral ad libitum. E os animais do lote não suplementado (LNSP) tiveram apenas acesso a água e sal mineral ad libitum. A proteína total não foi influenciada pela suplementação (P&gt;0,05). Já a albumina nas ovelhas suplementadas (2,54±0,37) foi...
Tipo: Parte de livro
Palavras-chave: Perfil metabólico; Período seco; Raça Rabo Largo; Dry period; Supplementary feeding.; Ovino; Nutrição animal; Suplemento alimentar; Uréia; Albumina; Globulina; Alimento para animal.; Sheep; Animal nutrition; Urea; Feeds; Albumins; Globulins.
Ano: 2012
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/952408

Desempenho de bovinos de corte no pasto suplementados com misturas múltiplas contendo uréia e amiréia.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: GONÇALVES, C. C. de M.; TEIXEIRA, J. C.; EVANGELISTA, A. R.; PÉRES, J. R. O.; MUNIZ, J. A.
O presente trabalho foi realizado com o objetivo de avaliar o real potencial da amiréia 1 50S comparada com mistura equivalente em uréia, milho moído e flor de enxofre, como ingredientes em misturas múltiplas para bovinos de corte no pasto; Foram utilizados 40 bezerros sem raça definida, com peso médio de 167 Kg, no período das águas, e 40 bezerros sem raça definida, com peso médio de 285 Kg, no período seco; Os tratamentos foram baseados na amiréia 1 50S e mistura equivalente em milho moído, uréia e flor de enxofre com núcleo mineral e sal, sendo esse em dois níveis para regular consumo.
Tipo: Artigo de periódico
Palavras-chave: Bovino corte; Brachiaria brizanrha; Mistura múltipla; Amireia; Eextrusion; Multiple mxture; Amido; Brachiaria Brizantha; Extrusão; Uréia; Beef cattle; Starch; Urea.
Ano: 2003
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/706635

Nutritional value of hay from maize-crop stubble ammoniated with urea.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: MOREIRA FILHO, M. A. M.; ALVES, A. A.; VALE, G. E. S. do; MOREIRA, A. L.; ROGERIO, M. C. P.
Abstract: The objective of this research was to evaluate the chemical composition and in situ degradability of hay stubble from a maize crop fertilized with 40; 120 or 200 kg N ha-1, ammoniated with urea. To evaluate in situ degradability, 4 g samples were incubated in nylon bags in the rumen of cattle for 6; 24 and 72 hours. The levels of acid detergent fiber (35.4% DM) and acid detergent insoluble nitrogen (18.5% of total N) decreased, resulting in 32.7% of DM and 9.6% of the total N, and crude protein (CP) increased from 5.2 to 9.7% of DM as a result of the ammoniation with urea. The degradation of dry matter (48.7%), CP (56.5%) and neutral detergent fiber (33.6%) increased with ammoniation, averaging 54.5 and 75.4, and 38.4% respectively, but was not...
Tipo: Artigo de periódico
Palavras-chave: Degradabilidade in situ; Restolho de cultura; Feno amonizado; Hay ammoniated; Amonização; Ammoniation; Nutritional value.; Maize; Milho; Forragem; Ureia; Valor nutritivo; Alimento para animal; Nutrição animal; Alimentação.; Crop residues; Forage; Degradation; Urea; Catch crops; Animal nutrition; Feeds.
Ano: 2013
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/982895

Agroeconomic response of inoculated common bean as affected by nitrogen application along the growth cycle.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SOUSA, M. A.; OLIVEIRA, M. M.; ASOBIA, P. C.; FLORES, R. A.; FERREIRA, E. P. de B.
Biological nitrogen fixation (BNF) is an alternative for the supply of N, aiming at reducing production costs and environmental impacts of common bean crops. This work aimed to evaluate the agroeconomic performance of the inoculated common bean subjected to N-fertilizer application at different phenological phases. N-fertilizer, in a total of 90 kg ha-1 as urea, was applied at 3 phases: planting (P), phenological phase V4 (V4), and phenological phase R5 (R5) of the common bean, in two field experiments. The used treatments were: P0V40R50, P0V445R545, P0V490R50, P0V40R590, P30V430R530, P30V460R50, P30V40R560, P60V430R50, P60V40R530, and P90V40R50. All treatments were inoculated with peat inoculum containing the commercial strain SEMIA 4077 (Rhizobium...
Tipo: Artigo de periódico
Palavras-chave: Fixação de Nitrogênio; Inoculante; Feijão; Phaseolus Vulgaris; Uréia; Beans; Urea; Nitrogen fixation.
Ano: 2022
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1151645

Uso eficiente de uréia em gramíneas através da modelagem com ferramenta de análise.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SILVA, F. C. da; LEITE, M. A.; BOARETTO, A. E.; BOWEN, W.
O balanço de N nas culturas tem sido pouco estudado e os resultados de pesquisa se referem, geralmente, a apenas um dos aspectos da complexa dinâmica do N no sistema solo-planta-atmosfera por empregar metodologias convencionais que não permitem uma avaliação detalhada dessa dinâmica. A metodologia isotópica (15N) é capaz de acompanhar os destinos do N no solo, pois permite mensurar as taxas específicas, como volatilização, lixiviação, absorção, etc. O projeto visa, na primeira fase, fazer as mensurações das taxas dos processos envolvidos na dinâmica de N nas culturas de trigo e de cana-de-açúcar para calibrar a sua modelagem matemática. Na segunda fase do projeto é feita a validação do modelo já calibrado, conhecendo-se assim a performance do modelo no...
Tipo: Anais e Proceedings de eventos
Palavras-chave: Gramíneas; Modelagem; Dinâmica de nitrogênio; Modeling; Uréia; Models; Urea; Nitrogen.
Ano: 2000
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/7895

Nitrogen recovery from fertilizers and cover crops by maize crop under no-tillage system.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SILVA, E. C. da; MURAOKA, T.; BASTOS, A. V. S.; FRANZINI, V. I.; SILVA, A. da; BUZETTI, S.; SAKADEVAN, K.; SOARES, F. A. L.; TEIXEIRA, M. B.; TRIVELIN, P. C. O.; ARAÚJO, L. C. de.
Crop rotation associated with the use of cover crops promotes the introduction of crop residues to the soil, with direct and indirect effects on theavailability of plant nutrients, especially nitrogen (N). The objectivesof this study wereto estimate the N utilization from15N-ureaand cover crop residues (labelled with 15N)of maizecropsgrown in succession,andevaluate the effectsof the isolated and combined use of cover crops and urea on maize plant height, yield components,andgrain yield, grownunderano-tillage system. Field researchwas conductedin anOxisol (Rhodic Haplustox), Cerrado (Savannah) phase. The experimental design was a randomized block with 20 treatments and four replications in a 5x4 factorial scheme. The treatments were four cover cropsspecies:...
Tipo: Artigo de periódico
Palavras-chave: Savannah; Rotação de culturas; Culturas de cobertura; Maize crop; Milho; Green manures; Urea; Oxisols; Isotope dilution technique.
Ano: 2020
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126338

Fermentation parameters, quality and losses in sugarcane silages treated with chemical additives and a bacterial inoculant.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: PEDROSO, A. de F.; RODRIGUES, A. de A.; BARIONI JUNIOR, W.; SOUZA, G. B. de.
The objective of this trial was to evaluate chemical additives and a bacterial inoculant on the inhibition of alcoholic fermentation and reduction of losses in sugarcane silages. Treatments were (doses on a fresh forage basis): without additive (control); urea (10 g/kg); urea (5 g/kg) + sodium benzoate (0.5 g/kg); sodium benzoate (1 g/kg); urea + ammonium sulfate in a 9:1 relation (10 g/kg); Lactobacillus buchneri (5 × 104 cfu/g). Silages were produced in 10.16- × 30-cm PVC tubes, provided with tight lids adapted with Bunsen valves for gas losses quantification. Minisilos were opened 139 days after ensiling. Ethanol content (227 g/kg dry matter - DM) and total DM loss (30%) were high in the control silage. All additives, except benzoate, decreased ethanol...
Tipo: Artigo de periódico
Palavras-chave: L buchneri; Ammonium sulfate; Ethanol; Sodium benzoate; Urea; Volatile fatty acids.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/916087

Impact of foliar nickel application on urease activity, antioxidant metabolism and control of powdery mildew (Microsphaera diffusa) in soybean plants.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: BARCELOS, J. P. Q.; REIS, H. P. G.; GODOY, C. V.; GRATÃO, P. L.; FURLANI JUNIOR, E.; PUTTI, F. F.; CAMPOS, M.; REIS, A. R.
Tipo: Separatas
Palavras-chave: Soja; Antioxidante; Fungicida; Uréia; Uréase; Soybeans; Antioxidant activity; Fungicides; Nickel; Urea.
Ano: 2018
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103447

NMR relaxometry for hygroscopicity evaluation in fertilizers.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: NOVOTNY, E. H.; MATTOS, B. B.; CARVALHO, C. M. de; OLIVEIRA-SILVA, R. de; RECH, I.; POLIDORO, J. C.; TEIXEIRA, P. C.; BONAGAMBA, T. J.
This work aimed to evaluate the effect of increasing amounts of anti-humectant (zeolite) in the dynamics of water absorption in high hygroscopicity urea-based fertilizers in a saturated atmosphere through NMR measurements.
Tipo: Anais e Proceedings de eventos
Palavras-chave: Relaxometria; Higroscopicidade; Uréia; Higroscopia; Urea; Hygroscopicity.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115798

Residual effect of nitrogen fertilizers formulated with biochar.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: CARVALHO, T. A. de; PUGA, A. P.; PIRES, A. M. M.; LIGO, M. A. V.; ANDRADE, C. A. de.
Abstract: Biochar-based nitrogen fertilizers provide productivity and efficiency of nitrogen use gains, but knowledge is scarce about the residual effect for subsequent crops. We evaluated the residual effect of biochar-based nitrogen fertilizers formulated with urea and charcoal fines residues from the coal manufacturing process for the supply of the Brazilian steel park. The treatments tested were related to the residual effect of 80 kg Nha-1 applied via side dressing in an experiment with corn cultivation under field conditions. After corn harvesting, soil samples from the 0-15 cm layer were collected from each experimental plot, respecting the treatments represented by the following sources of N, besides the control: ammonium nitrate, urea and three...
Tipo: Artigo de periódico
Palavras-chave: Biochar-based fertilizer; Black oat; Enhanced-efficiency fertilizer; Fertilidade do Solo; Uréia; Urea; Biochar; Soil fertility.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1121343

Natural phenolic aldehydes as platforms for the development of novel urease inhibitors.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: MODOLO, L. V.; HORTA, L. P.; MARRIEL, I. E.; FÁTIMA, A. de.
Tipo: Parte de livro
Palavras-chave: Fertiizer application.; Fertilizante; Urease; Ureia; Urea; Fertilizers.
Ano: 2014
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/999393

Use of encapsulated nitrate in supplements for grazing cattle during the rainy season reduces methane emission.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FERNANDES, R. M.; FRIGHETTO, R. T. S.; SAKAMOTO, L.; BERNDT, A.; ARAUJO, R. C. de; RESENDE, F. D. de; SIQUEIRA, G. R.
This study aimed to evaluate the effects of including encapsulated nitrate in a supplement for grazing Nellore cattle during the rainy season on animal performance and methane production. A randomized complete block design was adopted, with paddocks representing the experimental units (six animals per paddock for performance, and two animals for methane production, with an average initial weight of 282 kg ± 14), totaling 12 experimental units. Treatments were applied to the animals via a protein-energy supplement in the amount of 0.5% of their body weight (BW), as follows: Control (CTL ? supplement containing urea (25 g/100 kg BW); Encapsulated nitrate (EN - supplement containing encapsulated nitrate providing 70 g encapsulated nitrate or 47 g NO3?/100 kg...
Tipo: Separatas
Palavras-chave: Encapsulated nitrate; Ureia; Metano; Urea; Methane.
Ano: 2016
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068105

Performance of buffaloes on cultivated pastures of Brachiaria humidicola with mineral supplements containing urea.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: NASCIMENTO, C. N. B. do; CARVALHO, L. O. D. de M.; SIMAO NETO, M.; DUTRA, S.; BELTRÃO JUNIOR, N. S.
Tipo: Parte de livro
Palavras-chave: Bubalino; Suplementação; Buffalo; Supplementation; Brachiaria Humidicola; Ganho de Peso; Nutrição; Uréia; Nutrition; Urea; Weight gain.
Ano: 1994
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/394338

Alternativas atuais e potenciais de suplementacao alimentar de caprinos no semi-arido do Nordeste.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: GUIMARAES FILHO, C.
A caprinocultura na regiao semi-arida do Nordeste se caracteriza pela extensividade e por baixos niveis de produtividade decorrentes, principalmente, da acentuada variacao estacional na oferta de forragem da caatinga, a qual constitui sua base alimentar. Existe um consenso quando a necessidade de suplementar os animais nos periodos criticos, tanto com energia como com proteina. As alternativas atualmente disponiveis, como a palma forrageira (Opuntia ficus indica Mill), os restolhos de cultura, e o capim buffel (Cenchrus ciliaris L.) sao volumosos de reduzido valor energetico e sao mais utilizados dentro de um enfoque de sobrevivencia dos animais. Os suplementos de maior valor nutritivo sao de uso limitado e apresentam prblemas de economicidade. As...
Tipo: Artigo de periódico
Palavras-chave: Suplementacao alimentar; Periodo seco; Leucena; Supplementary feeding; Dry period; Pigeonpea; Caprino; Forragem; Guandu; Leucaena; Nutrição Animal; Uréia; Animal nutrition; Urea.
Ano: 1986
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/132182

Enhanced-efficiency fertilizers in nitrous oxide emissions from urea applied to sugarcane.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SOARES, J. R; CANTARELLA, H.; VARGAS, V. P; CARMO, J. B. do; MARTINS, A. A; SOUSA, R. de M.; ANDRADE, C. A. de.
Abstract: The environmental benefits of producing biofuels from sugarcane have been questioned due to greenhouse gas emissions during the biomass production stage, especially nitrous oxide (N2O) associated with nitrogen (N) fertilization. The objective of this work was to evaluate the use of nitrification inhibitors (NIs) dicyandiamide (DCD) and 3,4 dimethylpyrazole phosphate (DMPP) and a controlled-release fertilizer (CRF) to reduce N2O emissions from urea, applied at a rate of 120 kg ha?1 of N. Two field experiments in ratoon cycle sugarcane were performed in Brazil. The treatments were (i) no N (control), (ii) urea, (iii) urea+DCD, (iv) urea+DMPP, and (v) CRF. Measurements of N2O fluxes were performed using static chambers with four replications. The...
Tipo: Separatas
Palavras-chave: Óxido nítrico; Fertilizante; Ureia; Cana de açúcar; Impacto ambiental; Urea; Nitrogen fertilizers; Sugarcane; Environmental impact; Nitrous oxide; Greenhouse effect.
Ano: 2015
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1013414

Canopy structure, behavioral and physiological aspects of pasture-finished sheep using castor bean cake as alternative input.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: MENESES, A. J. G.; POMPEU, R. C. F. F.; SALLES, H. O.; FARIAS, A. S. S.; NENEM, L. H. S.; COSTA, C. S.; GUEDES, L. F.; MARANGUAPE, J. S.; PEREIRA, P. L.; CÂNDIDO, M. J. D.
Abstract: The purpose was to evaluate structural characteristics of pasture, behavioral aspects and physiological parameters of sheep finished on irrigated Tamani grass pasture under continuous stocking, using castor bean cake as alternative input. Structural characteristics of the pasture were assessed in a randomized block design in 2 x 2 factorial arrangement, with two sources of nitrogen fertilization (mineral - urea and organic - in natura castor bean cake) and two supplements (with or without detoxified castor bean cake), in four replications (paddocks). Behavioral aspects and physiological parameters were assessed in a randomized block design with four treatments, and repeated measures over time in eight replications (sheep). Total forage biomass,...
Tipo: Artigo de periódico
Palavras-chave: Rectal temperature; Santa Inês; Índice de área foliar; Temperatura retal; Torta de mamona; Adubação nitrogenada; Brasil; Semiárido; Ovino; Nutrição Animal; Alimento Para Animal; Ricinus Communis; Fêmea; Biomassa; Uréia; Terminação; Ruminant nutrition; Leaf area index; Sheep feeding; Dietary supplements; Feed supplements; Females; Biomass; Urea; Finishing; Nitrogen fertilizers; Semiarid zones; Brazil.
Ano: 2024
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1163640

Comportamento de borregos alimentados com diferentes fontes protéicas na ração concentrada.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: CÂNDIDO, M. J. D.; ANDRADE, I. R. A. de; SILVA, L. V. da; POMPEU, R. C. F. F.; BERNARDES, D. F. V.; ALENCAR, C. E. M. de.
Avaliou-se o comportamento de borregos Morada Nova confinados e alimentados com fontes alternativas de proteína na ração concentrada. Utilizaram-se três diferentes fontes protéicas alternativas na ração concentrada em substituição ao farelo de soja: feno do folíolo da leucena (FFL), uréia (ambas substituindo 100% do farelo de soja) e torta de algodão (substituindo em 51,8%, com base na matéria seca). Ao longo de 24 horas e a intervalos de 10 minutos foram estimados o tempo de ingestão de ração, de ruminação, de outras atividades e de ócio, acordado ou dormindo. Nos intervalos entre as observações acima, foi acompanhada a freqüência de defecação, micção e ingestão de água. Não houve diferença entre tratamentos para o tempo de ingestão de ração e de ócio...
Tipo: Anais e Proceedings de eventos
Palavras-chave: Comportamento; Raça Morada Nova; Torta de algodão; Cotton meal; Brasil.; Semiárido; Leucena; Ovino; Uréia; Leucaena Leucocephala; Pennisetum Purpureum; Alimento Para Animal; Feno.; Sheep feeding; Lambs; Lamb feeding; Urea; Feeding behavior; Brazil; Semiarid soils.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/902982

Épocas, formas de aplicação e doses de nitrogênio na cultura do milho em condições de cerrado.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: NETTO, M. de S.; OLIVEIRA, F. C. de; ARAÚJO, L. da S.; SILVEIRA, P. M. da; CUNHA, P. C. R. da.
Objetivou-se avaliar diferentes épocas, formas de aplicação e doses de nitrogênio nas características agronômicas, componentes de produção, produtividade de grãos, bem como a eficiência de utilização do nutriente na cultura do milho. O delineamento experimental de blocos casualizados, em esquema fatorial (2 x 2 x 4) e quatro repetições, foi utilizado para o experimento. Os tratamentos foram duas épocas de aplicação (semeadura do milho e em cobertura no estádio V7); duas formas de aplicação (superficial e incorporada ao solo a 8 cm de profundidade); e quatro doses de nitrogênio (0, 60, 120, 180 kg ha-1). As características agronômicas do milho, altura da planta, altura da inserção da espiga, diâmetro do colmo e nitrogênio foliar não diferiram em função das...
Tipo: Artigo de periódico
Palavras-chave: Milho; Zea Mays; Fertilizante Nitrogenado; Nitrogênio; Cerrado; Época de Aplicação; Corn; Nitrogen fertilizers; Urea; Cerrado soils; Application timing.
Ano: 2020
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1129355

Effects of nitrogen fertilization on yield components in a corn-palisadegrass intercropping system.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: ALMEIDA, R. E. M. de; FAVARIN, J. L.; OTTO, R.; PIEROZAN JUNIOR, C.; OLIVEIRA, S. M. de; TEZOTTO, T.; LAGO, B. C.
Pasture and grain crop intercropping is considered an alternative for increasing biomass production during the winter periods in Brazil for the establishment of no-tillage systems. We studied nitrogen (N) fertilization rates in a corn-palisadegrass intercropping system that would allow both corn and biomass production without a reduction in corn yield. A field trial was carried out in São Desidério, Bahia - Brazil using a complete block experimental design with a 5 x 2 factorial layout with two factors: N rate (control, 50, 100, 150, and 200 kg ha-1 N) and two cropping systems (corn with or without palisadegrass). Both corn and palisadegrass were sown simultaneously with N fertilizer applied at sowing. The measurements included corn biomass, grain yield...
Tipo: Artigo de periódico
Palavras-chave: Pasture establishment; Plantio direto; Milho; Fertilizante nitrogenado; Cultivo intercalado; No-tillage; Corn; Urea; Urochloa ruziziensis; Intercropping.
Ano: 2017
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1071116

Commodities agrícolas e preço do petróleo.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: BRANDÃO, A. S. P.; ALVES, E. R. de A.
Este artigo tem por objetivo documentar estatisticamente a relação entre preços internacionais de produtos agrícolas e o preço internacional do petróleo. Inicialmente caracteriza-se a relação entre o preço do petróleo e o preço da ureia e, em seguida, como o preço desta e das commodities escolhidas para o estudo se comportam. Os resultados mostram que a tendência no preço desses produtos é influenciada de maneira significativa pela tendência no preço do petróleo. As elasticidades estimadas estão entre 0,47 e 0,61, indicando que entre 50% e 60% das variações no preço do petróleo são transmitidas para os produtos. Ademais, choques transitórios no preço do petróleo têm impactos fortes e duradouros sobre os preços desses produtos.
Tipo: Artigo de periódico
Palavras-chave: Estatística agrícola; Produto; Preço internacional; Petróleo; Ureia; Agricultural products; Statistical analysis; Products and commodities; Petroleum; Urea.
Ano: 2013
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/962648

