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| Registros recuperados: 449 | |
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| NASCENTE,Adriano Stephan; KROMOCARDI,Ruby. |
| ABSTRACT The upland rice farmers in Suriname use local varieties and low level technologies in the field. As a result, the upland rice grain yield is low, at about 1 000 kg ha-1. Our objective was to evaluate the use of upland rice cultivars from Suriname and Brazil, and the effect of nitrogen, N, phosphorus, P, and potassium, K, fertilizers on cultivation variables. We undertook four field trials in the Victoria Area, in the Brokopondo District, using a randomized block design each with four replications. The most productive rice varieties were BRS Esmeralda (grain yield 2 903 kg ha-1) and BRS Sertaneja (2 802 kg ha-1). The highest grain yield of 2 620 kg ha-1 was achieved with a top dressing application of 76.41 kg N ha-1 20 days after sowing. For P, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa L.; Rice varieties; Nitrogen; Phosphorus; Potassium. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000300185 |
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| PEDROTTI,Fabiola; MAGNOTTI,Caio; STERZELECKI,Fabio; CERQUEIRA,Vinicius. |
| ABSTRACT The present study aimed to evaluate nitrate acute toxicity in cultured common snook Centropomus undecimalis juveniles. Fish (20.35±6.10 g and 13.90±1.75 cm) were submitted to a control treatment (without nitrate addition) plus 20 increasing concentrations of nitrate up to 2735 mg L-1 obtained by sodium nitrate. System was semi-static, with 100 % daily water renewed and sodium nitrate addition to maintain the respective concentrations. Water temperature was 20.99±0.55 °C, dissolved oxygen 6.79±0.21 mg L-1, pH 8.23±0.10, alkalinity 141.80±7.68 mg L-1 CaCO3, salinity 33.47±3.75 g L-1, total ammonia and nitrite less than 1 mg L-1. During experimental period (96 h), no mortalities were observed in fish with or without nitrate addition. Compared to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Centropomidae; Marine fish; Nitrogen. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2018000300304 |
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| SANTOS SILVA,Bruna; MELLO PRADO,Renato de; CALERO HURTADO,Alexander; APARECIDA DE ANDRADE,Renata; PEREIRA DA SILVA,Gilmara. |
| ABSTRACT High ammonia (NH4 +) concentration can exert stress on many plants, which causes nutritional disorders and reduction on plant growth. However, depending on the intensity of the stress, it may be attenuated by silicon. In this work, the response of impact of cations and silicon accumulations and plant growth in cultivated papaya plants was investigated under different toxic ammonia concentrations regardless of the presence of silicon (Si). The experiment was conducted at the Universidade Estadual Paulista (UNESP) with papaya seedlings, variety 'Grupo Formosa' (Calimosa híbrida 01), grown in a glass greenhouse, in 1.7 dm3 pots filled with pine and coconut fiber-based substrate. The experimental design was a randomized block design, in a 5 x 2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya; Biomass; Phytotoxicity; Nitrogen; Nutrients. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000300345 |
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| Perfeto,Paulo Nelo Medeiros. |
| In Grateloupia doryphora and Gymnogongrus griffithsiae the seasonal variation of their chemical compounds was studied, establishing a relation with the physical and chemical properties of seawater. High values of proteins in the studied species were detected during the winter, 28.88% in G. doryphora and 26.68% in G. griffithsiae, corresponding to the maximum period of ammonium concentration in the marine environment. The variation in carbohydrates content showed an inverse relation with the proteins, with a maximum of 54.72% in G. doryphora and of 55.36% in G. griffithsiae, both in summer, positively correlated with salinity and temperature of sea water. Lipids content was low in both species. In G. doryphora the values ranged between 0.81 and 1.30% and,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Proteins; Carbohidrates; Lipids; Ashes; Nitrogen; Phosphorus; Potassium. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061998000100006 |
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| Luz, Pedro henrique Cerqueira; USP; Herling, Valdo Rodrigues; USP; Braga, Gustavo José; APTA; Nogueira Filho, José Carlos Machado; USP; Faria, Letícia de Abreu; USP; Lima, César Gonçalves de; USP. |
| O objetivo do estudo foi avaliar os efeitos da adubação nitrogenada e da irrigação por aspersão no crescimento e na produção de massa seca (MS) da aveia preta (Avena strigosa, Schreb). Foram avaliadas quatro doses de nitrogênio (0, 50, 100 e 150 kg de N ha-1) e também a presença ou ausência de irrigação. Foram determinadas as seguintes variáveis: altura de planta, produção de massa seca, taxa de crescimento e o teor de MS. Quando irrigada, a altura da planta foi maior, refletindo maior produção de massa seca. Na área de sequeiro, o teor de MS foi superior (24,7%) ao da área irrigada (18,7%). Quanto à adubação nitrogenada, houve resposta somente para altura de planta, com comportamento linear, quando da utilização de irrigação. Os efeitos da irrigação foram... |