Desempenho de novilhos Nelore suplementados em pastagens de "Brachiaria humidicola", no período seco do Acre.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: WENDLING, I. J.; CARNEIRO, J. da C.; VALENTIM, J. F.; VALLE, L. A. R.
Este estudo avaliou o ganho de peso vivo de novilhos em pastejo rotativo em pastagem de ?Brachiaria humidicola?, suplementados com sal mineral e sal mineral acrescido de uréia. O experimento foi conduzido de 6 de junho a 21 de setembro de 1999, compreendendo dois ciclos de pastejo. A disponibilidade média de forragem, determinada no início de cada ciclo de pastejo, foi de 4.375 e 4.281 kg/ha de matéria seca de forragem verde, respectivamente, para os tratamentos sal mineral e sal mineral acrescido de uréia. No primeiro ciclo de pastejo, os ganhos médios de peso vivo obtidos pelos animais suplementados com sal mineral acrescido de uréia (0,430 kg/dia) foram superiores (P&lt;0,05) aos observados nos animais que receberam apenas sal mineral (0,320 kg/dia). No...
Tipo: Parte de livro
Palavras-chave: Nutrición animal; Ganado de carne; Raza de bovinos Nelore; Aumento de peso; Pastizales; Pastoreo de rotación; Mineral salt; Nitrógeno no proteico; Fazenda Santo Afonso; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Nutrição Animal; Gado Nelore; Novilho de Corte; Ganho de Peso; Pastagem; Capim Quicuio; Brachiaria Humidicola; Valor Nutritivo; Pastejo Rotativo; Sais Minerais; Uréia; Nitrogênio não Protéico; Animal nutrition; Beef cattle; Nellore; Weight gain; Pastures; Urochloa humidicola; Nutritive value; Rotational grazing; Urea; Nonprotein nitrogen.
Ano: 2003
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/502651

Ureia e nitrato de cálcio em bananeira: atributos químicos e distribuição de N no perfil do solo.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: TEIXEIRA, L. A. J.; NOMURA, E. S; DAMATTO JUNIOR, E.; FUZITANI, E. J.; VIEIRA, H. B.
Atualmente, a área ocupada pela produção de banana no Brasil é uma das maiores entre os frutos para consumo in natura, chegando a quase 500 mil hectares. A bananicultura nacional caracteriza-se principalmente pela diversidade e pela baixa produtividade média por área, o que abre imenso potencial para avanços tecnológicos, visando sua modernização e sustentabilidade da atividade. Entre os possíveis focos para avanços tecnológicos em bananicultura, tem-se o manejo da nutrição. Sabe-se que estado nutricional das plantas regula seu crescimento, susceptibilidade a pragas e doenças, qualidade e volume da produção, com efeitos diretos na viabilidade econômica da cultura. As doses e fontes dos nutrientes aplicados via adubação influenciam não somente o rendimento...
Tipo: Artigo em anais e proceedings
Palavras-chave: Uréia; Nitrogênio; Musa Sapientum; Musa sp; Calcium nitrate; Urea; Musa.
Ano: 2023
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1162789

Efeito residual de fertilizantes nitrogenados formulados com biocarvão.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: CARVALHO, T. A. de; PUGA, A. P.; PIRES, A. M. M.; LIGO, M. A. V.; ANDRADE, C. A. de.
Resumo: O uso do biocarvão (BC) na formulação de fertilizantes NPK (nitrogênio, fósforo e potássio) ou em aplicação direta no solo pode aumentar a eficiência do uso do nitrogênio (EUN). Estudos mostram o aumento na EUN, maior nas parcelas que receberam NPK e BC em comparação com as parcelas que receberam somente NPK. O objetivo foi avaliar o efeito residual do nitrogênio a partir da massa total (parte aérea e raiz) de aveia preta (Avena strigosa Schreb). Foi feito experimento em casa de vegetação, em que foram realizados três cortes consistindo em seis tratamentos: 1) Controle (C); 2) Nitrato de amônio (NA); 3) Ureia (U); 4) Formulado 6 (F6); 5) Formulado 7 (F7) e 6) Formulado 8 (F8) em delineamento inteiramente ao acaso, com quatro repetições, totalizando...
Tipo: Anais e Proceedings de eventos
Palavras-chave: Aveia preta; Eficiência; Biocarvão; Uréia; Fertilidade do Solo; Urea; Biochar; Soil fertility.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1116790

Effect of sources and rates of nitrogen on nutrients extraction in coastcross pastures.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: PRIMAVESI, A. C. P. de A.; PRIMAVESI, O. M. A. S. P. R.; CORREA, L. de A.; CANTARELLA, H.; SILVA, A. G. da; FREITAS, A. R. de.
The contents and the extraction of mineral nutrients were determined in a coastcross pastures established on a dark red lotosol (Hapludox), in Sao Carlos, SP, Brazil, under tropical altitude climate, receving five rates of urea and ammonium nitrate, applied on surface. There weredifference (P&lt;0.05) among sources and rates of N. Nutrients extractionincreased with the nitrogen lelves. Especial high werw total N (319 and 446 kg ha) and K (341 and 467 kg ha) extraction. When forage yield was high (treatment with 500 kg of N ha) and for both fertilizers, macronutrientns extraction was greater for K and, followed by Ca, S. PandMg. Micronutrients extraction ocurred in the following decreasing order: Fe, Mn Zn and Cu.
Tipo: Artigo de periódico
Palavras-chave: Mineral extraction cynodon dactlon cv; Surface application; Extracao mineral; Coastcross; Aplicacao de superficie; Nitrato de amonia; Ammonium nitrate; Urea.
Ano: 2001
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/45255

Chemical composition and in situ degradability of sugarcane tip hay subjected to alkaline treatment.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FRANCO, L. J. D.; GARCEZ, B. S.; ALVES, A. A.; AZEVEDO, D. M. M. R.; PARENTE, H. N.; M. FILHO, M. A.; MOREIRA, A. L.; LIMA, F. W. R.
The present study aimed to evaluate the effect of alkaline treatments with urea, NaOH and Ca(OH)2 on chemical composition and in situ ruminal degradability of dry matter, crud protein and neutral detergent fi ber of sugarcane tip hay. Samples were incubated in the rumen of three cannulated cattle for up to 72 hours in a split plot randomized block design. Ammoniation with 6% urea increased (p&lt;0.05) the crude protein content by 13% and reduced the neutral detergent fi ber and insoluble nitrogen content of the hay. When treated with the highest doses of the compounds, there was a high potential degradability of dry matter, crude protein and neutral detergent fi ber, and a shorter neutral detergent fi ber lag time. Ammoniation with urea promotes a...
Tipo: Artigo de periódico
Palavras-chave: Degradabilidade; Hidrolise; Uréia; Saccharum Officinarum; Hydrolysis; Biodegradability; Urea.
Ano: 2022
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1143035

Wheat nitrogen utilization efficiency and yield as affected by nitrogen management and environmental conditions.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FERREIRA, L. A. R.; SILVA, S. R.; LOLLATO, R. P.; FERREIRA, E. B.; KÖLLN, O. T.
Abstract: Nitrogen (N) is the main nutrient for plant nutrition, however, its fertilization management is still very complex. To evaluate wheat N utilization efficiency (NUtE) and yield in response to N fertilization management considering the influence of environmental conditions, an experiment was carried out in three field conditions in Southern Brazil: Londrina in rainfed and irrigation conditions, and Ponta Grossa in rainfed. A complete (2 × 2 × 2) + 1 factorial arrangement evaluated two N rates (40 and 80 kg ha-1), two N sources (ammonium nitrate and urea), two N timings of fertilization (at sowing or at the beginning of plant tillering), and additional treatment without N fertilization. Agronomic characteristics related to wheat productivity and N...
Tipo: Artigo de periódico
Palavras-chave: Adubação nitrogenada; Fonte de nitrogênio de fertilizante; Nitrogen source of fertilizer; Nitrogen timing of fertilization; Abacate; Nitrato de Amônio; Triticum Aestivum; Uréia; Ammonium nitrate; Urea; Spring wheat.
Ano: 2021
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1140142

Adubação nitrogenada e consorciação do milho com brachiaria ruziziensis em sistema plantio direto.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SANTOS, F. C. dos; KURIHARA, C. H.; ALBUQUERQUE FILHO, M. R. de; RESENDE, A. V. de; CARVALHO, M. da C. S.; ALVARENGA, R. C.
A produtividade do milho, bem como da forragem, quando em consórcio, pode ser influenciada pela adubação nitrogenada, bem como pelo arranjo entre as plantas. Assim, esse trabalho objetivou avaliar o efeito da adubação nitrogenada e consorciação do milho com Brachiaria ruziziensis sobre aspectos produtivos dessas culturas, em sistema plantio direto. Utilizou-se o delineamento experimental de blocos ao acaso, com os tratamentos distribuídos em parcelas subdivididas, com quatro repetições. Foram testadas três modalidades de cultivo (milho solteiro, consorciado com braquiária na entrelinha e consorciado com braquiária na linha + entrelinha do milho) nas parcelas e cinco doses de N total (0, 50, 100, 150, 200 kg ha-1) nas subparcelas. Avaliaram-se o rendimento...
Tipo: Parte de livro
Palavras-chave: Sistema Santa Fé; Nitrogênio; Uréia; Grão; Rendimento; Plantio direto; Brachiaria ruziziensis; Milho; Matéria seca; Nitrogen; Urea; Grains; Yields.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/897760

Biomass and nutrient accumulation by cover crops and upland rice grown in succession under no-tillage system as affected by nitrogen fertilizer rate.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SILVA, E. C. da; MURAOKA, T.; BASTOS, A. V. S.; FRANZINI, V. I.; BUZETTI, B.; SOARES, F. A. L.; TEIXEIRA, M. B.; BENDASSOLLI, J. A.
Cover plants are intended to cover the soil, protecting it from erosion, nutrient leaching, and providing nutrients through recycling or biological fixation. The objectives of this study were to evaluate the dry biomass productivity and total accumulation of nutrients in the cover crops shoots and in the upland rice grown in succession; and evaluate the effect of the isolated and combined use of cover crops and urea on upland rice crop, grown under no-tillage system. The field experiment was conducted at Selvíria-MS, Brazil, in an Oxisol (Rhodic Haplustox), cerrado (savannah) phase. The experimental design was randomized blocks, in a 5x3 factorial scheme. The treatments were four cover crops species: sunn hemp (Crotalaria juncea L.), pigeon pea (Cajanus...
Tipo: Artigo de periódico
Palavras-chave: Biomassa seca; Mucuna prurens; Nutrient cycling; Arroz; Oryza Sativa; Arroz Sequeiro; Crotalária Juncea; Cajanus Cajan; Pennisetum Glaucum; Biomass; Grasses; Mineralization; Urea; Legumes.
Ano: 2020
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124863

Adubação nitrogenada e consorciação do milho com brachiaria ruziziensis em sistema plantio direto.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SANTOS, F. C. dos; KURIHARA, C. H.; ALBUQUERQUE FILHO, M. R. de; RESENDE, A. V. de; CARVALHO, M. da C. S.; ALVARENGA, R. C.
A produtividade do milho, bem como da forragem, quando em consórcio, pode ser influenciada pela adubação nitrogenada, bem como pelo arranjo entre as plantas. Assim, esse trabalho objetivou avaliar o efeito da adubação nitrogenada e consorciação do milho com Brachiaria ruziziensis sobre aspectos produtivos dessas culturas, em sistema plantio direto. Utilizou-se o delineamento experimental de blocos ao acaso, com os tratamentos distribuídos em parcelas subdivididas, com quatro repetições. Foram testadas três modalidades de cultivo (milho solteiro, consorciado com braquiária na entrelinha e consorciado com braquiária na linha + entrelinha do milho) nas parcelas e cinco doses de N total (0, 50, 100, 150, 200 kg ha-1) nas subparcelas. Avaliaram-se o rendimento...
Tipo: Parte de livro
Palavras-chave: Nitrogênio; Uréia; Grão; Rendimento; Nitrogen; Urea; Grains; Yields.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/897689

Polymer-coated urea in broadcast or furrow application in the corn-palisadegrass intercropping system.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: ALMEIDA, R. E. M. de; FAVARIN, J. L.; OLIVEIRA, F. B.; PIEROZAN JUNIOR, C.; OLIVEIRA, S. M. de; LAGO, B. C.; TEZOTTO, T.; OTTO, R.; TRIVELIN, P. C. O.
Polymer coated urea (PCU) have the potential to increase nitrogen (N) use efficiency (NUE) by the release of N following crop demand while reducing losses by volatilization, leaching and denitrification. However, the NUE of PCU is still unclear especially in systems of corn-palisadegrass intercropping. Broadcast application of urea result in ammonia volatilization losses, new technologies must be adopted in order to allow broadcast application of urea. The aim of this research was to evaluate NUE from PCU in the corn-palisadegrass intercropping system and the viability of the broadcast application using PCU. Two field trials were carried out in a 4 × 2 factorial design including fertilization treatments and application forms. Fertilization treatments were:...
Tipo: Artigo de periódico
Palavras-chave: Brachiaria; Capim Urochloa; Nitrogênio; Sustainable agriculture; Intercropping; Urea; Polymer-coated urea.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1109021

Sequential injection system for potentiometric determination of urea in wines with immobilized enzyme.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: NOGUEIRA, A. R. de A.; REIS, B. F.; MONTENEGRO, M. C. B. S.; ARAUJO, A. N.; LIMA, J. L. F. C.
Different wines were analyzed by using the system, and an analytical curve based on urea was run.
Tipo: Separatas
Palavras-chave: Sequential analysis; Análise sequencial; Uréia; Vinho; Urea; Wines.
Ano: 1997
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/44063

Composição química e digestibilidade in vitro do pedúnculo de caju.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: FREIRE, A. P. A.; ARAÚJO, A. B.; GOMES, G. M. F.; BITTAR, C. M. M.; ROGERIO, M. C. P.
O presente trabalho se propõe a avaliar a composição química-bromatológica e a digestibilidade in vitro do pedúnculo de caju, um subproduto fibroso, tratado ou não tratado com ureia.
Tipo: Anais e Proceedings de eventos
Palavras-chave: Amonização; Pedúnculo de caju; Subproduto agroindustrial.; Nutrição animal; Alimento para animal; Alimento alternativo; Uréia; Digestibilidade In Vitro.; Animal nutrition; Animal feeding; Urea; Digestibility; Peduncle; Industrial byproducts; In vitro digestibility.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/916884

The urea transporter DUR3 is differentially regulated by abiotic and biotic stresses in coffee plants.
Provedor de dados: Acesso Livre à Informação Científica da Embrapa (Repositório Alice)
Autores: SANTOS, T. B. dos; BABA, V. Y.; VIEIRA, L. G. E.; PEREIRA, L. F. P.; DOMINGUES, D. S.
The high costs of N fertilizers in the coffee production emphasizes the need to optimize fertilization practices and improve nitrogen use efficiency. Urea is widespread in nature, characterizing itself as a significant source of nitrogen for the growth and development of several organisms. Thus, the characterization of genes involved in urea transport in coffee plants is an important research topic for the sustainable production of this valuable cash crop. In the current study, we evaluated the expression of the DUR3 gene under abiotic and biotic stresses in coffee plants. Here, we show that the expression of a high-affinity urea transporter gene (CaDUR3) was up-regulated by N starvation in leaves and roots of two out of three C. arabica cultivars...
Tipo: Artigo de periódico
Palavras-chave: Nitrogen; Nutrient deficiencies; Gene expression; Urea; Transporters.
Ano: 2021
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1139281

Effect of nitrogen fertilization on productivity and quality of Mombasa forage (Megathyrsus maximum cv. Mombasa)
Provedor de dados: Acta Agronómica
Autores: Munari-Escarela,Carolina; Pietroski,Marizane; Mello-Prado,Renato de; Silva-Campos*,Cid Naudi; Caione,Gustavo.
Abstract Mombasa grass is very demanding and responsive to soil fertility. The objective of the present study was to evaluate forage production and the correlation among crude protein and the green color index of leaves of Megathyrsus maximum cultivar Mombasa in function of nitrogen levels. The study was conducted using 5 dm-3 pots in a greenhouse at the Universidade Estadual Paulista - UNESP, Jaboticabal, São Paulo. The experimental design consisted of randomized blocks with five treatments and four replications. Treatments were nitrogen rates (0, 62.5, 125, 250 and 500 mg dm-3 of N), corresponding to 0, 125, 250, 500 and 1000 kg ha-1 of N. We evaluated the production of grass dry matter, the green color index, the accumulation of nitrogen and crude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Forage; Plant nutrition; Protein; Urea.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100042

Evaluación de métodos de propagación, fertilización nitrogenada y fenología de estevia en condiciones del Valle del Cauca
Provedor de dados: Acta Agronómica
Autores: Bonilla C,Carmen R; Sánchez O,Manuel S.; Perlaza,Diego F.
En el Centro Experimental de la Universidad Nacional de Colombia sede Palmira se evaluó el prendimiento de estacas apicales y basales de Stevia rebaudiana en tres sustratos de enraizamiento (carbonilla-arena, carbonilla-compost y arena-compost) y tres fuentes de nitrógeno (urea 46%N, compost 1.5%N y gallinaza 1% N). El mejor método de propagación fue la estaca apical en sustrato carbonilla-arena 1:1, volumen; las fuentes de nitrógeno no presentaron diferencias significativas en la acumulación de materia seca de hojas. Se diferenciaron los siguientes periodos fenológicos: Emergencia: 6 días después de la siembra (dís), Estado vegetativo: 17 dias, Floración: 71 dís, Fructificación: 115 dís, Senescencia: 169 dís y Rebrote: 201 dís
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hierba dulce; Carbonilla; Arena; Urea; Carbonilla; Arena.
Ano: 2007
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122007000300004

Fuentes y dosis de nitrógeno en el crecimiento inicial de arroz (Oryza sativa L.) de secano
Provedor de dados: Acta Agronómica
Autores: Barzan,Renan Ribeiro; Sandoval Contreras,Héctor Augusto; Osorio García,Nicolás Arturo.
Resumen Las fuentes más usadas de nitrógeno (N) en arroz son la urea y el sulfato de amonio, que tienen eficiencia muy variable debido a diferentes pérdidas que pueden ocurrir, lo que hace que aumente la dosis de N y los costos de producción. Por ello, el objetivo de la investigación fue evaluar fuentes y dosis de fertilizantes nitrogenados para el cultivo de arroz de secano. El trabajo se instaló en una casa de vegetación con el cultivar FL 8468 utilizando vasos plásticos con capacidad de 4 kg de suelo. Los tratamientos fueron de cinco dosis (0, 50, 100, 150 y 200 kg N ha-1) y tres fuentes de nitrógeno (urea, sulfato de amonio y sulfammo), con un delineamiento enteramente aleatorizado en un esquema factorial de 5 x 3, con cuatro repeticiones. El resultado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorción de nitrógeno; Eficiencia agronómica; Urea; Sulfato de amonio; Sulfammo.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000400405

Efecto de la aplicación de zeolita en la recuperación de nitrógeno y el rendimiento de maíz
Provedor de dados: Acta Agronómica
Autores: Obregón-Portocarrero,Nicolás; Díaz-Ortiz,Jaime Ernesto; Daza-Torres,Martha Constanza; Aristizabal-Rodríguez,Héctor Fabio.
La baja eficiencia de la fertilización nitrogenada ocasiona altos costos de producción y es responsable en un alto porcentaje de la contaminación ambiental; para reducir estos impactos negativos existen estrategias como la aplicación de zeolitas (clinoptilolita) que reducen las pérdidas de nitrógeno (N) en sistemas productivos. El objetivo de este estudio fue evaluar el efecto de la aplicación de zeolita en la recuperación de N y el rendimiento de maíz (Zea mays L.), cuando se aplicó en dosis de 15, 25 y 35 kg/ha conjuntamente con 100 kg/ha de N utilizando urea en un diseño experimental de bloques completos al azar con cuatro repeticiones. La zeolita incidió significativamente (P &lt; 0.05) en el rendimiento del cultivo, la altura de planta y el diámetro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clinoptilolita; Eficiencia de uso; Urea; Isótopo 15N; Zeolita.
Ano: 2016
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122016000100004

Efectos del Monascus sobre albúmina, creatinina, urea y ácido úrico en conejos
Provedor de dados: Acta Bioquímica Clínica Latinoamericana
Autores: Toledo de Oliveira,Tânia; Nagem,Tanus Jorge; Matos Lopes,Renato; Machado,Hussein; Jóia de Mello,Vanessa; Queiroga de Lima,Ednaldo; da Silva Martins,Eliene.
El presente trabajo tiene como objeto verificar la acción de tres dosis del colorante Monascus sobre el metabolismo de la albúmina, urea, creatinina y ácido úrico en conejos de ambos sexos. Se usaron conejos de la raza Nueva Zelanda, obtenidos del Departamento de Cunicultura de la Universidad Federal de Viçosa (Brasil) de unos 55 días de edad y que pesaban cerca de 1700 g al momento del experimento. Los animales fueron divididos por sexo constituyéndose cuatro grupos de cinco animales cada uno, que recibieron el colorante Monascus en las dosis de 24, 48 y 60 mg/kg. El grupo control recibió solamente ración alimenticia. Los animales recibieron, diariamente, durante 28 días, las cápsulas que contenían el colorante Monascus en las respectivas dosis. Se...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monascus; Albúmina sérica; Creatinina; Urea; Ácido úrico.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0325-29572005000400003

Fontes e doses de adubação nitrogenada na atividade microbiana e fertilidade do solo cultivado com Brachiaria brizantha - doi: 10.4025/actasciagron.v33i2.3946
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Delbem, Flavia Cristina; UNESP - Araçatuba; Scabora, Márcia Helena; Unesp - Ilha Solteira; Soares Filho, Cecílio Viega; Unesp; Heinrichs, Reges; Unesp - Dracena; Crociolli, Carlos Alberto; Unesp; Cassiolato, Ana Maria Rodrigues; Unesp - Ilha Solteira.
As pastagens geralmente perdem seu potencial produtivo e vigor de rebrota nos primeiros anos, frequentemente associada à falta de adubação nitrogenada. O objetivo deste foi verificar o efeito de fontes e doses de adubação nitrogenada na atividade microbiana (carbono da biomassa microbiana e carbono do CO2 liberado) e na fertilidade do solo cultivado com Brachiaria brizantha cv. Xaraés. O delineamento experimental foi em blocos casualizados, em arranjo fatorial 3 x 4, envolvendo três fontes de nitrogênio (uréia, sulfato de amônio e Ajifer-L40) e quatro doses de nitrogênio (0, 100, 200 e 400 kg ha-1), nas profundidades 0 - 0,10 e 0,10 - 0,20 m, com três repetições. O aumento nas doses de nitrogênio, na camada 0,0 a 0,10 m de profundidade, reduziu os valores...
Palavras-chave: 5.01.01.00-5    Ciência do Solo Ajifer; Biomassa microbiana; Mineralização do C; Sulfato de amônio; Ureia Ajifer; Microbial biomass; C mineralization; Ammonium sulfate; Urea.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3946

Colonização micorrízica e fertilidade do solo submetido a fontes e doses de adubação nitrogenada em Brachiaria brizantha - doi: 10.4025/actasciagron.v32i3.4002
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Delbem, Flavia Cristina; Progama de Pós-Graduação em Ciência Animal, Universidade Estadual Paulista, Campus de Araçatuba; Scabora, Márcia Helena; Programa de Pós-Graduação em Produção Vegetal, Universidade Estadual Paulista, Campus de Ilha Solteira; Soares Filho, Cecílio Viega; Universidade Estadual Paulista, Campus de Araçatuba; Heinrichs, Reges; Universidade Estadual Paulista, Campus de Dracena; Ferrari, Tiago Augusto; Progama de Pós-Graduação em Ciência Animal, Universidade Estadual Paulista, Campus de Araçatuba; Cassiolato, Ana Maria Rodrigues; UNESP, Ilha Solteira.
The feasibility and increase in the production of new cultivars can be obtained with the practice of nitrogen fertilization. The objective of this study was to verify the effect of sources and levels of nitrogen fertilization, concerning the depths, on the percentage of mycorrhizal colonization and soil fertility when covered by Brachiaria brizantha cv. Xaraés. A randomized blocks design was used and the treatments were under a 3 x 4 factorial scheme, regarding three nitrogen sources (urea, ammonium sulfate, and ajifer-L40) and 4 nitrogen levels (0, 100, 200 and 400 kg ha-1), studied at 2 different depths (0-0.10 and 0.10-0.20 m), with 3 replications. In each plot, the soil samples, composed of 5 simple samples, were collected, sieved, homogenized and sent...
Palavras-chave: 5.01.01.04-8 Ajifer; Sulfato de amônio; Ureia; Pastagem Microbiologia e Bioquímica do Solo Ajifer; Ammonium sulfate; Urea; Pasture.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4002

Nitrogênio em cobertura e molibdênio via foliar no feijoeiro irrigado cultivado em solo de cerrado - doi: 10.4025/actasciagron.v33i4.6387
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Biscaro, Guilherme Augusto; Universidade Federal da Grande Dourados; Freitas Junior, Nasir Augusto de; Universidade Estadual de Mato Grosso do Sul; Soratto, Rogério Peres; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Kikuti, Hamilton; Universidade Estadual de Mato Grosso do Sul; Goulart Junior, Sidney Antonio Roseiro; Universidade Estadual de Mato Grosso do Sul; Aguirre, Washington Marques; Universidade Estadual de Mato Grosso do Sul.
O nitrogênio é o nutriente exigido em maior quantidade pelo feijoeiro e, mesmo quando suprida adequadamente desse nutriente, a planta de feijão pode ter sua produtividade limitada pela deficiência de molibdênio, pela participação deste no metabolismo do nitrogênio. O objetivo deste trabalho foi avaliar a resposta do feijoeiro (Phaseolus vulgaris L.), cultivar ‘BRS Pontal’, irrigado, à aplicação de nitrogênio em cobertura e molibdênio via foliar, quando cultivado em Neossolo Quartzarênico, no município de Cassilândia, Estado do Mato Grosso do Sul. O delineamento experimental foi o de blocos ao acaso, no esquema fatorial 4 x 2, com quatro repetições. Os tratamentos foram constituídos de quatro doses de nitrogênio (0, 30, 60 e 120 kg ha-1) aplicados em...
Palavras-chave: Produção vegetal Phaseolus vulgaris; Adubação nitrogenada; Adubação foliar; Nutrição mineral; Molibdato de amônio; Ureia Phaseolus vulgaris; Nitrogen fertilization; Leaf application; Mineral nutrition; Ammonium molybdate; Urea.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6387

Influência de fontes de nitrogênio no consumo e digestibilidade aparente total e parcial de novilhos alimentados com cana-de-açúcar - DOI: 10.4025/actascianimsci.v31i3.6831
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Silveira, Roselene Nunes da; UNIRP; Berchielli, Telma Teresinha; UNESP, Jaboticabal; Canesin, Roberta Carrilho; UNESP, Jaboticabal; Messana, Juliana Duarte; UNESP, Jaboticabal; Reis, Ricardo Andrade; UNESP, Jaboticabal; Resende, Kleber Tomás de; UNESP, Jaboticabal.
Objetivou-se, com este trabalho, avaliar os efeitos de fontes de nitrogênio, utilizando-se como volumoso a cana-de-açúcar, suplementada com ureia, glúten de milho-60 ou farelo de soja, sobre o consumo e a digestibilidade aparente total e parcial, em novilhos mestiços. Os tratamentos foram: cana-de-açúcar, cana-de-açúcar suplementada com ureia, glúten de milho-60 ou farelo de soja. Foram utilizados oito novilhos canulados no rúmen e duodeno, distribuídos em dois quadrados latinos 4x4. Para se determinar a digestibilidade aparente no trato digestivo total foi utilizada a coleta total de fezes. As determinações das digestibilidades ruminal e intestinal e dos fluxos diários de matéria seca foram estimadas por meio da fibra em detergente ácido indigestível...
Tipo: Pesquisa de campo; análise laboratorial
Palavras-chave: 5.04.00.00-2; 5.04.05.00-4; 5.04.03.02-8 digestibilidade intestinal e ruminal; Farelo de soja; Fibra detergente ácido indigestível; Glúten de milho-60; Uréia Zootecnia acid detergent insoluble fiber; Corn gluten meal-60; Intestinal digestibility; Ruminal digestibility; Soybean meal; Urea.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6831

Morphogenesis in pastures with Tanzania grass fertilized with nitrogen doses under a grazing system
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Soares Filho, Cecilio Viega; Cecato, Ulysses; Ribeiro, Ossival Lolato; Roma, Claudio Fabrício da Cruz; Beloni, Tatiane.
The morphogenetic and structural characteristics, coupled to forage production of Tanzania grass with nitrogen (N) doses during the seasons of the year, at intermittent grazing, were analyzed. The experimental design consisted of a totally randomized block with split plots and four replications. The plots comprised 0, 150, 300 and 450 kg ha-1 N levels, whereas the sub-plots were the seasons. Urea was applied three times on the pasture and had a positive effect on the rates of leaf elongation and emergence and on the number of live leaves of Tanzania grass in the spring and summer. High nitrogen fertilization associated with shorter grazing intervals triggered a higher percentage of leaf blades in the management of Tanzania grass under rotational stocking...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.04.00-8 Panicum maximum; Grazing; Leaf appearance rate; Leaf elongation rate; Urea.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27101

Morphogenesis and structure of Tifton 85 cultivated in subtropical climate and fertilized with nitrogen
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Tiecher, Diego Daniel; Rocha, Marta Gomes da; Pötter, Luciana; Salvador, Paulo Roberto; Bergoli, Tuani Lopes; Milanesi, Gabriela Descovi.
The experiment evaluated the morphogenesis and structure of Tifton 85 (Cynodon spp.) cultivated in subtropical climate and fertilized with nitrogen (N). The experiment was a completely randomized design with four levels of N (Zero; 75; 150 or 225 kg ha-1) in nine replicates per area. The experimental animals were Suffolk female lambs. The grazing method was continuous to maintain the sward height at 15 cm ± 10%. The stem expansion increased by 0.000027 cm degree-days-1 to each kg N applied (linear model). According to nonlinear model, the highest stem expansion (0.0226 cm degree-days-1) was observed with the use 220.1 kg ha-1 N. The leaf lifespan fitted a linear regression model, with increase of 50 degree-days leaf -1, comparing the levels zero and 225 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zootecnia; Medicina Veterinária; Agronomia Cynodon spp.; Phyllochron; Marked tillers; Urea.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/32147

Nitrogenous compounds balance and microbial protein synthesis in steers supplemented with sunflower crushed in partial replacement of soybean meal - doi: 10.4025/actascianimsci.v35i3.18654
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Lima, Hellen Leles; Universidade Federal da Grande Dourados; Goes, Rafael Henrique de Tonissi e Buschinelli de; Universidade Federal da Grande Dourados; Oliveira, Euclides Reuter de; Universidade Federal da Grande Dourados; Gressler, Maria Gizelma de Menezes; Universidade Federal da Grande Dourados; Brabes, Kelly Cristina da Silva; Universidade Federal da Grande Dourados; Gabriel, Andrea Maria de Araújo; Universidade Federal da Grande Dourados.
Four steers in individual paddocks with Marandu grass (B. Brizantha) in 4x4 square design were used to evaluate sunflower crushed supplementation in pasture-grazing animals on nitrogen balance and microbial protein synthesis. Supplements at 6 g kg-1 body weight comprised corn, soybean meal, and mineral and soybean meal substituted at proportions 0, 20, 40 and 60%. Diet contained averages 6.79, 6.96, 7.10 and 6.87% nitrogen respectively for substitution levels 0, 20, 40 and 60%. The inclusion of sunflower crushed (SC) increased nitrogen intake and fecal excretion of nitrogen while providing a positive balance. Animals’ plasma urea concentration supplemented with SC was 28.13% lower than that of supplemented animals without SC. SC inclusion did not change...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.04.01-6 creatinine; Microbial efficiency; Plasma urea; Purine derivatives; Urea Creatinine; Microbial efficiency; Plasma urea; Purine derivatives; Urea.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/18654

Inclusion of propylene glycol in the diet of sheep and its effect on their lambs’ protein and mineral metabolites
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Santos, Rogério Pereira dos; Macedo Junior, Gilberto de Lima; Silva, Simone Pedro da; Sousa, Luciano Fernandes de; Andrade, Marina Elizabeth Barbosa.
 The aim of this study was to assess the effect of propylene glycol (PG) added to the water sheep drank during lactation on protein and mineral metabolites of their suckling lambs. We assessed 24 lambs born to sheep fed levels of propylene glycol in the water (0; 1.5; 3.0 and 4.5%). The sheep were subdivided according to a completely randomized design, in a split-plot scheme. There was no interaction effect between lamb age and amount of PG provided to the sheep on the concentration of protein and mineral metabolites of the lambs. The concentration of total protein, globulin, and albumin: globulin ratio, uric acid and creatinine in the lambs was not affected by the inclusion of PG (p &gt; 0.05). The concentration of urea and magnesium in the lambs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrição Animal; Nutrição Ruminantes albumin; Globulin; Sheep; Protein; Urea; Water.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/35101

Chemical changes in sunflower silage associated with different additives - doi: 10.4025/actascianimsci.v35i1.14049
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Goes, Rafael Henrique de Tonissi e Buschinelli de; Universidade Federal da Grande Dourados; Miyagi, Eliane Sayuri; Universidade Federal da Grande Dourados; Oliveira, Euclides Reuter de; Universidade Federal da Grande Dourados; Brabes, Kelly Cristina da Silva; Universidade Federal da Grande Dourados; Patussi, Rosielen Augusto; Universidade Federal da Grande Dourados; Dambrós, Carlos Eduardo; Universidade Federal da Grande Dourados.
Thirty-six experimental silos arranged in a completely randomized 4 x 3 factorial design were provided to evaluate the chemical changes of sunflower silage treated with soybean hulls, sunflower crushed and urea at 14, 21 and 28 days of ensilage. The additives were based on 5% natural matter, whereas control consisted of silage with 100% sunflower plant. OM, NDIP, and MM had average rates 911.2; 86.6 and 92.9 g kg-1 of dry matter respectively. The addition of soybean hulls and sunflower crushed increased DM rates after 28 and 21 days. Urea increased nitrogen fractions and the addition of soybean hulls increased total carbohydrate content of silage by 5.1%, whereas the addition of sunflower crushed decreased the same by 2.18%. NDF, ADF and hemicellulose...
Tipo: Pesquisa
Palavras-chave: 5.04.03.03-6 sunflower crushed; Lignin; NDF; PH; Soybean hulls; Urea.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/14049

Características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias e estratégias de adubação nitrogenada - doi: 10.4025/actascianimsci.v33i4.10212
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Teixeira, Fábio Andrade; UESB; Bonomo, Paulo; UESB; Pires, Aureliano José Vieira; UESB; Silva, Fabiano Ferreira; UESB; Martins, Giselle Caroline Fernandes; UESB; Cardoso, Elisângela Oliveira; UESB.
O objetivo deste trabalho foi avaliar as características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias, visando determinar a estratégia mais adequada de adubação nitrogenada. Foram estudadas quatro estratégias de adubação no início e no final do verão (0-0, 100-0, 50-50, 0-100 kg ha-1 de N), respectivamente, com quatro repetições. Para avaliação das densidades volumétricas, a forragem foi colhida em três estratos: estrato A- acima de 40 cm; B- 20-40 cm; e C- 0-20 cm do solo. O índice de tombamento foi menor (p &lt; 0,05) para a estratégia de adubação com 100 kg ha-1 de N aplicados no final do verão. No estrato B foram observadas maiores (p &lt; 0,05) densidades de forragem total, de lâmina foliar e de colmo verde para estratégia de...
Tipo: Pesquisa de campo
Palavras-chave: Forragicultura e pastagens acamamento; Densidade; Diferimento; Pastagem; Perfilho; Ureia falling; Density; Deferment; Grazing; Tiller; Urea.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10212

Urea and Tannin in multiple supplements: Ingestive behavior of grazing beef cattle
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Araujo, Hellen Patricia de Oliveira; Paula, Nelcino Francisco de; Martello, Hariany Ferreira; Teobaldo, Ronyatta Weich; Pereira, Luana Barros; Mora, Lays Martins; Valentim, Jean Kaique; Antunes, Hellen Cristina Ferreira.
This work was carried out to evaluate the inclusion of urea and tannin in multiple supplements on ingestive behavior of cattle in pasture. The experiment was taken in the Cattle Nutrition pasture of the Experimental Farm of the Federal University of Mato Grosso, in 4 x 4 Latin square design with a factorial arrangement 2 x 2 (with and without urea and with and without tannin). Four Nellore bulls were used, with average weight of 470 kg and an average age of 20 months, randomly divided in: Supplement without urea and without tannin, Supplement without urea and with tannin, supplement with urea and without tannin, and supplement with urea and with tannin. The level of supplementation used was 1% of body weight during the dry period of the year. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural additives; Forage; Supplementation; Urea; Tannins.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/47607

Tiller population density in deferred Urochroa decumbens pasture and strategies for nitrogen fertilization - doi: 10.4025/actascianimsci.v35i1.10243
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Teixeira, Fábio Andrade; Universidade Estadual do Sudoeste da Bahia; Bonomo, Paulo; Universidade Estadual do Sudoeste da Bahia; Pires, Aureliano José Vieira; Universidade Estadual do Sudoeste da Bahia; Silva, Fabiano Ferreira; Universidade Estadual do Sudoeste da Bahia; Abreu Filho, George; Universidade Estadual do Sudoeste da Bahia; Viana, Pablo Teixeira; Universidade Estadual do Sudoeste da Bahia.
The objective of this work was to evaluate the tiller population density in Urochroa decumbens pasture deferred for 95 and 140 days, aiming to determine the best strategy for nitrogen fertilization. Four fertilization strategies at the beginning and end of summer (0-0, 100-0, 50-50, 0-100 kg  ha-1 of N) were studied, respectively, with four repetitions. For the pastures deferred for 95 days, the population densities of vegetative tillers were greater (p &amp;lt; 0.05) for the strategy 0-100. At the end of the deferment period, the weight of the vegetative tillers per hectare was greater for the strategy 0-100, followed by the strategy 50-50. The densities of vegetative tillers, evaluated in the pastures deferred for 140 days, were greater (p &amp;lt; 0.05)...
Tipo: Pesquisa de campo
Palavras-chave: Density; Deferment; Grazing; Tiller; Urea.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10243

Economic viability of production of Nellore heifers on Urochloa brizantha cv. Marandu pastures deferred and fertilized with nitrogen
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Aguilar, Poliana Batista de; Teixeira, Fábio Andrade; Silva, Fabiano Ferreira da; Pires, Aureliano José Vieira; Nascimento, Paulo Valter Nunes; Santos, Otanael Oliveira dos.
The objective of this study was to evaluate the effect of different levels of nitrogen on deferred pastures of Urochloa brizantha cv. Marandu, and the implications on the economic viability of production of Nellore heifers. This was a completely randomized design with four treatments (T1 = deferred pasture without nitrogen fertilization; T2 = deferred pasture fertilized with 50 kg N ha-1, T3 = deferred pasture with 100 kg N ha-1, T4 = deferred pasture with 150 kg N ha-1) and four replications (16 fertilized paddocks). First, there were used 48 Nellore heifers, average eight months of age and initial body weight of 178.69 ± 26.67 kg, with three heifers in each paddock, in all treatments, in a continuous grazing system, with variable stocking rate. Only the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Economic analysis; Deferment; Nitrogen fertilization; Profitability; Urea.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28375

Performance of steers supplemented with mineral mixtures in the State ofMato Grosso
Provedor de dados: Acta Scientiarum: Animal Sciences
Autores: Oliveira, Euclides Reuter de; Universidade Federal da Grande Dourados; Paiva, Paulo César de Aguiar; Universidade Federal de Lavras; Babilônia, José Libêncio; Centro Federal de Educação Tecnológica de Mato Grosso; Gabriel, Andréa Maria de Araújo; Universidade Federal da Grande Dourados; Monção, Flávio Pinto; Universidade Estadual Paulista "Júlio de Mesquita Filho"; Nascimento, Felipe de Almeida; Universidade Federal da Grande Dourados.
The present study evaluated the effects of supplements on the productive performance and economical parameters of beef steers on pastures during the dry season. Twenty-four castrated steers with average age and weight of eighteen months and 269 kg, respectively, were evaluated in the following treatments: pasture without minerals (P); pasture and mineral salt (PMS) and pasture and mineral salt plus urea (PMSU). The chemical composition showed low contents of crude protein and high values of neutral and acid detergent fiber for forages sampled in the form of complete collection compared with the grazing simulation technique. The supplementation with mineral salt plus urea led to a higher average daily gain (p &amp;lt; 0.05) than the animals on pasture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.00.00-2 cattle; Economic evaluation; Production; Urea.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/22499

Drying Temperature - Duration Impacts on Moisture, Carbon, and Nitrogen Losses from Broiler Litter
Provedor de dados: Agricultural Engineering International : The CIGR e-journal
Autores: Sanjay B. Shah; NC State University.
Drying poultry litter (PL) prior to analysis minimizes nutrient transformations and losses and facilitates sample preparation. Drying also allows comparison among different litters on dry-weight (dw) basis. However, losses of carbon (C) as CO2 and nitrogen (N) as NH3 (NH3) can confound moisture losses. Thus, the apparent moisture content (MC) that does not separately account for C and N losses will be higher than the true MC. Further, use of apparent MC may also result in overestimation of C and N concentrations (dw basis). Broiler litter (BL) MC was determined using FD 50 (flask-dried at 50°C for 24 h), FD 70 (flask-dried at 70°C for 16 h), CT70 (oven-dried at 70°C to constant mass), and CT105 (oven-dried at 105°C to constant mass). Carbon and NH3-N...
Palavras-chave: Waste management; Nutrient cycling; Emissions; Pollution Poultry litter  moisture content; Ammonia loss; Carbon dioxide loss; Urea.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2801