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Palavras-chave: 5.01.00.00-9 Agronomia altura de planta; Nitrogênio; Produção de massa seca 5.01.03.00-8 Fitotecnia height of plant; Nitrogen; Dry matter yield. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3555 |
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| Oliveira, Kathia Szeuczuk de; Mendes, Marcelo Cruz; Ilibrante, Gustavo Arruda; Antoniazzi, Noemir; Stadler, Alan Junior; Antoniazzi, Ana Paula. |
| The aim of this study was to evaluate the effect of nitrogen fertilization with and without humic acid in barley cultivars on the export of nitrogen, phosphorus and potassium grains. The experiment was performed in the city of Guarapuava, PR, during the 2015 and 2016 growing seasons. The experimental design was in RCB in factorial 5 x 2, with the following sowing fertilization (kg ha-1): 0, 100 NPK, 100 NPK+HS, 250 NPK, 250 NPK+HS and two cultivars, BRS Brau and BRS Elis. The dose of 250 kg NPK with humic substance increased the nitrogen export to barley grains, with the highest levels occurring in the BRS Brau cultivar under favorable climatic conditions. Under favorable climatic conditions, the export of phosphorus to barley grains in the agricultural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hordeum vulgare; NPK fertilizer; Nitrogen; Phosphorus; Potassium.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42690 |
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| Brum, Marcos da Silva; Cunha, Vinícius Dos Santos; Stecca, Jéssica Deolinda Leivas; Grando, Luiz Fernando Teleken; Martin, Thomas Newton. |
| The objective of this study was to evaluate the agronomic characteristics of corn seed inoculated with Azospirillum brasilense, grown on black oat and ryegrass straw, and managed under different grazing strategies and doses of nitrogen. The experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, during two agricultural seasons (2012/2013 and 2013/2014) in a randomized, complete block design with three replications. In the winter period, black oat and ryegrass straw were managed at different grazing heights by sheep (0.30, 0.20, 0.10 m, conventional grazing, and no grazing) with three doses of nitrogen (0, 50, and 100 kg ha-1, with or without inoculation by A. brasilense). We used the hybrid Pioneer (P1630H®) in 2012 and the hybrid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.00.00-9 Zea mays; Grazing heights; Biological nitrogen fixation; Nitrogen; Integrated systems. Fitotecnia. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30664 |
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| Lacerda, Mábio Chrisley; Nascente, Adriano Stephan. |
| This study aimed to evaluate the effect of row spacing and nitrogen topdressing fertilization of two materials (genotype 07SEQCL441 CL and cultivar BRS Esmeralda) on the plant height, yield components, grain yield, and quality of an upland rice crop grown in a no-tillage system. Trials were conducted for two growing seasons under field conditions in a 3 x 4 factorial, randomized, complete block design, with four replications. For each material, treatments consisted of the combination of row spacing (0.225, 0.35, and 0.45 m) with nitrogen (N) applied as topdressing (0, 50, 100, and 150 kg ha-1). The lowest row spacing (0.225 m) for genotypes 07SEQCL441 CL and BRS Esmeralda provided a higher number of tillers, number of panicles m-2, and grain yield of rice.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agronomia; Fitotecnia; Cultivares Oryza sativa L.; Nitrogen; Plant population; NTS; Cerrado fitotecnia. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30855 |
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| Ferreira, Alexandre Cunha de Barcellos; Borin, Ana Luiza Dias Coelho; Lamas, Fernando Mendes; Bogiani, Julio Cesar; Silva, Mellissa Ananias Soler da; Silva Filho, Joao Luis da; Staut, Luiz Alberto. |
| Sustainable production systems, such as the no-tillage system (NTS), have a tendency to increase organic carbon in the soil. However, in Brazilian cotton production, the conventional tillage system (CTS) is predominant, and long-term studies on cotton crop under the NTS are scarce. The present study aimed to evaluate the effect of soil management and crop rotation systems on the cotton fiber yield as well as on the carbon and nitrogen accumulation in the soil. This study was conducted in the Brazilian savanna over 9 years and consisted of the following four treatments with different soil management systems: the NTS and CTS with the succession or rotation of crops (cotton, soybean, maize, and Urochloa ruziziensis). The NTS increased the carbon content by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; No-tillage; Conventional tillage; Nitrogen; Carbon stock; 5.01.01.06-4. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/43039 |