Drying Temperature - Duration Impacts on Moisture, Carbon, and Nitrogen Losses from Broiler Litter
Provedor de dados: Agricultural Engineering International : The CIGR e-journal
Autores: Shah, Sanjay B.
Drying poultry litter (PL) prior to analysis minimizes nutrient transformations and losses and facilitates sample preparation. Drying also allows comparison among different litters on dry-weight (dw) basis. However, losses of carbon (C) as CO2 and nitrogen (N) as NH3 (NH3) can confound moisture losses. Thus, the apparent moisture content (MC) that does not separately account for C and N losses will be higher than the true MC. Further, use of apparent MC may also result in overestimation of C and N concentrations (dw basis). Broiler litter (BL) MC was determined using FD 50 (flask-dried at 50°C for 24 h), FD 70 (flask-dried at 70°C for 16 h), CT70 (oven-dried at 70°C to constant mass), and CT105 (oven-dried at 105°C to constant mass). Carbon and NH3-N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste management; Nutrient cycling; Emissions; Pollution Poultry litter  moisture content; Ammonia loss; Carbon dioxide loss; Urea.
Ano: 2014
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2801

Niveles de Urea Láctea en Vacas de la Región del Bío-Bío, Chile
Provedor de dados: Agricultura Técnica
Autores: Pedraza G,Carlos; Mansilla M,Alberto; Merucci D,Fabio; Pinedo,Pablo; Contreras C,Horacio.
El presente estudio se realizó utilizando una base de datos del Servicio de Control Lechero de la empresa Bioleche Ltda., Los Ángeles, Chile. La información fue analizada mediante un modelo matemático que consideró como variable dependiente el nivel de urea en función de los factores: número ordinal de parto, época de parición, nivel de proteína de la leche, nivel de producción diaria de leche, recuento de células somáticas (RCS) y las interacciones entre los factores mencionados. El contenido de urea (mg 100 mL-1) en vacas de primer y de segundo o más partos fue 29,07a y 33,35b (p &lt; 0,05), respectivamente. La estación del año en que ocurrió el parto se asoció significativamente (p &lt; 0,05) con los valores promedios de urea láctea, alcanzando a...
Tipo: Journal article
Palavras-chave: Leche; Proteína; Urea; Recuento de células somáticas; Vacas lecheras.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072006000300005

Effects of nitrogen fertilizer input on the composition of mineral elements in corn grain
Provedor de dados: Agrociencia
Autores: Yu-kui,Rui; Shi-ling,Jiang; Fu-suo,Zhang; Jian-bo,Shen.
Excessive and inappropriate application of industrial N fertilizer can result in severe environmental and ecological problems, but whether the input of N fertilizer could affect the composition of mineral elements in corn has not been reported. Effects of input of N fertilizer on the composition of mineral elements (Se, Mo, I, Mn, Fe, Cu, Zn, Ca, Cr, K, Na, and Mg), in corn grain were investigated by ICP-MS (inductive coupling plasma-mass spectrometry). Se, I, Mn, Fe, Zn, Cr, K and Ca were significantly lower in the treatments with N fertilizer compared to a control without N fertilizer. There was a significant negative conrrelation (R) between four mineral elements and N fertilizer input: I, -0.71; Zn, -0.65; Ca, -0.75; K, -0.89. Therefore appropriate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corn grain; ICP-MS; Plant nutrition; Trace elements; Urea.
Ano: 2009
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952009000100003

Nitrogen topdressing and application ways of fluazifop-p-butyl + fomesafen in weed control and agronomic performance of common bean
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: SILVA,MATHEUS G.; ARF,ORIVALDO; TEODORO,PAULO E.
ABSTRACT The objective of this study was to investigate the effect of interaction between nitrogen topdressing and different application ways (active ingredients) a.i. fluazifop-p-butyl + fomesafen in weed control and agronomic performance of common bean. The experiment was conducted during winter 2003 in Selvíria/MS. The experimental design used was a randomized block design with four replications in a factorial scheme 2x7. The first factor was composed by the absence or presence of nitrogen topdressing, while the second factor consisted of different application ways of fluazifop-p-butyl + fomesafen. The following variables were measured: leaf N content, dry matter of plants, yield components (number of pods plant-1, number of grains plant-1, the average...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilization; Herbicide mixture; Phaseolus vulgaris L.; Urea.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502301

Urease activity according to the different inhibitors
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: GOMES,MATEUS P.; ZONTA,EVERALDO; STAFANATO,JULIANO B.; PEREIRA,ARIANA M.
Abstract The objective of this study was to evaluate NBPT, zeolite and humic acid in different concentrations as inhibitors of the activity of the enzyme urease. The activity of the urease enzyme was quantified by the methods proposed by May and Douglas (1976) and Witte and Medina-Escobar (2001). For this reason, two experiments were conducted in a completely randomized design in split plots, in which the incubation periods are the plots and the fertilizers with the inhibitors at the different concentrations are the subplots with three replications. Fifteen fertilizers based on NBPT-coated urea, humic acid and zeolite were used in different concentrations. The two methods of analysis used in the experiment confirmed the efficiency of NBPT in inhibiting the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic acid; Nbpt; Zeolite; Urea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703685

Ammonia poisoning causes muscular but not liver damage in cattle
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Antonelli,A.C.; Torres,G.A.S.; Soares,P.C.; Mori,C.S.; Sucupira,M.C.A.; Ortolani,E.L.
Twelve steers were intraruminally administered a high dose (0.5g/kg BW) of urea to study the damage effect of ammonia poisoning on liver and/or muscles. Blood samples were collected to determine ammonia and activities of gammaGT, AST and CK. Eleven steers were successfully poisoned and treated properly, but one succumbed. Poisoned cattle showed high concentration of ammonia, and higher activities of AST and CK. The higher the ammonia, the greater were the activities of AST (r=0.59) and CK (r=0.61). The correlation between AST and CK was high and significant (r=0.80), but not between AST and gammaGT (r=0.19). The activities of AST and CK were higher after the beginning of the convulsive episodes due to ammonia poisoning. Those results showed that occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Ammonia poisoning; Urea; Muscle damage; Liver.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352007000100002

Tiller density and tillering on Brachiaria brizantha cv. Marandu pastures inoculated with Azospirillum brasilense
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Pedreira,B.C.; Barbosa,P.L.; Pereira,L.E.T.; Mombach,M.A.; Domiciano,L.F.; Pereira,D.H.; Ferreira,A.
ABSTRACT The objective of this study is to verify the population density and the dynamics of tillering in the Marandu palisade grass sward subjected to nitrogen (N) fertilization strategies, characterized by the N supply via urea or bacterial inoculant (Azospirillum brasilense). The treatments comprised of four nitrogen fertilization strategies: (A) Without fertilization, (B) 80 kg N/ha, (C) inoculant (A. brasilense), and (D) 80 kg N/ha + inoculant, distributed in a randomized complete block design, with three replications. The nitrogen supply strategies were evaluated during six periods: October, November, and December (2012) as well as January, March, and April (2013). The nitrogen dose or inoculant had no effect on the tiller appearance rate (TAR),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diazotrophic bacteria; Nitrogen biological fixation (NBF); Stability index; Tillers; Urea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000401039

Bromatological composition and dry matter digestibility of millet cultivars subjected to nitrogen doses
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Buso,W.H.D.; França,A.F.S.; Miyagi,E.S.
The bromatological composition and in vitro dry matter digestibility of millet cultivars were assessed for different nitrogen doses and two sowing seasons in the Ceres municipality of Goiás state, Brazil. The treatments consisted of three millet cultivars (ADR-7010, ADR-500 and BRS-1501), four nitrogen (N) doses (0, 50, 100 and 200kg ha-1 of N) and two sowing seasons. Three replicates and a randomised block design with a 3 x 4 x 2 factorial scheme were used. Two cuttings were performed in each season when plants reached an average height of 0.70 cm. No significant interactions were observed between or among cultivars for N doses and dry matter (DM), crude protein (CP), neutral detergent fibre (NDF) and acid detergent fibre (ADF) contents. The DM, CP, NDF...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fibres; Forage; Dry matter; Pennisetum glaucum; Protein; Urea.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000300887

Nitrogen recovery efficiency for corn intercropped with palisade grass
Provedor de dados: Bragantia
Autores: Almeida,Rodrigo Estevam Munhoz de; Favarin,José Laércio; Otto,Rafael; Franco,Henrique; Reis,André Froes Borja; Moreira,Lílian Angélica; Trivelin,Paulo.
ABSTRACT Intercropping corn and palisade grass is a technique to increase straw production, soil C contents, nutrient cycling and crop yield. However, concerns arise from nitrogen (N) uptake by the intercropping crop causing reduction in the yield of the corn. Our objective was to evaluate N recovery efficiency (NRE), and the N dynamics in the soil-plant system in corn intercropped with palisade grass. A field trial was carried out in Bahia, Brazil, evaluating two cropping systems: corn (monoculture) and corn intercropped with palisade grass sowed between rows on the same day as the corn crop, with four replicates in a completely randomized block design. Nitrogen (150 kg∙ha–1of 15N-urea) was applied at sowing to determine NRE, which means the amounts of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urochloa ruziziensis; Urea; 15N isotope technique; No-till system; Brazilian Cerrado.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000400557

Nitrogen fertilization in top dressing for wheat crop in succession to soybean under a no-till system
Provedor de dados: Bragantia
Autores: Galetto,Shivelly Los; Bini,Angelo Rafael; Haliski,Adriano; Scharr,Danilo Augusto; Borszowskei,Paulo Rogério; Caires,Eduardo Fávero.
ABSTRACT Agricultural intensification to improve wheat yield has increased the demand for nitrogen fertilizers. This study aimed to investigate the wheat response in succession to soybean due to application of nitrogen rates and sources in top dressing, as well as to determine the N rates of maximum technical yield (MTY) and maximum economic yield (MEY). A field experiment was carried out in Ponta Grossa, Paraná State, Brazil, on a clayey Typic Hapludox (Oxisol) under a continuous no-till. A randomized block design was used, with 3 replications in a 4 × 3 complete factorial arrangement. The treatments consisted of a control and 3 N rates at 40; 80 and 120 kg∙ha−1 as calcium nitrate (CN), ammonium sulfate (AS), and urea (UR) in top dressing at tillering of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Nitrogen; Calcium nitrate; Ammonium sulfate; Urea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200282

Timing and growing conditions of nitrogen topdressing influence the grain yield and protein content of four wheat cultivars
Provedor de dados: Bragantia
Autores: Silva,Raphael Rossi; Zucareli,Claudemir; Fonseca,Cristina de Batista; Riede,Carlos Roberto; Benin,Giovani; Gazola,Diego.
ABSTRACT The application of an adequate rate and splitting of nitrogen is essential for wheat grain yield and protein content. The aim of this work was to adjust nitrogen management approaches regarding agronomic performance and protein content of wheat cultivars in various environments. Field experiments were conducted under no-tillage system on soybean mulch during the 2011 and 2012 growing seasons in Londrina and Pato Branco regions. The experimental design was a randomized block in split plot with four replicates. Four wheat cultivars (IPR Catuara TM, BRS Gaivota, Quartzo, CD 120) were tested with six nitrogen (N) management forms. Were evaluated: number of ears per unit area (NEA); plant height (PH); thousand-kernel weight (TKW); test weight (TW);...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium sulphate grain yield nitrogen Triticum aestivum L; Urea.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300361

Impact of nitrification inhibitor with organic manure and urea on nitrogen dynamics and N2O emission in acid sulphate soil
Provedor de dados: Bragantia
Autores: Shamsuzzaman,Shordar Mohamed; Hanafi,Mohamed Musa Hanafi; Samsuri,Abd Wahid; Halimi,Soud Mohd; Begum,Masuda; Maisarah,Jantan Nur.
ABSTRACT The accurate prediction of N transformation is an important requisite for optimizing N use efficiency in cropping systems. An incubation study was conducted to verify the impacts of nitrification inhibitor (NI) with organic manure (OM) and urea on N dynamics and N2O emission in acid sulphate soil. The conducted experiment was two-level factorial with 4 N sources (N1 = 100% of N from urea, N2 = 75% of N from urea + 25% N from rice straw, N3 = 75% of N from urea + 25% of N from cow dung and N4 = 75% of N from urea + 25% of N from poultry dung) and two levels of NI (with and without DCD). The NI (Dicyandiamide - DCD) with OM + urea enhanced mineral N contents and it was the highest (255.07 µg∙g-1) for urea with DCD applications. The highest net...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DCD; OM; Urea; Mineral N; Net N-mineralization; Net nitrification; N2O emission.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100108

Role of Natural Antioxidants in the Modulation of Plasma Amino Acid Pattern in Rats Exposed to Hemic Hypoxia
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Al-Rasheed,Nouf Mohamed; Fadda,Laila Mohamed; Al-Rasheed,Nawal Mohamed; Attia,Hala; Ali,Hanaa Mahmoud; El-Agami,Hanaa.
ABSTRACTThe aim of this work was to investigate whether the free radical scavengers, L-arginine (L-arg) and/or carnosine, either alone, or in combination would modulate tissue injury induced by hypoxia by measuring Fischer's ratio [concentrations of branched chain amino acids (BCAAs)/aromatic amino acids]. Decreased Fischer's ratios and increased malondialdehyde (MDA) led to pathogeneses of many diseases. Rats were injected with sodium nitrite (60 mg/kg) to establish hypoxia. They were treated with L-arg, (200 mg/ kg) and/or carnosine (200 mg/ kg) and their combination 24 and 1 h prior to sodium nitrite intoxication. The results revealed that hypoxia significantly decreased hemoglobin, arginine, citrulline and proline and increased sLDH, MDA , ammonia ,...
Palavras-chave: Natural antioxidants; Amino acids; Carnosine; L-arginine; Fisher's ratio; Urea.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000500741

The influence of starvation and Eurytrema coelomaticum infection on the nitrogenous products of degradation in the hemolymph of Bradybaena similaris
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Souza,Rosana M. de; Gomes,Edna M.; Chagas,Generoso M.; Pinheiro,Jairo.
The urea and uric acid contents in the hemolymph of Bradybaena similaris were analyzed under starvation and Eurytrema coelomaticum infection during 30 days. The urea and uric acid contents in the uninfected and fed snails were 15.090 mg/dl and 9.399 mg/dl, respectively, being the urea/uric acid ratio 1.6. The urea content in starved snails increased to a maximum of 363.237 mg/dl at 15 days, and the uric acid varied to a maximum of 11.470 mg/dl. The urea content in infected snails was reduced to a minimum of 2.123 mg/dl at 30 days of infection and the uric acid increased significatively at 25 days post exposure, being 13.820 mg/dl. A significative relation was not observed between the time of starvation and time of E. coelomaticum infection and the uric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Uric acid; Starvation; Bradybaena similaris; Eurytrema coelomaticum; Host-parasite relationship.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000400003

Plasma urea levels on reproductive parameters of wool-less rams (Ovis aries, LINNAEUS, 1758)
Provedor de dados: Brazilian Jounarl of Veterinary
Autores: CORTADA,Carmen Neusa Martins; LUCCI,Carlos de Sousa; GONZALEZ,Rodrigo Alonso Forero; VALENTIN,Renato; MATTOS,Carla Balzano de.
The effect of increased plasma urea levels on reproductive parameters of Santa Ines Brazilian breed rams (Ovis aries) was determined during two phases, 60 days in length each. During the first phase, 18 animals divided into three blocks according to scrotal circumference were submitted to the following treatments: diet A1- with nitrogen levels according to ARC (1980); diet B1 - nitrogen levels 133% higher than A1; and diet C1 - nitrogen levels 166% higher than A1. During the second phase, 12 animals divided into two groups received diet A2- with nitrogen levels according to ARC (1980), and diet B2 - nitrogen levels 200% higher than diet A2, respectively. The increase in protein equivalents was obtained by adding 20, 40 and 60 g of feed grade urea to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Semen; Reproduction; Rams; Feed Ration.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962000000600007

Experimental ammonia poisoning in cattle fed extruded or prilled urea: clinical findings
Provedor de dados: Brazilian Jounarl of Veterinary
Autores: Antonelli,Alexandre Coutinho; Mori,Clara Satsuki; Soares,Pierre Castro; Kitamura,Sandra Satiko; Ortolani,Enrico Lippi.
Twelve yearling Girolando, rumen-fistulated steers never fed with urea before, were distributed randomly in 2 groups of 6 animals each. Both groups were administered intraruminally a single dose (0.5 g/kg BW) of extruded (G1) or prilled (G2) urea to induce ammonia poisoning. The clinical picture was followed for the next 240 min. Besides the classic signs the present study found 3 new additional sign: dehydration, hypothermia and ingurgitated episcleral veins. Convulsion, considered the definite sign, was seen in 5 out of 6 animals from both groups. One steer (G1) had only fasciculation, while another (G2) developed typical clinical signs, but not convulsion, and recovered spontaneously without treatment. The appearance of clinical signs such as muscle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Ammonia poisoning; Clinical picture; Cattle.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962004000100010

Effect of urea on biomimetic aggregates
Provedor de dados: Brazilian Journal of Medical and Biological Research
The effect of urea on biomimetic aggregates (aqueous and reversed micelles, vesicles and monolayers) was investigated to obtain insights into the effect of the denaturant on structured macromolecules. Direct evidence obtained from light scattering (static and dynamic), monolayer maximum isothermal compression and ionic conductivity measurements, together with indirect evidence from fluorescence photodissociation, fluorescence suppression, and thermal reactions, strongly indicates the direct interaction mechanism of urea with the aggregates. Preferential solvation of the surfactant headgroups by urea results in an increase in the monomer dissociation degree (when applied), which leads to an increase in the area per headgroup and also in the loss of...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Urea; Denaturation; Surfactants; Macromolecular structure.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000200004

Differential capacity of nitrogen assimilation between apical and basal leaf portions of a tank epiphytic bromeliad
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Takahashi,Cassia A.; Ceccantini,Gregório C.T.; Mercier,Helenice.
The leaf is the main organ of the vegetative body of tank epiphytic bromeliads, which may be subdivided into apical and basal parts. Little is known about the existence of morphological, anatomical or physiological differences between these two leaf portions. The objective of this study was to verify the existence of a differential capacity to assimilate nitrogen from urea between basal and apical leaf portions of Vriesea gigantea, a tank epiphytic bromeliad. Plants were cultivated in vitro in the presence of 5 mM urea for 15 days. During this period, the activities of the enzymes glutamine synthetase (GS, EC 6.3.1.2) and NADH-dependent glutamate dehydrogenase (NADH-GDH, EC 1.4.1.2) were quantified, as well as the densities of trichomes and stomata found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Glutamate dehydrogenase; Glutamine synthetase; Stomata; Trichome; Urea.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200004

Effect of Nitrogen Inhibitors on Nitrous Oxide Emissions and Pasture Growth After an Autumn Application in Volcanic Soil
Provedor de dados: Chilean Journal of Agricultural Research
Autores: Vistoso,Erika; Alfaro,Marta; Saggar,Surinder; Salazar,Francisco.
A range of technologies is available to reduce greenhouse gas emissions from agricultural systems. Among these, applying N transformation inhibitors is promising in reducing nitrous oxide (N2O) emissions in both arable and pastoral soils. A randomized complete block design with six replicates was used to quantify the effect of urease (UI) and nitrification (NI) inhibitors on N2O emissions and pasture production from permanent pasture in an Andisol after autumn-applied urea. The N2O emissions were measured periodically for 8 wk with PVC stationary chambers. Mineral N, DM yield, N concentration, and N uptake were analyzed. Our results show that adding fertilizer (40 kg N ha-1) significantly increased N2O emissions by 281% over the control treatment (P &lt;...
Tipo: Journal article
Palavras-chave: Andisol; Emission factor; Urease inhibitor; Nitrification inhibitor; Urea.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000100021

Effect of mineral protein suplements on live weight gain of grazing cattle
Provedor de dados: Ciência e Agrotecnologia
Autores: Rezende,Lucas Alberto Teixeira de; Teixeira,Júlio César; Evangelista,Antônio Ricardo; Pérez,Juan Ramón Olalquiaga; Muniz,Joel Augusto; Gonçalves,Clenderson Corradi de Mattos.
This work was carried out to evaluate the effect of supplements based on non-protein nitrogen (NPN) as: urea, amirea and multinutritional block, on live weight gain and cost analysis for cattle kept in pastures. During a period of 104 days(April to July 2004), 40 crossbreed bulls, uncastrated and initial average weight of 379kg, were allocated into 4 paddocks with Brachiaria brizantha cv. Marandu, in continuous pasture system receiving, in troughs, the following treatments: mineral salt (control), protein supplement containing amirea, protein supplement containing urea and multinutritional block. The experimental design used was randomized blocks with repetition within the block. Results of availability bromatological composition of pasture, supplement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Amirea; Multinutritional block; Brachiaria brizantha; Costs.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000600026

Phytase in rations of growing pigs: performance, blood parameters and bone mineral content
Provedor de dados: Ciência e Agrotecnologia
Autores: Silva,Hunaldo Oliveira; Fialho,Elias Tadeu; Freitas,Rilke Tadeu Fonseca de; Lima,José Augusto de Freitas; Logato,Priscila Rosa Vieira; Schoulten,Neudi Artemio.
It was intended with the present work to verify the effect of phytase on the performance, bone mineralization and content of plasma urea of swine. 80 swine (30 ± 3.1 kg/LW), crossbred (LD x LW) males and females, allocated to a randomized block design (RBD) with four treatments and five replicates. The treatments consisted of a growing swine diet on the basis of corn, soybean meal and defatted rice bran (DRB) supplemented with four levels of phytase (0, 400, 800 and 1200 FTU/kg) The diet was formulated to meet the requirements of growing swine except for available calcium and phosphorus, the levels of which were 0.64 and 0.25%, respectively. The enzyme phytase utilized was Natuphos 5000. Over the experimental period every eight days, blood of two animals...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzyme; Minerals; Plasma; Urea.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542004000600028

Nitrogen loss by volatilization of nitrogen fertilizers applied to coffee orchard
Provedor de dados: Ciência e Agrotecnologia
Autores: Dominghetti,Anderson William; Guelfi,Douglas Ramos; Guimarães,Rubens José; Caputo,André Luiz Carvalho; Spehar,Carlos Roberto; Faquin,Valdemar.
ABSTRACT Ammonia volatilization (N-NH3) is one of the main pathways of Nitrogen loss reducing nitrogen use efficiency in coffee orchard. This work aimed at quantifying ammonia volatilization (N-NH3) losses from N-sources to be used in coffee plantations fertilization in Brazil. The experiment was conducted in the field on a dystrophic red latosol (Ferralsol in FAO's classification) at the Coffee Research Sector, University of Lavras, MG, Brazil. The experimental design was of complete randomized blocks with three repetitions of the following treatments: conventional urea, ammonium nitrate and urea + 0.15% Cu and 0.4% B, urea + anionic polymers, urea + elementary sulfur (S0) + polymers, and urea + plastic resin. These N sources were split into three doses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee arabica; Slow and controlled release and stabilized fertilizers; Ammonium nitrate; Urea.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000200173

Feeding dairy cows with soybean by-products: effects on metabolic profile
Provedor de dados: Ciência Rural
Autores: Alves,Marilia; González,Félix; Carvalho,Nelcy; Mühlbach,Paulo; Lima,Verônica; Conceição,Tiago Reis; Wald,Vera.
Soybean by-products are currently used in Rio Grande do Sul, Brazil, as a source of protein in dairy cows. However, the high protein breakdown of this feed source in the rumen causes loss of the intrinsic quality of the protein and increases plasma urea with deleterious consequences to animal metabolism. Thermal treatment of soybean can overcome this limitation. The aim of this study was to evaluate the metabolism of dairy cows fed with thermally treated soybean and raw soybean, through the analyses of the metabolic profile of plasma and milk. Twelve Holstein cows in mid-lactation period were studied using four treatments: commercial concentrated of protein, soybean meal, raw soybean and roasted soybean. Protein and urea levels in milk were measured in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metabolic profile; Roasted soybean; Dairy cows; Milk; Protein; Urea.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000100037

Prohexadiona de calcio, nitrógeno y rayado de ramas en el crecimiento de brotes vegetativos y floración de otoño de lima persa.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Loyo García, Alejandro.
En el estado de Veracruz, Méx. existen numerosas plantaciones de lima Persa injertado sobre limón Volkameriano (Citrus volkameriana Ten. y Pasq.) que es un portainjerto vigoroso, por ello, el crecimiento de los árboles se controla para aumentar su eficiencia, mejorar la producción y producir fruta en épocas de temporada baja para aprovechar los altos precios de venta en el mercado nacional. El objetivo del presente trabajo fue incrementar la floración en brotes de otoño en los meses de octubre y noviembre mediante la aplicación de podas, un retardante del crecimiento, fertilizaciones foliares nitrogenadas y rayado de ramas. El estudio se hizo en árboles de lima Persa de siete años de edad. Dos experimentos fueron realizados, en el primero, se aplicó en...
Palavras-chave: Citrus latifolia Tan.; Brotes de otoño; Intensidad de floración; Nitrato de calcio; Urea; Maestría; Fruticultura.
Ano: 2010
URL: http://hdl.handle.net/10521/172

Diseño y evaluación de microcápsulas de urea In Vitro para su uso en rumiantes.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Lira Casas, Raymundo.
Las nuevas líneas de investigación en nutrición de rumiantes están buscando diseñar productos con liberación prolongada de urea dentro del rumen. El objetivo de esta investigación fue desarrollar y evaluar microcápsulas que liberen urea en el líquido ruminal. Métodos: Las microcápsulas fueron preparadas por el método de emulsión y evaporación de solvente, como primer paso se preparo el acarreador poroso, después se preparo la fase orgánica con Eudragit RS 100 y por último se preparo la fase acuosa en donde fue agregada la fase orgánica. Las microcápsulas se identificaron mediante microscopia electrónica de barrido, determinando el tamaño y la morfología. Se evaluó la encapsulación de la urea, la flotabilidad de las microcápsulas y la liberación de N...
Palavras-chave: Urea; Microcápsulas; Lenta liberación; Rumiante; Microcapsules; Slow release; Ruminant; Maestría; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/448

Diseño y evaluación de microcápsulas de urea In Vitro para su uso en rumiantes.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Lira Casas, Raymundo.
Las nuevas líneas de investigación en nutrición de rumiantes están buscando diseñar productos con liberación prolongada de urea dentro del rumen. El objetivo de esta investigación fue desarrollar y evaluar microcápsulas que liberen urea en el líquido ruminal. Métodos: Las microcápsulas fueron preparadas por el método de emulsión y evaporación de solvente, como primer paso se preparo el acarreador poroso, después se preparo la fase orgánica con Eudragit RS 100 y por último se preparo la fase acuosa en donde fue agregada la fase orgánica. Las microcápsulas se identificaron mediante microscopia electrónica de barrido, determinando el tamaño y la morfología. Se evaluó la encapsulación de la urea, la flotabilidad de las microcápsulas y la liberación de N...
Palavras-chave: Urea; Microcápsulas; Lenta liberación; Rumiante; Microcapsules; Slow release; Ruminant; Maestría; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/448

Prohexadiona de calcio, nitrógeno y rayado de ramas en el crecimiento de brotes vegetativos y floración de otoño de lima persa.
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Loyo García, Alejandro.
En el estado de Veracruz, Méx. existen numerosas plantaciones de lima Persa injertado sobre limón Volkameriano (Citrus volkameriana Ten. y Pasq.) que es un portainjerto vigoroso, por ello, el crecimiento de los árboles se controla para aumentar su eficiencia, mejorar la producción y producir fruta en épocas de temporada baja para aprovechar los altos precios de venta en el mercado nacional. El objetivo del presente trabajo fue incrementar la floración en brotes de otoño en los meses de octubre y noviembre mediante la aplicación de podas, un retardante del crecimiento, fertilizaciones foliares nitrogenadas y rayado de ramas. El estudio se hizo en árboles de lima Persa de siete años de edad. Dos experimentos fueron realizados, en el primero, se aplicó en...
Palavras-chave: Citrus latifolia Tan.; Brotes de otoño; Intensidad de floración; Nitrato de calcio; Urea; Maestría; Fruticultura.
Ano: 2010
URL: http://hdl.handle.net/10521/172

Ethanol induction of laccase depends on nitrogen conditions of Pycnoporus sanguineus
Provedor de dados: Electronic Journal of Biotechnology
Autores: Hernández,Christian A; Sandoval,Norma; Mallerman,Julieta; García-Pérez,José Antonio; Farnet,Anne-Marie; Perraud-Gaime,Isabelle; Alarcón,Enrique.
Background Ethanol has been pointed out as a laccase inducer. However, there are controversial reports about its efficiency with some fungi. In this study, we hypothesized that ethanol laccase induced in Pycnoporus sanguineus depends on nitrogen nutriment conditions. To prove this, we assessed laccase production in submerged cultures of P. sanguineus, with different nitrogen concentrations and with, or without ethanol added in a factorial designed experiment. Results In order to analyze the effects of factors on the response variables, a factorial ANOVA, and response-surface models were performed. It was found that the nitrogen source was the main factor that affected laccase production in P. sanguineus. The treatments with yeast extract (2 g/L) and...
Tipo: Journal article
Palavras-chave: Enzyme production; Fungal metabolism; Phenoloxidases; Urea; Yeast extract.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000400012

Concentration of injetion solution and its effects on soil and on yield of fertirrigated banana cv. Terra Maranhão
Provedor de dados: Engenharia Agrícola
Autores: Coelho,Eugênio F.; Andrade Neto,Torquato M. de; Barros,Damiana L.
The Fertigation is the combined application of water and nutrients to a crop. It can be adapted to all types of agricultural crops. The objective of this study was to evaluate the effect of urea concentration in irrigation water on electrical conductivity of the soil solution and saturation extract along the first cycle of banana cv. Terra Maranhão. The experiment followed a completely randomized design with six treatments and ten replications. Treatments regarded for using three urea concentrations (1.0; 2.5 and 4.0 g L-1) in irrigation water applied by two micro irrigation systems (microsprinkler and drip). Results showed that there was a linear elevation of electrical conductivity of saturation extract and soil solution with the increase on...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Urea; Salinity; Fertirrigation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600007

Nitrate production and accumulation in lettuce as affected by mineral Nitrogen supply and organic fertilization
Provedor de dados: Horticultura Brasileira
Autores: Pôrto,Mônica L; Alves,Jailson do C; Souza,Adailson P de; Araújo,Raunira da C; Arruda,Jandeilson A de.
Lettuce is one of the leading vegetables in Brazil. However, studies concerning its fertilization for the Northeastern region of the country are still scarce. This work was carried out to evaluate the effects of mineral Nitrogen supply and organic fertilization on the production and nitrate accumulation in lettuce, cultivar Elba, in the semi-arid zone of Paraíba, Brazil. A randomized block design, with four replications, was used to test five doses of cattle manure (30; 60; 90; 120, and 150 t ha-1), five doses of N supplied as urea (30; 60; 90; 120, and 150 kg ha-1), and a control without fertilization. Along with mineral N, the other nutrients were also supplied using mineral sources. No additional nutrients were supplied where organic fertilization was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Lettuce; Cattle manure; Urea; Yield.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362008000200019

Использование мочевины при выращивании синезеленой микроводоросли Spirulina platensis (Nordst.) Geitl. в накопительной культуре
Provedor de dados: IBSS Repository
Autores: Дробецкая, И. В.
Приводятся данные о влиянии различных концентраций мочевины, а также разных соотношений мочевины и нитратов в питательной среде на рост и химический состав Spirulina platensis в условиях накопительной культуры. Установлено, что высокие концентрации карбамида в среде (300 мг азота (N)/л и выше) угнетают рост водорослей вплоть до гибели клеток. Использование мочевины в комплексе с нитратами (в соотношении 1:4 по N) оказывает положительный эффект, выражающийся в увеличении продуктивности культуры и содержания белка, хлорофилла а, С-фикоцианина и каротиноидов в биомассе.
Tipo: Journal Contribution
Palavras-chave: Мочевина; Нитраты; Питательная среда; Продуктивность культуры; Биомасса; Urea; Nitrates; Nutrient; Growth rate; Biomass Urea Nitrates Growth rate Biomass Nitrates Biomass Urea Growth rate http://aims.fao.org/aos/agrovoc/c_5187 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_8090 http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/392

Utilização da amiréia na alimentação de ruminantes.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: SALMAN, A. K. D.
Realizou-se um trabalho de revisão de literatura com o intuito de levantar os motivos pelos quais pode ser vantajoso a produção e utilização da amiréia na alimentação de ruminantes.
Tipo: Folhetos
Palavras-chave: Revisão de literatura; Literature review; Nutrição Animal; Bovino; Uréia; Amido; Alimentação Suplementar; Animal nutrition; Cattle; Dietary supplements; Starch; Urea.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/709704

Amoniação de palhas e de forrragens de baixa qualidade com uréia.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: FILHO, C. G.; MIRANDA, D. B. de.
Benefícios da amoniação; Material que pode ser amoniado; Como amoniar; Como usar o material amoniado.
Tipo: Folhetos
Palavras-chave: Amoniacao; Produção animal; Forragem; Palha; Uréia; Animal production; Ammonium compounds; Forage; Straw; Urea.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132196

Amonização de palhadas e de forragens de baixa qualidade com uréia.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: GUIMARAES FILHO, C.; MIRANDA, D. B. de.
Beneficios da amonização, material que pode ser amonizado, como amonizar e como usar o material amonizado.
Tipo: Folhetos
Palavras-chave: Uso; Amonização; Use; Forragem; Palha; Resto de Cultura; Uréia; Ammonia; Crop residues; Forage; Straw; Urea.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132195

Utilização de cana + uréia na recria de bovinos.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: OLIVEIRA, J. S. e.
Por que ureia?; Por que cana?; Resultados alcancados no CNPGL; A tecnologia; Como facilitar o uso da tecnologia; Resultados alcancados em fazendas comerciais; Cuidados na utilizacao de cana + ureia; Algumas informacoes sobre consumo; Algumas informacoes sobre periodo de adaptacao; exemplo pratico.
Tipo: Folhetos
Palavras-chave: Bovine; Sugar cane; Bovino; Cana de Açúcar; Nutrição; Uréia; Nutrition; Urea.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/595877

Adubação mineral do arroz em solos de campo cerrado de Roraima.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: COUTO, W. S.; CORDEIRO, A. C. C.; ALVES, A. A. C.
Tipo: Folhetos
Palavras-chave: Mineral nutrients; Análise Econômica; Arroz; Cloreto de Potássio; Nutriente Mineral; Uréia; Superfosfato Triplo; Economic analysis; Potassium chloride; Urea; Superphosphate; Rice.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/379483

Mistura múltipla para caprinos e ovinos: nova fórmula dispensa adaptação.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: GALVANI, D. B.; BOMFIM, M. A. D.
Tipo: Folders
Palavras-chave: Mistura múltipla; Planejamento alimentar; Semiárido; Estação seca; Ovino; Nutrição animal; Alimento para animal; Alimentação suplementar; Suplemento alimentar; Suplemento mineral; Uréia; Sheep; Goats; Animal nutrition; Feed supplements; Animal feeding; Semiarid zones; Dry season; Urea.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1033437

Efeito da aplicação de diferentes níveis de uréia na digestibilidade da palha do feijão (Phaseolus vulgaris L.) para alimentação de ruminantes.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: ALMEIDA, G. F. de.
Verificou-se o efeito da aplicacao da ureia na palha de feijao para alimentacao de ruminantes.
Tipo: Folhetos
Palavras-chave: Palha de feijão; Ruminant; Feed; Bean straw; Produção animal; Alimentação; Animal; Digestibilidade; Ruminante; Uréia; Animal production; Digestibility; Urea.
Ano: 1992
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131441

Sal mineral com ureia para bovinos na epoca seca.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: LOPES, H. O. da S.
Tipo: Folhetos
Palavras-chave: Epoca seca; Brasil; Supplementary feeding; Alimentação mineral; Bovine; Sal mineral; Suplementação; Bovino; Cerrado; Nutrição Animal; Sais Minerais; Uréia; Suplemento Alimentar; Suplemento Energético; Animal nutrition; Dry season; Brazil; Cattle; Salts; Urea.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547878

Utilização da uréia com raspas de mandioca na alimentação de ruminantes.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: CAVALCANTI, J.; GUIMARAES FILHO, C.
A proteína é constituinte obrigatório na dieta dos ruminantes e de custo mais elevado que o componente energético. No Semiárido, no período seco a deficiência proteica da vegetação é maior que no período chuvoso, tornando-se necessário assegurar aos animais o fornecimento no período seco.
Tipo: Folhetos
Palavras-chave: Mandioca; Nutrição Animal; Ruminante; Raspa; Uréia; Animal feeding; Cassava; Animal nutrition; Ruminants; Urea.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131706

Utilização da uréia e cianamida hidrogenada na frutificação da goiabeira var. Paluma.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: GONZAGA NETO, L.; AMARAL, M. G. do; LEODIDO, J. M. C.
Dentre os diversos polos de irrigação do Brasil, a região do Submédio São Francisco tem se destacado como um dos mais promissores.
Tipo: Folhetos
Palavras-chave: Variedade Paluma; Cianamida hidrogenada; Guava; Variety; Frutification; Hydrogenated cyanamides; Goiaba; Frutificação; Uréia; Urea; Guavas.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132132

Doenças em bovinos confinados.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: BRANDINI, J. C.
Botulismo; Enterotoxemia. Dermatomicose. Dermatofilose. Timpanismo. Acidose láctica. Laminite. Intoxicação por uréia.
Tipo: Livros
Palavras-chave: Bovino de corte; Sanidade; Dermatofilose; Acidose láctea; Laminite; Diseases; Health; Bacterioses; Digestive; Disorders; Botulismo; Casco; Confinamento; Dermatomicose; Enterotoxemia; Doença; Indigestão; Intoxicação; Timpanismo; Uréia; Dermatophilus; Bloat; Beef cattle; Botulism; Dermatomycoses; Enterotoxins; Feedlots; Foot diseases; Hooves; Poisoning; Urea.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/316986

Suplementação de baixo custo para bovinos: mineral e alimentar.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: LOPES, H. O. da S.
Funcoes e sintomas de deficiencia dos minerais essenciais para bovinos; Suplementacao mineral de bovinos no pasto; Correcao das deficiencias minerais de bovinos na regiao dos cerrados; Alternativas de reducao de custos da suplementacao mineral; Formula de mistura meneral para gado de corte; Alternativas de suplementacao do gado na epoca da seca; A mandioca na alimentacao animal; Mistura Multipla; Silagem; Fenacao.
Tipo: Livros
Palavras-chave: Epoca seca; Supplementary feeding; Haymaking; Mineral deficiencies; Supplements; Bovino; Cerrado; Deficiência Mineral; Fenação; Mandioca; Nutrição Animal; Silagem; Suplemento Mineral; Uréia; Suplemento Alimentar; Animal nutrition; Cattle; Cassava; Dry season; Silage; Urea.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/544165

Cana-de-açúcar e uréia para alimentação de bovinos na época da seca.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: RODRIGUES, A. de A.; ESTEVES, S. N.
Historico sobre o uso da cana-de-acucar na alimentacao de bovinos. Fatores que afetam a qualidade da cana-de-acucar como alimento para bovinos. Informacoes para se obter bons resultados. Preparo da cana-de-acucar + ureia. Cuidados na utilizacao da cana-de-acucar + ureia. Utilizacao da cana-de-acucar na recria de novilhas. Utilizacao da cana-de-acucar + ureia para vacas em lactacao.
Tipo: Folhetos
Palavras-chave: Cana-de-açucar; Sugar cane; Saccharium officinarium; Bovine; Bovino; Lactação; Uréia; Lactation; Urea.
Ano: 1992
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/42796

Observacoes preliminares sobre a suplementacao da mistura mineral ureia para bovinos em pastejo.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: THIAGO, L. R. L. de S.; SILVA, J. M. da.
CNPGC.
Tipo: Folhetos
Palavras-chave: Suplementacao; Brasil Central; Feeding; Supplements; Fattening; Central Brazil; Bovino; Mineral; Nutrição; Pastejo; Seca; Uréia; Terminação; Cattle; Grazing; Dry season; Urea.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/321305

Adubação mineral de arroz em latossolo de campo cerrado de Roraima.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: COUTO, W. S.; CORDEIRO, A. C. C.; ALVES, A. A. C.
Tipo: Folhetos
Palavras-chave: Roraima; Brasil; Mineral nutrients; Zincsulphate; Análise Econômica; Arroz; Cloreto de Potássio; Cerrado; Nutriente Mineral; Superfosfato Triplo; Sulfato de Zinco; Uréia; Amazonia; Economic analysis; Potassium chloride; Superphosphate; Rice; Urea.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/380935

Recomendacoes tecnicas para a utilizacao da ureia pecuaria na alimentacao animal.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: LOPES, H. O. da S.; TOMICH, T. R.; GONCALVES, L. C.; BORGES, I.
Ureia pecuaria e ureia fertilizante; Metabolismo da ureia pecuaria nos ruminantes; Principais fatores que afetam a utilizacao da ureia pecuaria no rumem; Intoxicacao pela ureia pecuaria; Tratamento da intoxicacao por ureia pecuaria; Utilizacao da ureia pecuaria na alimentacao de ruminantes.
Tipo: Folhetos
Palavras-chave: Alimentacao animal; Mistura multipla; Savanna; Multiple mixture; Cerrado; Uréia; Animal feeding; Urea.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566852

Engorda de bubalinos em sistemas integrados de pastagens nativa e cultivada com suplementação de uréia.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: CAMARAO, A. P.; COSTA, N. A. da; LOURENCO JUNIOR, J. de B.; RODRIGUES FILHO, J. A.; MARQUES, J. R. F.; CASTELO BRANCO, M. V. M.
Tipo: Folhetos
Palavras-chave: Bubalino; Pastagem nativa de várzea; Suplementação; Buffalo; Fattening; Flood plain grasslands; Supplementation; Brachiaria Humidicola; Engorda; Ganho de Peso; Uréia; Urea; Weight gain.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/378506

UTILIZAÇÃO da uréia em gado leiteiro.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Equipe técnica: RODRIGUES FILHO, J. A., GONÇALVES, C. A.; AZEVEDO, G. P. C. de, CAMARÃO, A. P., VILAR, R. R. L. 1 folder.
Tipo: Folders
Palavras-chave: Nutrição Animal; Uréia; Animal nutrition; Urea.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/377246

Contribution of several nitrogen sources to growth of Alexandrium catenella during blooms in Thau lagoon, southern France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Y; Vaquer, A; Laabir, M; Abadie, Eric; Laugier, Thierry; Pastoureaud, Annie; Souchu, Philippe.
A monitoring program with a weekly sampling frequency over a 15-month period indicates that urea concentrations above a certain threshold level may trigger the blooms of Alexandrium catenella in Thau lagoon. However, urea concentrations were also sometimes related to ammonium and dissolved organic nitrogen concentrations, indicating that the role of urea may not be a direct one. An original approach is used to assess the relative contribution of several nitrogen sources (nitrate, nitrite, ammonium, urea) to growth of A. catenella by comparing nitrogen uptake rates to nitrogen-based growth rates estimated from dilution experiments during four blooms over a 4-year period (2001-2004) in Thau lagoon. Nitrate and nitrite contributed 0.1-14% and 0.1-5%...
Tipo: Text
Palavras-chave: Uptake kinetics; Ammonium; Urea; Growth; Nitrogen; HAB; Alexandrium catenella.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6454.pdf

The significance of organic nutrients in the nutrition of Pseudo-nitzschia delicatissima (Bacillariophyceae)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Loureiro, Sofia; Jauzein, Cecile; Garces, Esther; Collos, Yves; Camp, Jordi; Vaque, Dolors.
The influence of organic nutrients on the evolution of Pseudo-nitzschia delicatissima cultures was investigated in an enrichment experiment with high-molecular-weight dissolved organic matter (HMWDOM) and in an uptake assay with N-15-ammonium and N-15-urea. HMWDOM was extracted from seawater collected at a nearby shore station during the decline of a diatom bloom. Four incubations were prepared: L1/5+DOM (P. delicatissima grown in L1 growth medium with 1/5 of the nitrate concentration of standard L1), (L1-N)+DOM (L1 without nitrate, i.e. nitrogen-deficient treatment), L1-DOM (control culture without added DOM) and BV+DOM (bacterial and viral control, free of microalgae). Incubations were carried out for 10 days. Chlorophyll a concentrations differed after...
Tipo: Text
Palavras-chave: Harmful Algal Blooms (HABs); Nitrogen Uptake; Urea; Dissolved Organic Matter (DOM).
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6438.pdf

Contribution of dietary arginine to nitrogen utilisation and excretion in juvenile sea bass (Dicentrarchus labrax) fed diets differing in protein source
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tulli, F; Vachot, Christianne; Tibaldi, E; Fournier, Vincent; Kaushik, Sadasivam.
The role of dietary arginine in affecting nitrogen utilisation and excretion was studied in juvenile European sea bass (Dicentrarchus labrax) fed for 72 days with diets differing in protein sources (plant protein-based (PM) and fish-meal-based (FM)). Fish growth performance and nitrogen utilisation revealed that dietary Arg surplus was beneficial only in PM diets. Dietary Arg level significantly affected postprandial plasma urea concentrations. Hepatic arginase activity increased (P &lt; 0.05) in response to dietary Arg surplus in fish fed plant protein diets; conversely ornithine transcarbamylase activity was very low and inversely related to arginine intake. No hepatic carbamoyl phosphate synthetase III activity was detected. Dietary arginine levels did...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Sea bass; Excretion; Arginase; Urea; Arginine.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6317.pdf

Effects of pH and Nutrients (Nitrogen) on Growth and Toxin Profile of the Ciguatera-Causing Dinoflagellate Gambierdiscus polynesiensis (Dinophyceae)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Longo, Sébastien; Sibat, Manoella; Taiana Darius, Hélène; Hess, Philipp; Chinain, Mireille.
Ciguatera poisoning is a foodborne disease caused by the consumption of seafood contaminated with ciguatoxins (CTXs) produced by dinoflagellates in the genera Gambierdiscus and Fukuyoa. Ciguatera outbreaks are expected to increase worldwide with global change, in particular as a function of its main drivers, including changes in sea surface temperature, acidification, and coastal eutrophication. In French Polynesia, G. polynesiensis is regarded as the dominant source of CTXs entering the food web. The effects of pH (8.4, 8.2, and 7.9), Nitrogen:Phosphorus ratios (24N:1P vs. 48N:1P), and nitrogen source (nitrates vs. urea) on growth rate, biomass, CTX levels, and profiles were examined in four clones of G. polynesiensis at different culture age (D10, D21,...
Tipo: Text
Palavras-chave: Gambierdiscus polynesiensis; French Polynesia; Ciguatera; Ciguatoxins; LC-MS; MS; Toxin profile; Nitrate; Urea; Culture medium acidification.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77382/78981.pdf

Long-term ammonia exposure of turbot: effects on plasma parameters
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Person, Jeannine; Lamers, A; Le Roux, Annick; Severe, Armelle; Boeuf, Gilles; Mayer Gostan, N.
Turbot juveniles were exposed to four ammonia concentrations [0.17 (L), 0.34 (M), 0.73 (MH) and 0.88 (H) mgl(-1) NH3-N] for different exposure durations (28 days minimum to 84 days). Their physiological status and growth performances were compared to a control group [0.004 (C) mgl(-1) NH3-N]. No growth was observed in the H group, and by day 57, mass increase in the MH group was only 15% of that in group C. During the first month growth in the L group was similar to that in control group while it was lower (33%) in the M group; afterwards the L and M groups had a similar growth (half that of controls). Accumulation of total ammonia nitrogen (TA-N) in plasma was dependent on ambient ammonia concentrations. Plasma urea levels in ammonia-exposed fish were...
Tipo: Text
Palavras-chave: Urea; Total ammonia nitrogen; Scophthalmus maximus; Ion regulation; Cortisol; Chronic toxicity.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-618.pdf

Paramétrisation de la nutrition azotée et phosphorée d'Alexandrium catenella, microalgue toxique responsable d'efflorescences dans la lagune de Thau
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jauzein, Cecile.
In the Thau lagoon, blooms of the toxic microalgae Alexandrium catenella have induced regular losses of shellfish production since 1998 due to bioaccumulation of toxins in oysters and mussels. This thesis was conducted to enhance knowledge of toxic bloom development regulation by environmental factors, focusing on nitrogen and phosphorus nutrients influence on A. catenella growth. These works highlighted a large variety of potential nutritive sources for this species and a major part of these nutrients appeared to be potentially regenerated in the water column. Different organic sources may contribute to the growth of A. catenella from diverse nutrition processes: direct absorption through the cell membrane (for urea), enzymatic degradation in the...
Tipo: Text
Palavras-chave: Alkaline phosphatases; Mixotrophy; Phosphate; Urea; Ammonium; Uptake kinetics; Alexandrium catenella; Phosphatases alcalines; Mixotrophie; Phosphate; Urée; Ammonium; Cinétiques d'absorption; Alexandrium catenella.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/these-6511.pdf

Short-term temporal variability of ammonium and urea uptake by Alexandrium catenella (Dinophyta) in cultures
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jauzein, Cecile; Collos, Yves; Garces, E; Vila, M; Maso, M.
In batch cultures of four Mediterranean strains (from France, Italy, and Spain) of Alexandrium catenella (Whedon et Kof.) Balech growing on a daily light cycle, ammonium and urea uptake were estimated by the N-15 tracer technique. Ammonium uptake could be described by Michaelis-Menten kinetics along a substrate gradient of 0.1-10 mu gat N.L-1 for the four strains, while two different patterns were observed for urea uptake with Michaelis-Menten kinetics for one strain and linear kinetics for the others. In all cases, an increase in uptake rates with time was noted over the daylight period. This trend led to a net increase in the maximum uptake rate (V-max; for saturable kinetics) and in the initial slope alpha. For ammonium, V-max increased by a factor of...
Tipo: Text
Palavras-chave: Urea; Uptake kinetics; Temporal variability; Ammonium release; Ammonium; Alexandrium catenella.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6416.pdf

Effects on phytoplankton growth of dissolved substances produced by fish farming
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Arzul, Genevieve; Clement, Alejandro; Pinier, Anne.
Fish Farming enriches the water column in dissolved organic and inorganic material. These materials excreed by the fish, elutriate from uneaten food and derive from other polluting substances. Ratios of the organic/inorganic forms of substances (for example N and P) are thus modified. Such perturbations in turn affect phytoplankton development. From in vitro analyses and tests of water taken from a turbot rearing tank, we show the changes in seawater chemical composition produced as well as the way growth was modified in three phytoplankton species: the diatom, Chaetoceros gracile, and the dinoflagellates, Gymnodinium cf. nagasakiense and Alexandrium minutum. Elutriates from the granules used for feed (0.1 to 100 mg.l(-1)) were found to be stimulating,...
Tipo: Text
Palavras-chave: Antibiotique; Fécès; Aliment; Aquaculture; Régulation de croissance; Phytoplancton; Urée; Antibiotic; Faeces; Feed; Fish farming; Growth regulation; Phytoplankton; Urea.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00188/29887/28340.pdf

Prise simultanee de quatre sources d'azote par le microphytobenthos du chenal de Lauzieres (Charente Maritime-France) en ete
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Y.
Simultaneous uptake of nitrate, nitrite, ammonium and urea by microphytobenthos incubated in batch mode immediately after sampling do not show any kind of interactions. A linear relationship is found between nitrate uptake and ammonium uptake, the latter values being about 2 to 3 times higher than former. Ammonium uptake was not saturated by a substrate level of 10 mu M, possibly indicating diffusion limited uptake. For all nitrogen sources, the uptake rate was related to the substrate concentration rather than the oxidation state of the nitrogen compounds.
Tipo: Text
Palavras-chave: Pond culture; Interactions; Nitrogen compounds; Phytobenthos; Food conversion; Urea; Ammonium compounds; Nitrites; Nitrates.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1532.pdf

Uptake of Inorganic and Organic Nitrogen Sources by Dinophysis acuminata and D. acuta
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: García-portela, Maria; Reguera, Beatriz; Gago, Jesus; Le Gac, Mickael; Rodríguez, Francisco.
Dinoflagellate species of Dinophysis are obligate mixotrophs that require light, nutrients, and prey for sustained growth. Information about their nitrogenous nutrient preferences and their uptake kinetics are scarce. This study aimed to determine the preferred nitrogen sources in cultures of D. acuminata and D. acuta strains from the Galician Rías Baixas (NW Spain) and to compare their uptake kinetics. Well-fed versus starved cultures of D. acuminata and D. acuta were supplied with N15 labeled inorganic (nitrate, ammonium) and organic (urea) nutrients. Both species showed a preference for ammonium and urea whereas uptake of nitrate was negligible. Uptake rates by well-fed cells of D. acuminata and D. acuta were 200% and 50% higher, respectively, than by...
Tipo: Text
Palavras-chave: Dinophysis; Nitrate; Ammonium; Urea; Uptake rates; N-15 incubations; Antibiotic treatment.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00606/71770/70250.pdf

Comparison of brown trout (Salmo trutta) reared in fresh water and sea water to freshwater rainbow trout (Oncorhynchus mykiss) .1. Growth and nitrogen balance
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Dosdat, Antoine; Metailler, Robert; Desbruyeres, Elisabeth; Huelvan, Christine.
Brown trout and rainbow trout (average weight 100 g) were reared in fresh water at 12 degrees C under the same conditions before transfer of brown trout to sea water, in order to compare nitrogen utilisation in the two species. Apparent protein digestibility (ADC), nitrogen (ammonia and urea) excretion, protein productive value (PPV) and actual observed nitro en mass balance were determined. Rainbow trout raised in fresh water had a higher growth rate (1.1 vs 0.8%. d(-1)), better food conversion ratio (0.7 vs 1.0), better ADC (91 vs 85%) and PPV (45 vs 35%) and lower ammonia excretion rates than brown trout reared in fresh water. Transferring brown trout to sea water induced lower PPV (30%) and ammonia and urea excretion. Salinity did not modify metabolic...
Tipo: Text
Palavras-chave: Truite commune; Truite arc-en-ciel; Excrétion; Ammoniaque; Urée; Digestibilité; Croissance; Rétention protéique; Rainbow trout; Brown trout; Excretion; Ammonia; Urea; Digestibility; Growth; Protein productive value.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00188/29885/28342.pdf

Interactions between ammonium and urea uptake by five strains of Alexandrium catenella (Dinophyceae) in culture
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jauzein, Cecile; Loureiro, Sofia; Garces, Esther; Collos, Yves.
Short-term experiments were carried out to investigate whether interactions between ammonium (NH4+) and urea uptake regulate the total nitrogen assimilation of the toxic dinoflagellate Alexandrium catenella. To test for strain variability, 5 strains of A. catenella from the NW Mediterranean were used: 3 strains from the Thau lagoon (southern France) and 2 strains from the Catalonia basin (Spain). For each strain, the uptake rate of 1 nutrient (NH4+ or urea) at a reference concentration (10 mu gatN l(-1)) was measured as a function of the increasing concentration of the other nutrient (0 to 10 mu gatN l(-1)). Simultaneous N uptake rates of the distinct nitrogen sources were obtained from N-15-NH4+ and N-15-urea incorporation measurements. A strong...
Tipo: Text
Palavras-chave: Strain variability; Interactions; Urea; Ammonium; Alexandrium catenella.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6432.pdf

A room temperature procedure for the manual determination of urea in seawater
Provedor de dados: Open Marine Archive
Autores: Goeyens, L.; Kindermans, N.; Yusuf, M.A.; Elskens, M.
Several earlier studies underpin the important role of dissolved organic matter and more particularly urea in phytoplanktonic nitrogen uptake fluxes. Generally, the determination of urea concentrations relies on the formation of an imidazolone-thiosemicarbizide complex, a complexation which requires very accurate temperature control when carried out at high temperature. It is also possible, however, to obtain reliable results with a room temperature procedure. The measured abundances for both complexation at high temperature (85 degree C, 20 min) and at ambient temperature (22 degree C, 72 h) are closely comparable. Lower values are observed for temperatures &lt;10 degree C though. Moreover, a comparison of both techniques reveals similar precision...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dissolved organic carbon; Sea water; Temperature; Urea; Water analysis.
Ano: 1998
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7858

Injection of liquid swine slurry and effects on properties of a Nitossolo Vermelho
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Rech,Cleber; Albuquerque,Jackson Adriano; Corrêa,Juliano Corulli; Mafra,Alvaro Luiz; Bortolini,Diego.
Abstract: The objective of this work was to evaluate the superficial and injected applications of swine slurry and urea to the soil, regarding their effects on the physical properties of a Nitossolo Vermelho distroférrico under a no-tillage system. The treatments were: injected slurry into the groove with a liquid swine slurry injector (LSSI); slurry on surface, applied on the lines by the LSSI kept raised; urea injected by opening the groove with the LSSI and distributed manually; and corn, under no-tillage, as a control. Sowing and the injection of liquid slurry or urea do not modify the organic carbon content, pH, and aggregation, but alter the soil bulk density and porosity in the mobilized line, and increase the macropores.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosity; Soil structure; Urea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400518

Phosphorus utilization by corn as affected by green manure, nitrogen and phosphorus fertilizers
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Silva,Edson Cabral da; Muraoka,Takashi; Franzini,Vinícius Ide; Villanueva,Felipe Carlos Alvarez; Buzetti,Salatiér; Moreti,Dolorice.
The objective of this work was to evaluate the utilization by corn plants of P from triple superphosphate fertilizer labeled with 32P (32P‑TSP), and of P from soil as affected by N rates and by the green manures (GM) sunn hemp (Crotalaria juncea) and millet (Pennisetum glaucum). The experiment was carried out using pots filled with 5 kg Oxisol (Rhodic Hapludox). A completely randomized design was used, in a 4x4x2 factorial arrangement, with four replicates. The treatments were: four P rates as TSP (0, 0.175, 0.350, and 0.700 g P per pot); four N rates as urea (0, 0.75, 1.50, and 2.25 g N per pot); and sunn hemp or millet as green manure. The additions of N and P by the GM were taken into account. After grain physiologic maturation, corn dry matter, P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Cover crop; Isotopic dilution; Oxisol; Radioisotope; Urea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000800016

Reduction of crude protein in diets fed to lactating Holstein-Gyr cows
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Guimarães,Clóvis Ribeiro; Azevedo,Rafael Alves de; Campos,Mariana Magalhães; Machado,Fernanda Samarini; Pedroso,Alexandre Mendonça; Carvalheira,Luciano de Rezende; Tomich,Thierry Ribeiro; Pereira,Luiz Gustavo Ribeiro; Coelho,Sandra Gesteira.
Abstract: The objective of this work was to evaluate the effect of reducing crude protein (CP) contents in diets with a constant metabolizable protein content on the intake, performance, nitrogen balance, and nutrient digestibility of lactating Holstein-Gyr cows. Animals (n = 24, 103±23 days in milk) were allocated to four treatments (n = 6 per group) with different CP contents: 127, 132, 139, and 156 g kg-1 dry matter (DM). DM intake was not affected by treatments. CP intake and digestibility increased linearly with higher CP contents. Milk yield (23.7±3 kg per day) and the percentages of milk protein (3.3±0.2%) and fat (3.8±0.5%) were not affected by CP reduction. Milk and blood urea nitrogen increased linearly with the increase of CP in the diet,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Protected soybean meal; Soypass; Urea.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700858

Efecto de la concentración y fuentes de nitrógeno en la producción de proteínas de cultivos masivos de la microalga Chaetoceros muelleri
Provedor de dados: Phyton: Revista Internacional de Botánica Experimental
Autores: López-Elías,JA; González-Vega,R; Márquez-Ríos,E; Torres-Arreola,W.
Las proteínas son uno de los principales metabolitos que componen la biomasa de las microalgas que constituyen la dieta de los organismos marinos cultivados en acuacultura, ya que son imprescindibles para su crecimiento. La cantidad producida de este componente es influenciada por los nutrimentos, temperatura e intensidad luminosa, entre otros factores. En la presente investigación se evaluó el crecimiento, producción de biomasa, proteínas y patrón electroforético de las proteínas de Chaetoceros muelleri, cultivadas con dos fuentes de nitrógeno (nitratos y urea) a tres concentraciones, utilizando el medio f/2 (0,88 moles/L) (nitratos) como control. Los tratamientos fueron los medios 2f (3,53 moles/L) y 4f (7,05 moles/L) con NO3 -, y los medios f/2 (0,88...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaetoceros muelleri; Biomasa; Proteínas; Urea; Nitratos.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200010

Effects of nickel and nitrogen soil fertilization on lettuce growth and urease activity
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Oliveira,Thomas Carlos; Fontes,Renildes Lúcio Ferreira; Rezende,Sebastião Tavares de; Víctor Hugo,Alvarez V.
Nickel is a micronutrient involved in nitrogen metabolism and a constituent of the urease molecule. Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots in a 2 x 8 factorial design with two nitrogen (N) sources and eight Ni rates, with five replications. Nitrogen was applied at 200 mg dm-3 (half the dose incorporated into the soil at seedling transplanting and half top-dressed later) using the sources NH4NO3 (AN) and CO(NH2)2 (Ur). The Ni treatments (0, 2, 4, 8, 12, 16, 24 and 32 mg dm-3) were applied as NiCl2. The shoot dry-matter yield, leaf urease activity, Ni levels in the lettuce leaves and Ni levels extracted from soil with Mehlich-3 (M-3) and DTPA were determined. In the plants supplied with AN,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium nitrate; Urea; Plant nutrition; Lactuca sativa L.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300016

Emission of nitrous oxide and carbon dioxide from semi-arid tropical soils in Chiapas México
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Ponce-Mendoza,Alejandro; Ceballos-Ramírez,Juan Manuel; Gutierrez-Micelli,Federico; Dendooven,Luc.
The semi-arid region of Chiapas is dominated by N2 -fixing shrubs, e.g., Acacia angustissima. Urea-fertilized soil samples under maize were collected from areas covered and uncovered by A. angustissima in different seasons and N2O and CO2 emissions were monitored. The objective of this study was to determine the effects of urea and of the rainy and dry season on gas emissions from semi-arid soil under laboratory conditions. Urea and soil use had no effect on CO2 production. Nitrons oxide emission from soil was three times higher in the dry than in the rainy season, while urea fertilization doubled emissions. Emissions were twice as high from soil sampled under A. angustissima canopy than from arable land, but 1.2 lower than from soil sampled outside the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acacia angustissima; Denitrification; Nitrification; Soil water content; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500015

Nitrogen fertilizer use efficiency, recovery and leaching of an alexandergrass pasture
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Sartor,Laércio Ricardo; Assmann,Tangriani Simioni; Soares,André Brugnara; Adami,Paulo Fernando; Assmann,Alceu Luiz; Pitta,Christiano Santos Rocha.
Nitrogen usually determines the productive potential of forage crops, although it is highly unstable in the environment. Studies on recovery rates and use efficiency are important for more reliable fertilizer recommendations to reduce costs and avoid environmental pollution. The purpose of this study was to evaluate N use efficiency and recovery rate of Alexandergrass pasture (Brachiaria - Syn. Urochloa plantaginea) as well as N-NO3- and N-NH4+ soil concentrations using different levels of N fertilization under two grazing intensities. The experiment was arranged in a randomized block design in a factorial scheme with three replications. Treatments consisted of three N rates (0, 200 and 400 kg ha-1 N) and two grazing intensities termed low mass (LM; forage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage production; Inorganic N; Soil fertility; Urea.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300024

Nitrogen Fertilization of No-Tillage Winter Cereals in the South-Central Region of Paraná, Brazil
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Fontoura,Sandra Mara Vieira; Viero,Fernando; Moraes,Renato Paulo de; Bayer,Cimélio.
ABSTRACT High winter cereal yields depend on an adequate supply of nitrogen (N). We developed a system for indicating N rates for wheat and barley in the South-Central region of the state of Paraná, Brazil, using results of 72 field experiments conducted from 2007 to 2012. The N rates recommended for winter cereals were estimated to supply the amounts of N fertilizer needed to obtain increasing yields (&lt;3.5, 3.5-4.5, 4.5-5.5, and &gt;5.5 Mg ha-1) of crops grown after soybean and corn on soils with a variable organic matter content (&lt;40, 40-60, and &gt;60 g dm-3). The apparent mineralization rate of soil N was estimated to be 1 % and the N fertilization efficiency 50 %. The N rates recommended for wheat ranged from 30 to 150 kg ha-1 when cultivated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Hordeum vulgare L.; N indication; Urea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100533

Evaluation of ammonia volatilization losses by adjusted parameters of a logistic function
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Vale,Marcos Lima Campos do; Sousa,Rogério Oliveira de; Scivittaro,Walkyria Bueno.
The dynamics of N losses in fertilizer by ammonia volatilization is affected by several factors, making investigation of these dynamics more complex. Moreover, some features of the behavior of the variable can lead to deviation from normal distribution, making the main commonly adopted statistical strategies inadequate for data analysis. Thus, the purpose of this study was to evaluate the patterns of cumulative N losses from urea through ammonia volatilization in order to find a more adequate and detailed way of assessing the behavior of the variable. For that reason, changes in patterns of ammonia volatilization losses as a result of applying different combinations of two soil classes [Planossolo and Chernossolo (Typic Albaqualf and Vertic Argiaquolls)]...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Soil; Multivariate analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100022

Ammonia volatilization in no-till system in the south-central region of the State of Paraná, Brazil
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Fontoura,Sandra Mara Vieira; Bayer,Cimélio.
Ammonia (NH3) volatilization can reduce the efficiency of urea applied to the surface of no-till (NT) soils. Thus, the objectives of this study were to evaluate the magnitude of NH3 losses from surface-applied urea and to determine if this loss justifies the urea incorporation in soil or its substitution for other N sources under the subtropical climatic conditions of South-Central region of Paraná State, Brazil. The experiment, performed over four harvesting seasons in a clayey Hapludox followed a randomized block design with four replicates. A single dose of N (150 kg ha-1) to V5 growth stage of corn cultivated under NT system was applied and seven treatments were evaluated, including surface-applied urea, ammonium sulfate, ammonium nitrate, urea with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen fertilizer; Urea; Corn; Urease.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500020

Response of irrigated wheat cultivars to different nitrogen rates and sources
Provedor de dados: Revista Brasileira de Ciência do Solo
Autores: Teixeira Filho,Marcelo Carvalho Minhoto; Buzetti,Salatiér; Andreotti,Marcelo; Sá,Marco Eustáquio de; Arf,Orivaldo; Megda,Márcio Mohamed.
High wheat yields require good N fertilization management. The objective of this study was to evaluate the effects of different N applications at sowing using Entec (N source with nitrification inhibitor) and urea (traditional N source) at covering, on four wheat cultivars. The experiment was conducted in a randomized block design in a factorial scheme, with four replications, at the Experimental Station of the Faculdade de Engenharia de Ilha Solteira - UNESP, on a dystrophic, epi-eutrophic alic Red Latosol with loamy texture, formerly under savannah vegetation. Four N rates (0, 60, 120, and 180 kg ha-1) were tested, applied at sowing in the case of Entec and top-dressed 40 days after plant emergence in the case of urea, and the four wheat cultivars E 21,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Savannah soil; Entec; Urea; Grain yield; Yield components.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500023

Nitrogen management, cultivars and growing environments on wheat grain quality
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Silva,Raphael R.; Zucareli,Claudemir; Fonseca,Inês C. de B.; Riede,Carlos R.; Gazola,Diego.
ABSTRACT The aim of this study was to evaluate the influence of nitrogen (N) fertilization, environment and cultivars on the protein concentration, sodium dodecyl sulfate sedimentation test (SDSS) volume and falling number in wheat. The experimental design was a randomized blocks in split plot scheme with four repetions. Four wheat genotypes were evaluated under six N managements in four enviroment (subplots). The wheat genotypes evaluated were IPR Catuara TM, BRS Gaivota, Quartzo and CD 120. Protein concentration, SDS sedimentation test, falling number and grain yield were evaluated. Combined analysis of variance for the four environment was performed and means were compared by Tukey test at p ≤ 0.05. The environmental effect is greater than the genotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Grain yield; Urea; Ammonium sulfate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001100826

Single and split nitrogen dose in wheat yield indicators
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Costa,Juliane S. P.; Mantai,Rubia D.; Silva,José A. G. da; Scremin,Osmar B.; Arenhardt,Emilio G.; Lima,Andressa R. C. de.
ABSTRACT Single or split nitrogen (N) supply can maximize the expression of wheat yield indicators. The objective of the study was to evaluate the greater N use efficiency on wheat yield indicators by the single and split N supply under favorable and unfavorable year conditions to the crop in succession system of high and reduced residual N release. The study was conducted in 2014 and 2015, in a randomized complete block design with four replicates in a 4 x 3 factorial, for N-fertilizer doses (0, 30, 60, 120 kg ha-1) and supply forms [full dose (100%) in the phenological stage V3 (third expanded leaf); split dose (70 and 30%) in the phenological stages V3/V6 (third and sixth expanded leaves, respectively) and; split dose (70 and 30%) in the phenological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Urea; Residual N; Temperature; Rainfall.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100016

Canola response to nitrogen sources and split application
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Kaefer,João E.; Richart,Alfredo; Nozaki,Márcia de H.; Daga,Jacir; Campagnolo,Rodrigo; Follmann,Paulo E.
ABSTRACTThe aim of this study was to evaluate the response of the canola crop to nitrogen (N) sources and split application. The experiment was carried out in two agricultural years (2009 and 2010), at the experimental unit of the Pontifical Catholic University of Paraná - PUCPR, Campus of Toledo. A completely randomized design in 5 x 2 factorial scheme was adopted in the experiment. The treatments consisted of five split applications of N at sowing and/or as top dressing (0 and 0, 120 and 0, 0 and 120, 40 and 80, 80 and 40 kg of N ha-1) and two N sources (ammonium sulfate and urea), with four replicates. The canola genotype Hyola 61 was used in the experiment, which was evaluated for plant height, number of plants m-2, shoot dry matter, leaf area, mass of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Ammonium sulfate; Protein content; Oil content; Brassica napus L.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001101042

Nitrogen fertilization in the production of seedlings of Talisia esculenta (A. St. Hil) Radlk
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Tosta,Mauro da S.; Almeida,João P. N. de; Góes,Glêidson B. de; Freire,Priscilla de A.; Mendonça,Vander.
ABSTRACT ‘Pitombeira’ does not have organized cultivation, thus requiring information related to the production of seedlings, particularly in relation to chemical fertilizer. In this context, an experiment was conducted in order to define the best dose of nitrogen (N), using urea as N source, to be applied in ‘pitombeira’ seedlings. The experimental design was complete randomized blocks with four replicates and ten plants per plot, testing five N doses (0, 400, 800, 1.600 and 3.200 mg dm-3). Data were submitted to analysis of variance and regression. The non-destructive measurements (number of leaves, stem diameter, shoot length and the ratio between shoot length and stem diameter) were evaluated at 30, 60, 90 and 120 days after transplanting (DAT). In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ‘pitombeira’; Propagation; Urea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000700443

Nitrogen dynamics in a Latosol cultivated with coffee
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Souza,José A.; Rocha,Genelício C.; Gomes,Mateus de P.; Rezende,Carlos H. S.
ABSTRACT The objective of this study was to evaluate nitrogen losses by NH3 volatilization and quantify the upward and downward NO3- flows in Latosol cultivated with arabica coffee. An experiment was set in 2010, in Viçosa-MG, Brazil (20º 41’ S and 42º 48’ W), in a randomized block design in a (3 x 2) + 1 factorial arrangement with three nitrogen doses (200, 400 and 600 kg ha-1), two forms of urea (conventional and NBPT urease inhibitor-treated) and one additional treatment without nitrogen fertilization, with four replicates. Semi-open type chambers were installed to quantify NH3 volatilization. To determine the concentration and flow of NO3- a soil solution extractor was installed in each plot at a 1-m depth together with three tensiometers at depths of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NBPT; Urea; Nitrate flow.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600390

Production of ‘Ubá’ mango tree submitted to rejuvenation pruning and fertilized with nitrogen
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Salomão,Luiz Carlos Chamhum; Siqueira,Dalmo Lopes de; Silva,Danielle Fabíola Pereira da.
Abstract  The rejuvenation pruning or plant prune is a practice used in fruits species such mango tree, whose plants can exceed ten meters heigh, compromising the implementation of practices such as spraying and harvesting. This study aimed to evaluate the resumption of production of adult ‘Ubá’ mango trees, previously pruned and subjected to fertilization with increasing levels of nitrogen over five seasons. The experiment was conducted in Visconde do Rio Branco, MG. Nineteen years old mango trees were pruned and reduced to the primary branches, about 1.5 m above the ground. Excess shoots were removed, remaining five to six branches per tree. In the year in which the plants were pruned, the nitrogen fertilization was initiated with different doses,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Mangifera indica L.; Urea; Mineral nutrition.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000203002

Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Silva,Aurilena de Aviz; Carvalho,Almy Junior Cordeiro de; Santos,Paulo Cesar dos; Freitas,Marta Simone Mendonça; Barbosa,Roberto Rivelino do Nascimento; Beltrame,Rômulo André.
Abstract  Pineapple fruit crowns are rarely used as planting material in Brazil. However, they can be used to produce plantlet in situations of scarcity of planting material of adequate quality. The aim of this work was to evaluate the production and nutritional status of early shoots of different sizes produced from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization after the removal of its apical meristem. The experimental design adopted was that of randomized blocks in a 4x4 factorial scheme, with four nitrogen doses (5, 10, 15 and 20 g of urea per pot), four minimum shoot lengths at harvesting (10, 15, 20 and 25 cm), with four replicates. Under full sun cultivation conditions, crowns produced 18.11 and 6.83 shoots with 10 and 25 cm in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus; Plantlet; Propagation; Urea.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000301001

Application of nitrogen sources on grapevines and effect on yield and must composition
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Brunetto,Gustavo; Ceretta,Carlos Alberto; Melo,George Wellington Bastos de; Girotto,Eduardo; Ferreira,Paulo Ademar Avelar.
This study was carried out to evaluate the yield, total N content in leaves and must composition of grapes from the Cabernet Sauvignon variety subjected to the application of urea and organic compost. Cabernet Sauvignon grapevines in Rosário do Sul, RS, Brazil, in 2008, 2009 and 2010 were subjected to annual application of 40 kg N ha-1 in the form of organic compost and urea, and compared to unfertilized grapevines. In the 2008/09, 2009/10 and 2010/11 crop seasons, leaves were collected for analysis of total N content. At maturation of the grapes, the yield and quality attributes of the must were evaluated. The application of N sources, especially organic compost, increased the N content in the whole leaf at full flowering. Application of organic compost...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; Organic compost; Leaf analysis; Must quality; Vitis vinifera.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000400015

Yield, chemical composition, and efficiency of use of nitrogen by Marandu grass
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Oliveira,Tadeu Silva de; Leonel,Fernando de Paula; Pereira,José Carlos; Silva,Cássio José da; Baffa,Danielle Ferreira; Zervoudakis,Joanis Tilemahos.
The objective of this study was to evaluate the effect of five nitrogen doses on the productive and quality characteristics and the use efficiency of Brachiaria brizanthacv. Marandu grass. The treatments consisted of four doses of nitrogen (0, 60, 120, 180 and 240 kg ha-1), distributed through a completely randomized design with four replicates. Samples of the material were collected to analyze productivity variables, concentrations of neutral detergent fiber, crude protein and neutral detergent insoluble nitrogen, and in vitro dry matter digestibility. The nitrogen use efficiency, recovery of the applied nitrogen (RAN) and agronomic efficiency of the applied nitrogen (AE) were calculated. Dry mass production increased by 1,624.67 (kg/ha) as the nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen use efficiency; Nutritional characteristics; Urea.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000800440

Performance of dairy cows fed rations produced with sugarcane silages treated with additives or fresh sugarcane
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Pedroso,André de Faria; Nussio,Luiz Gustavo; Rodrigues,Armando de Andrade; Santos,Flávio Augusto Portela; Mourão,Gerson Barreto; Barioni Júnior,Waldomiro.
An experiment was performed aiming at evaluating the performance of dairy cows fed sugarcane silages treated with additives compared to cows fed fresh forage. Twenty-four Holstein cows were grouped in blocks of three cows, according to parity order and milk production level, in multiple 3 x 3 Latin Square design to evaluate three types of ration (63% roughage and 37% concentrate in dry matter - DM): ration with silage treated with urea (5.0 g/kg of fresh forage - FF) + sodium benzoate (0.5 g/kg FF); ration with silage inoculated with Lactobacillus buchneri (5 x 10(4) cfu/g FF); ration with fresh sugarcane. Each evaluation period consisted of two weeks for adaptation and one week for data collection. Cows fed rations with silages treated with urea +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed efficiency; L. Buchneri; Milk composition; Milk production; Sodium benzoate; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000900005

Chemical treatment of roughage
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Pires,Aureliano José Vieira; Carvalho,Gleidson Giordano Pinto de; Ribeiro,Leandro Sampaio Oliveira.
Chemical treatment of roughage has been the aim of studies for a long time. However, until nowadays, many questions are arisen due to the efficiency of additives used in relation to the variation of answers, either in nutritive value of treated roughage or in performance of animals feed with diet containing such roughage. This revision will approach the main and most used products, which are anhydrous ammonia, urea, sodium hydroxide and calcium oxide. It has been noticed that ammonization (both for anhydrous ammonia and urea) has presented more efficient result in animal's performance when compared with sodium hydroxide or calcium oxide. However, regarding its nutritive value, both sodium hydroxide and calcium oxide have presented a higher efficiency in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Calcium oxide; Sodium hydroxide; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300022

Chemical treatment of post-harvest Marandu grass seed residues with different moisture contents
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Roth,Marcella de Toledo Piza; Reis,Ricardo Andrade; Resende,Flávio Dutra de; Siqueira,Gustavo Rezende; Pires,Aureliano José Vieira; Bertipaglia,Liandra Maria Abaker.
The objective of this was to evaluate the effect of chemical treatments with urea (3 or 5% DM) and anhydrous ammonia (3% DM) applied to the post-harvest hay residues of Brachiaria brizantha cv. Marandu that contained different moisture contents (15, 25 or 30%). A randomized block design was used with eight treatments and four replications (defined as the bale layers within the hay stacks). The hay treated with 3% anhydrous ammonia and 15% moisture content reduced the levels of neutral detergent fiber (NDF) from 84.3 to 79.1% and increased the in vitro digestibility of the dry matter (DM) from 37.3 to 55.5% compared to the control group. The variation in the moisture content did not significantly alter the action of ammonia, with mean values of 77.6% NDF...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Carbohydrate fractionation; Nitrogen fractionation; Nutritional value; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300005

Reduction of the crude protein content of diets supplemented with essential amino acids for piglets weighing 15 to 30 kilograms
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Toledo,Juliana Beatriz; Furlan,Antonio Claudio; Pozza,Paulo Cesar; Carraro,Jocasta; Moresco,Gabriel; Ferreira,Silvia Letícia; Gallego,Adriana Gomez.
Two experiments were carried out to evaluate the reduction of crude protein (CP) in diets supplemented with synthetic amino acids for piglets of 15 to 30 kg. In the performance assay (Exp I), 60 piglets with initial weight of 15.34±0.87 kg and final weight of 30.08±1.59 kg were distributed in a randomized block design with six replicates, five treatments and two animals per experimental unit. The treatments consisted of five diets in which the CP was reduced by 1.5 percentage points, resulting in low-protein diets (19.24, 17.74, 16.24, 14.74 and 13.24%), meeting the requirements of amino acids with inclusion of L-lysine, DL-methionine, L-threonine, L-tryptophan, L-valine and L-isoleucine. The average daily gain and feed conversion according to the Linear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological value; Ideal protein; Pig; Urea.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000600301

Intake, digestibility, rumen characteristics and microbial protein synthesis efficiency in bovine and bubaline fed sugar cane silage with additives
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Maeda,Emilyn Midori; Zeoula,Lucia Maria; Jobim,Clóves Cabreira; Cecato,Ulysses; Rigolon,Luiz Paulo; Kazama,Ricardo; Jacobi,Guido; Carvalho,Acir Felipe Grolli.
Intake and total and ruminal digestibility, ruminal characteristics and microbial synthesis efficiency in bovine and bubaline fed sugar cane silages treated with microbial additive Lactobacillus buchneri (inoculate) and the addition of: cassava byproduct meal at 250 g/kg; soybean hulls at 250 g/kg; and urea at 33 g/kg, in natural matter were evaluated. The forage:concentrate ratio was 600:400 g/kg. Bubaline body weight (BW) was 403±49 kg and bovine BW was 492±10 kg. The experimental design consisted of two 4 × 4 Latin squares in a 4 × 2 factorial arrangement. The average DM intake did not differ between species, and the diet with urea showed lowest intake (13 g/kg BW). Among the diets, the one with soybean hulls addition increased the total digestibility...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacillus buchneri; Ruminal ammonia; Short chain fatty acids; Soybean hulls; Urea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300034

Impacts of limestone and nitrogen top dressing application on the potassium content in the soil profile and marandu-grass leaf concentration
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Balieiro Neto,Geraldo; Reis,Ricardo Andrade; Ruggieri,Ana Cláudia.
The objective of this experiment was to evaluate the effects of nitrogen doses (0, 100, 200, 300, and 400 kg ha-1 year-1), with or without dolomitic lime covering application, on the potassium (K) soil content at depths varying form 0 to 5, 5 to 10, and 10 to 20 cm, and the potassium concentration in the plant. The experiment was carried out in a rhodic ferralsol with a slightly rolling relief, in a 5 × 2 factorial arrangement, in a complete randomized block design, with four replications. Nitrogenated fertilization caused a linear increase in the potassium concentration in the plant and also in the mineral content in the 0-5 cm soil layer. An effect of competitive inhibition occurred between the potassium and calcium absorption, and potassium and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral nutrition; Soil fertility; Urea; Urochloa.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700002

Performance and metabolic pattern of feedlot lambs using soyabean hulls associated to different non-protein nitrogen sources
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Ziguer,Evaneo Alcides; Roll,Victor Fernando Büttow; Bermudes,Rogério Fôlha; Montagner,Paula; Pfeifer,Luiz Francisco Machado; Del Pino,Francisco Augusto Burkert; Corrêa,Marcio Nunes; Dionello,Nelson José Laurino.
The aim of this study was to evaluate the metabolic profile of the use of soyabean hulls associated with two sources of non-protein nitrogen (NPN) on the finishing of feedlot lambs. Eighty crossbred Suffolk non-castrated lambs aging 69±6 days and weighing 23.11±1.78 kg were used. Lambs were randomly allocated into 4 experimental groups according to the NPN source: conventional urea (1%); protected urea; 1% protected urea + 0.5% conventional urea; and a control group, which did not receive urea supplementation. Blood samples were collected weekly to determine the plasma concentrations of urea, albumine, γ-glutamiltransferase (GGT), calcium and phosphorus. The control group had higher average daily gain and final weight than protected urea and protected urea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemical analysis; Feeding; Performance; Urea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200030

Intake and digestibility in cattle under grazing supplemented with nitrogenous compounds during dry season
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Figueiras,Janderson Florencio; Detmann,Edenio; Paulino,Mário Fonseca; Valente,Tiago Neves Pereira; Valadares Filho,Sebastião de Campos; Lazzarini,Isis.
The objective of this work was to evaluate the effects of supplementation with nitrogenous compounds on intake and digestibility in cattle under grazing during dry season. It was used five Holstein × Zebu steers with average initial live weight of 236 kg, kept in five Brachiaria decumbens Stapf. paddocks (0.34 ha). The experiment was carried out according to a 5 × 5 Latin square design, with five supplementation levels and five experimental periods. The supplementation levels were the following: 0; 0.35; 0.70; 1.05, and 1.40 g of crude protein/kg live weight. A mixture of urea, ammonium sulfate and albumin (4.5:0.5:1.0, respectively) was used as nitrogen supplement. The average crude protein levels in the diet were 7.39; 8.92; 10.98; 12.55; and 13.62%, as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial nitrogen; Rumen ammonia nitrogen; Supplementation; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000600020

In vitro degradation of neutral detergent fiber of high-quality tropical forage according to supplementation with different nitrogenous compounds
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Zorzi,Karina; Detmann,Edenio; Queiroz,Augusto César de; Paulino,Mário Fonseca; Mantovani,Hilário Cuquetto; Bayão,Geraldo Fábio.
The objective of this work was to evaluate the in vitro degradation dynamics of neutral detergent fiber (NDF) of high-quality tropical forage according to supplementation with different nitrogenous compounds sources. A signal grass sample harvested during rainy season was used as basal forage. Casein was used as true protein source and urea:ammonium sulfate (U:AS, 9:1) mixture (urea) as non-protein nitrogen source. The first three supplements were the addition of 0.5, 1.0 and 2.0 mg of casein per mL of final incubation solution. The urea was added to the same amount of protein supplied by equivalent levels 0.5, 1.0 and 2.0 mg/mL of casein. In total, seven treatments were evaluated, including a control (only grass). The supplements were evaluated in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia nitrogen; Casein; Signal grass; Supplement; Urea.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000500025

Embryo development and follicular status of Toggenburg does fed urea diet
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Amorim,Lincoln da Silva; Torres,Ciro Alexandre Alves; Siqueira,Luiz Gustavo Bruno; Fonseca,Jeferson Ferreira da; Guimarães,José Domingos; Carvalho,Giovanni Ribeiro de; Alves,Nadja Gomes; Oliveira,Margarida Maria Nascimento Figueiredo de.
The effects of feeding urea on embryo production, quality and developmental stages and follicular status at the beginning of a superovulatory treatment of Toggenburg does fed urea diet were investigated in this study. Eighteen females were randomly allocated to receive diets with: no urea (control, n=8), and 2.4% urea dietary dry matter (n=10) UDM. The embryo recovery was performed at day 7 or 8 of estrus cycle by transcervical technique and classified according to quality and developmental stage. The follicular status was determined by transrectal ultrasonography at the first day of FSH injection. The number and quality of embryos were not affected by dietary urea concentration. Embryos from does treated with 2.4% UDM were recovered at advanced stage....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryo; Follicle; Goat; Superovulation; Urea.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200007

Fermentation parameters, quality and losses in sugarcane silages treated with chemical additives and a bacterial inoculant
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Pedroso,André de Faria; Rodrigues,Armando de Andrade; Barioni Júnior,Waldomiro; Souza,Gilberto Batista de.
The objective of this trial was to evaluate chemical additives and a bacterial inoculant on the inhibition of alcoholic fermentation and reduction of losses in sugarcane silages. Treatments were (doses on a fresh forage basis): without additive (control); urea (10 g/kg); urea (5 g/kg) + sodium benzoate (0.5 g/kg); sodium benzoate (1 g/kg); urea + ammonium sulfate in a 9:1 relation (10 g/kg); Lactobacillus buchneri (5 × 10(4) cfu/g). Silages were produced in 10.16- × 30-cm PVC tubes, provided with tight lids adapted with Bunsen valves for gas losses quantification. Minisilos were opened 139 days after ensiling. Ethanol content (227 g/kg dry matter - DM) and total DM loss (30%) were high in the control silage. All additives, except benzoate, decreased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium sulfate; Ethanol; L. buchneri; Sodium benzoate; Urea; Volatile fatty acids.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001100006

Níveis de lisina digestível em rações, utilizando-se o conceito de proteína ideal, para suínos machos castrados de alto potencial genético para deposição de carne magra na carcaça dos 60 aos 95 kg
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Abreu,Márvio Lobão Teixeira de; Donzele,Juarez Lopes; Oliveira,Rita Flávia Miranda de; Oliveira,Alexandre Luiz Siqueira de; Santos,Fabrício de Almeida; Pereira,Adriana Aparecida.
Foram utilizados 40 leitões machos castrados (peso inicial de 60,43 ± 1,56 kg e peso final de 95,66 ± 3,22 kg) de alto potencial genético para deposição de carne magra na carcaça para avaliar o efeito de níveis de lisina digestível, utilizando-se o conceito de proteína ideal, sobre o desempenho e as características de carcaça. Os animais foram distribuídos em delineamento de blocos ao acaso, com quatro tratamentos, cinco repetições e dois animais por unidade experimental. Os tratamentos consistiram de uma ração basal com 16,48% de PB, suplementada com L-lisina HCL, resultando em rações com 0,70; 0,80; 0,90 e 1,00% de lisina digestível. As rações foram suplementadas com níveis crescentes de aminoácidos sintéticos, resultando em rações com relações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Carcass; Finishing phase; Genotype; Urea.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007000100007

Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Sampaio,Cláudia Batista; Detmann,Edenio; Lazzarini,Isis; Souza,Marjorrie Augusto de; Paulino,Mário Fonseca; Valadares Filho,Sebastião de Campos.
The aim of this work was to evaluate the effects of supplementation with nitrogenous compounds on rumen dynamics of neutral detergent fiber (NDF) in cattle fed low-quality tropical forage. Five crossbred heifers with average live weight of 180 kg and fitted with rumen cannulae were used. The animals were fed ad libitum with signal grass (Brachiaria decumbens Stapf.) hay, which had crude protein (CP) content of 4.86% of dry matter (DM). The five treatments were proposed in order to raise the CP level of diets to 0, 2, 4, 6, and 8 percentile points above the CP level of the forage. The supplement was a mixture of urea, ammonium sulfate, and albumin (4.5:0.5:1.0, respectively). The experiment was carried out according to a 5 × 5 Latin square design, with five...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rumen degradation; Rumen fill; Signal grass; Supplementation; Urea.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000300023

Effects of dietary energy and nitrogen supplements on rumen fermentation and protozoa population in buffalo and zebu cattle
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Franzolin,Raul; Rosales,Fabrício Pini; Soares,Weber Vilas Bôas.
The effects were assessed of two energy sources in concentrate (ground grain corn vs. citrus pulp) and two nitrogen sources (soybean meal vs. urea) on rumen metabolism in four buffaloes and four zebu cattle (Nellore) with rumen cannula and fed in a 4 × 4 Latin square design with feeds containing 60% sugar cane. Energy supplements had no effect on the rumen ammonia concentration in cattle, but ground grain corn promoted higher ammonia level than citrus pulp in buffalo. Urea produced higher ammonia level than soybean meal in both animal species. On average, the buffaloes maintained a lower rumen ammonia concentration (11.7 mg/dL) than the cattle (14.5 mg/dL). Buffaloes had lower production of acetic acid than cattle (58.7 vs. 61.6 mol/100 mol) and higher of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus pulp; Rumen metabolism; Sugar cane; Urea; Volatile fatty acids.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300014

Ammonia volatilization from nitrogen fertilizers applied to sugarcane straw
Provedor de dados: Revista Ciência Agronômica (RCA)
Autores: Otto,Rafael; Zavaschi,Eduardo; Souza Netto,Gerson José Marquesi de; Machado,Bianca de Almeida; Mira,Acácio Bezerra de.
ABSTRACT Maintenance of crop residues over soil surface under conservational systems limits incorporation of nitrogen fertilizers into the soil. Application of urea over crop residues enhance N-NH3 volatilization losses, justifying the usage of urease inhibitors or N sources less susceptible to volatilization under such conditions. This study aimed to evaluate volatilization losses from N sources applied over sugarcane straw. A field trial was carried out in a sugarcane field in Iracemapolis, Sao Paulo on a Typic Kandiudox in June 2014. We used a complete block experimental design, with seven treatments and four replications. Treatments included Control [CO], ammonium nitrate [AN], NS30TM (ammonium nitrate-75% and ammonium sulfate-25% fused mixture)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urea; NBPT; NS 30 TM; Green cane.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300413

CARTOGRAFÍA DE LAS PÉRDIDAS POTENCIALES DE N-UREA POR VOLATILIZACIÓN EN SUELOS DE CHILE CENTRAL
Provedor de dados: Revista de la Ciencia del Suelo y Nutrición Vegetal
Autores: Casanova P,Manuel; Benavides Z,Carlos.
Empleando información cartográfica y una base de datos se predijo la distribución espacial de la volatilización a partir de urea granular aplicada superficialmente en la zona central de Chile, bajo el supuesto que el potencial de pérdida amoniacal sólo depende de las propiedades del suelo, y que se asocian al espacio físico conocido como micrositio. Las propiedades relevantes (capacidad de intercambio catiónico, actividad ureásica, tamponamiento del pH y pH del suelo post-hidrólisis de la urea o pH/) para el proceso de pérdida de amoníaco, se definieron acorde a un modelo conceptual, determinándose que los valores umbrales para un alto potencial de pérdidas son: CIC &amp;#8804; 20 cmol(+) kg-1, actividad ureásica &amp;#8805; 40 N-urea g-1 h-1 and pH...
Tipo: Journal article
Palavras-chave: Funciones de pedotransferencia; Urea; Volatilización.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000100002

UREASE ACTIVITY AND NITROGEN MINERALIZATION KINETICS AS AFFECTED BY TEMPERATURE AND UREA INPUT RATE IN SOUTHERN CHILEAN ANDISOLS
Provedor de dados: Revista de la Ciencia del Suelo y Nutrición Vegetal
Autores: Cartes,Paula; Jara,Alejandra A; Demanet,Rolando; Mora,María de la Luz.
Incubation studies were carried out to evaluate the effect of temperature and urea supply level on both the urease activity and the kinetics of N mineralization in two Andisols of Southern Chile. Our results showed that urease activity was higher in Piedras Negras soil (PNS) than Freiré soil (FS) at 24 and 48 h, and the enzyme was activated when the temperature increased from 5 to 21 °C. Urease activity followed a simple Michaelis-Menten kinetics. In PNS, the Michaelis Menten constant (Km) decreased, whereas the maximum enzyme reaction velocity (Vmax) and the catalytic efficiency increased when the temperature was raised up to 21 °C at 24 and 48 h of soil incubation. In FS, urease activity was the highest at 24 h, and it decreased at 48 h as a consequence...
Tipo: Journal article
Palavras-chave: Urease activity; N mineralization; Urea; Andisols.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000100006

Stalk yield and technological attributes of planted cane as related to nitrogen fertilization
Provedor de dados: Scientia Agricola
Autores: Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Carlos Eduardo,Faroni; Vitti,André Cesar; Otto,Rafael.
A still unclear question related to sugarcane cropping refers to the low response of the planted cane to nitrogen fertilization. Two experiments were carried out in areas under a Typic Hapludox, located in Pirassununga, São Paulo State, Brazil, and an Arenic Kandiudult, located in Jaboticabal, São Paulo State, Brazil, with the objective to evaluate planted cane response to nitrogen fertilization at planting. The experimental design was organized as random blocks and treatments consisted of three N rates (40, 80, and 120 kg ha-1 N-urea) and a control without N. Nitrogen fertilizers were applied to the bottom of the planting furrow and then incorporated into the soil. During the maximum growth stage, +1 leaf samples were collected from all experimental plots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500012

Soil organic matter as a function of nitrogen fertilization in crop successions
Provedor de dados: Scientia Agricola
Autores: Yagi,Renato; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Barbosa,José Carlos; Araújo,Luiz Alberto Navarro de.
The interdependence between the C and N cycles is reflected by the levels of soil organic matter (SOM). SOM and organic C levels in water soluble (C-WS) humic acids (C-HA), fulvic acids (C-FA), and humin fractions (C-H) were evaluated through the classic chemical fractionation method in samples of a Rhodic Eutrudox from a randomized blocks experimental design, with split-split-plots using five nitrogen sidedressing levels for corn (0; 60; 120; 180; and 240 kg ha-1 N) as the main treatment, two crop sequences (corn-corn and soybean-corn) as the secondary treatment, and two sampling depths (0 to 0.2 and 0.2 to 0.4 m) as a sub-subtreatment. Nitrogen fertilization did not affect SOM levels, but favored the synthesis of substances in the C-HA fraction. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic acids; Humin; Urea; Corn; Soybean.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400011

Contribution of nitrogen from sugarcane harvest residues and urea for crop nutrition
Provedor de dados: Scientia Agricola
Autores: Fortes,Caio; Vitti,André Cesar; Otto,Rafael; Ferreira,Danilo Alves; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze.
Sugarcane (Saccharum spp.) harvested without burning provides a substantial amount of remains (trash) on soil profiles which can be decomposed and release nutrients contributing to reduce fertilizer needs. The contribution of nitrogen (N) from sugarcane plant residues and fertilizer in sugarcane nutrition was assessed. Plant cane treatments were micro plots of 15N-labeled urea, sugarcane trash and root system; the last two to simulate the previous crop residues incorporated into the soil after crop renewal. For ratoons, N-ammonium nitrate (N-AN) micro plots, 150 kg ha-1 of N-AN and control (0 kg ha-1) were set up to evaluate the contribution of trash in N supply and quantify the effects of N-fertilizer on N-trash mineralization. The N balances derived from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; 15N isotope; N balance; Urea; Straw; Roots and rhizomes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500005

Cloning of putative ureG genes from Glomus intraradices and urease activities in tobacco arbuscular mycorrhizal roots
Provedor de dados: Scientia Agricola
Autores: Takahashi,Daniele; Ditt,Renata Fava; Lambais,Marcio R.
Even though the major benefit of arbuscular mycorrhizae is the increased uptake of phosphate from the soil solution and translocation to the plant, changes in the activity of enzymes involved in nitrogen (N) metabolism have been detected in mycorrhizal roots. Using differential display of reverse-transcripts of tobacco roots not-inoculated or inoculated with Glomus intraradices (Gi), we have cloned two partial cDNAs (NtGi2 and NtGi3). The presence of a conserved CobW/HypB/UreG domain and phylogenetic analyses suggest that NtGi2 and NtGi3 encode isoforms of urease accessory protein G (ureG) highly similar to ureG from fungi. The steady state levels of the putative ureG transcripts were shown to be higher in roots colonized by Gi, as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nicotiana tabacum; DDRT-PCR; Arbuscular mycorrhiza; Urea; Ammonium sulfate; Nitrogen.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200016

Rates and methods of applying urea to common beans
Provedor de dados: Scientia Agricola
Autores: Kiehl,J.C.; Silveira,R.I.; Brito Neto,J.
The effect of rate and method of urea application on the yield of common beans (Phaseolus vulgaris L., cv. IPA-1) was evaluated on a Red-Yellow Latosol (Psamentic Haplortox) of Arapiraca and on a Solodic Planosol (Ustalf) of Igaci, both sandy-clay-loams located in the State of Alagoas, Brazil. Rates of 30,60 and 90 kg N/ha were applied placing the urea totally in the furrow at planting time; totally sidedressed twenty days after planting, mixed or not with the soil; or 1/3 of the amount in the furrow at planting plus 2/3 sidedressed twenty days after planting, mixed or not with the soil. Bean yield responses to nitrogen followed quadratic equations. In the Red-Yellow Latosol response to nitrogen occurred up to the rate of 66 kg N/ha, while in the Solodic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bean; Urea; Nitrogen; Method of application.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200013

Residual recovery and yield performance of nitrogen fertilizer applied at sugarcane planting
Provedor de dados: Scientia Agricola
Autores: Franco,Henrique Coutinho Junqueira; Otto,Rafael; Vitti,André Cesar; Faroni,Carlos Eduardo; Oliveira,Emídio Cantídio de Almeida; Fortes,Caio; Ferreira,Danilo Alves; Kölln,Oriel Tiago; Garside,Alan Leslie; Trivelin,Paulo Cesar Ocheuze.
ABSTRACTThe low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum; Urea; Nitrogen fertilization; Isotopic technique.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600528

การศึกษาการเพิ่มระดับโปรตีนของกากมะพร้าวสดและแห้ง โดยกระบวนการหมักยีสต์และยูเรีย
Provedor de dados: Thai Agricultural Research Repository
Autores: Narumon Somkuna; Jarous Sawangtap; Jiraprapa Rodjarkken; Surasak Uttarawichian.
The objective of this study was to compare the increasing protein level of fresh and dry coconut meal by urea-yeast (Saccharomyces cerevisiae) fermentation process. The design was 2 X 8 factorial in CRD : factor A composed of 2 factors (dry and fresh coconut meal) and factor B composed of 8 factors (day of fermentation: 5, 10, 15, 20, 25, 30, 35 and 40 days). The samples of each day of fermentation were collected for crude protein analysis. The data was analyzed by using Analysis of Variance (ANOVA). The results were shown that the protein level at the different days of fermentation was different in fresh and dry coconut meal (P&lt;0.05) which protein level of fresh coconut meal at day 10 was highest (34.40 %). While protein level in dry coconut meal was...
Tipo: PhysicalObject
Palavras-chave: Fresh coconut meal; Dry coconut meal; Coconut copra; Kernel meal; Fermentation process; Yeast; Saccharomyces cerevisiae; Urea; Animal feed; Crude protein level; กากมะพร้าวสด; กากมะพร้าวแห้ง; มะพร้าว; กระบวนการหมัก; ยีสต์; ยูเรีย; ระยะเวลาหมัก; อาหารสัตว์; โปรตีนหยาบ; การเพิ่มโปรตีน; ระดับโปรตีน.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5742

Cumulative effects of urea and ammonium sulfate on the fourth-year corn grown on reddish brown lateritic soil
Provedor de dados: Thai Agricultural Research Repository
Autores: Amnat Suwanarit; Chairerk Suwannarat; Sodsai Changsaluk.
1 table
Palavras-chave: Corn; Maize; Yields; Urea; Ammonium sulfate; Reddish brown lateritic soil; Cumulative effect; ข้าวโพด; การเจริญเติบโต; ปุ๋ยยูเรีย; แอมโมเนียมซัลเฟต; ดินสีแดงชุดปากช่อง.
Ano: 1989
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4353

ผลของซัลเฟตและยูเรียต่อการผลิตก๊าซมีเทนในดินนาภายใต้สภาพการบ่มดินในห้องปฏิบัติการ
Provedor de dados: Thai Agricultural Research Repository
Autores: Patcharee Senjaen; Sophoanrith Ro; Thepparit Tulaphitak.
Methane is one of important greenhouse gases emitted from submerged paddy soil under anaerobic condition. The objective of the present experiment was to study the influence of sulfate and urea on methane production in paddy soil. Four rates of sulfate (0, 50, 100 and 210 kg SO42- ha-1) were set up by using ammonium phosphate (16-20-0, 42 % sulfate) with the amount of N, P2O5 and K2O for each treatment being balanced by using urea, rock phosphate and potassium chloride. In addition, soil without urea application was prepared. All soils were incubated in bottles for 21 days in oxygen-free nitrogen ambient. Result showed that there is a linear relationship with negative correlation between methane production in soil and sulfate contents. The soil without urea...
Tipo: Collection
Palavras-chave: Methane; Paddy soil; Sulfate; Urea; Soil incubation; ก๊าซมีเทน; ดินนา; ซัลเฟต; ยูเรีย; การบ่มดิน; ปุ๋ยแอมโมเนียมฟอสเฟต.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5283

Cumulative effects of urea and ammonium sulfate on corn grown in second year on reddish brown lateritic soil
Provedor de dados: Thai Agricultural Research Repository
Autores: Amnat Suwanarit; Sodsai Changsaluk.
2 ill.
Palavras-chave: Corn; Maize; Growth; Urea; Ammonium sulphate; Reddish brown lateritic soil; ข้าวโพด; การเจริญเติบโต; ปุ๋ยยูเรีย; อะลูมิเนียมซัลเฟต; ดินชุดปากช่องสีแดง.
Ano: 1987
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4249

Comparative effects of urea and ammonium sulfate on maize grown on reddish brown lateritic soil
Provedor de dados: Thai Agricultural Research Repository
Autores: Amnat Suwanarit; Chairerk Suwannarat; Traisuda Waitruadrok.
Palavras-chave: Corn; Maize; Corn growth stage; Urea; Ammonium sulfate; Lateritic soil; ข้าวโพด; การเจริญเติบโต; ปุ๋ย; ยูเรีย; อะลูมิเนียมซัลเฟต; ดินชุดปากช่องสีแดง.
Ano: 1986
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4398