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| Oliveira, Kathia Szeuczuk de; Mendes, Marcelo Cruz; Ilibrante, Gustavo Arruda; Antoniazzi, Noemir; Stadler, Alan Junior; Antoniazzi, Ana Paula. |
| The aim of this study was to evaluate the effect of nitrogen fertilization with and without humic acid in barley cultivars on the export of nitrogen, phosphorus and potassium grains. The experiment was performed in the city of Guarapuava, PR, during the 2015 and 2016 growing seasons. The experimental design was in RCB in factorial 5 x 2, with the following sowing fertilization (kg ha-1): 0, 100 NPK, 100 NPK+HS, 250 NPK, 250 NPK+HS and two cultivars, BRS Brau and BRS Elis. The dose of 250 kg NPK with humic substance increased the nitrogen export to barley grains, with the highest levels occurring in the BRS Brau cultivar under favorable climatic conditions. Under favorable climatic conditions, the export of phosphorus to barley grains in the agricultural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hordeum vulgare; NPK fertilizer; Nitrogen; Phosphorus; Potassium.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42690 |
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| Silva, Maria Anita Gonçalves da; UEM; Porto, Simone Maria Altoé; UEM; Mannigel, Anny Rosi; UEM; Muniz, Antonio Saraiva; UEM; Mata, José de Deus Viana da; UEM; Marchetti, Marlene Estevão; UEM. |
| A aveia preta é responsiva à adubação nitrogenada, a qual propicia aumento de biomassa e acúmulo de N, o qual poderá ser aproveitado pelo milho em sucessão. O trabalho foi realizado em Campo Mourão, Estado do Paraná, e teve como objetivo avaliar a resposta da aveia à adubação nitrogenada e a produtividade do milho cultivado em sucessão. Os tratamentos consistiram na aplicação de nitrogênio (120 kg há-1), tendo como fonte o sulfato de amônio, como a seguir: T1: (24-90-30); T2 (0-90-30); T3 (144-0-0); T4: (0-0-0), onde a adubação foi feita respectivamente na semeadura da aveia preta (SA), em pré-semeadura do milho, na aveia dessecada (PS) e na semeadura do milho (SM). No tratamento 1, a aveia recebeu somente a adubação nitrogenada na semeadura (24 kg há-1) e... |
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Palavras-chave: 5.01.00.00-9 Agronomia rotação de cultura; Nitrogênio; Zea mays crop rotation; Nitrogen; Zea mays. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/740 |
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| Silva, Francisca Alcivania de Melo; UNESP; Villas Boas, Roberto Lyra; UNESP; Silva, Reginaldo Barboza; UNESP. |
| Os objetivos deste trabalho foram avaliar a produção de alface em ambiente protegido, utilizando diferentes compostos orgânicos como fonte de nitrogênio, e seu efeito residual em dois ciclos sucessivos. O experimento foi conduzido entre os meses de fevereiro e maio de 2005, em casa-de-vegetação com ventilação e temperatura controlados, utilizando vasos de 3,5 L e solo classificado como Latossolo Vermelho Escuro. Foram utilizados compostos orgânicos produzidos a partir da mistura de resíduos do processamento de quatro plantas medicinais e esterco bovino. Os compostos C1, C2, C3 e C4 nas doses 30, 60, 90 e 120 t há-1 constituíram os tratamentos dispostos em delineamento inteiramente casualizado, com quatro repetições e uma testemunha (adicional). Foram... |
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Palavras-chave: 5.01.00.00-9 Agronomia Lactuca sativa L.; Adubação orgânica; Nitrogênio; Efeito residual 5.01.01.05-6 Fertilidade do Solo e Adubação Lactuca sativa L.; Organic fertilization; Nitrogen; Residual effect. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1340 |
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| Detomini, Euro Roberto; USP; Massignan, Luiz Fernando Druzina; USP; Libardi, Paulo Leonel; USP; Dourado Neto, Durval; USP. |
| O objetivo deste trabalho é caracterizar o consumo hídrico do genótipo DKB 390 em condições adequadas de irrigação, tanto para situações de suprimento suficiente quanto para subótimo de nitrogênio. Valores de coeficiente de cultura são também apresentados para diferentes fases, para o primeiro caso, no intuito de prover subsídios teóricos para orçamento de água à cultura e para o manejo da irrigação durante o ciclo. Um experimento de campo foi conduzido durante a estação principal de cultivo, avaliando-se biomassa, área foliar, umidade do solo, dados climatológicos e transmitância de luz, permitindo derivar o balanço hídrico, o consumo hídrico e a eficiência de uso da água. O genótipo mencionado requer por volta de 600 mm para a obtenção de elevadas... |
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Palavras-chave: 5.01.00.00-9 Agronomia Zea mays; Evapotranspiração; Nitrogênio; Biomassa; KC; Milho Zea mays; Evapotranspiration; Nitrogen; Biomass; Kc; Maize. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/379 |
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| Bezerra, Roseane Madeira; Costa, Fernando Guilherme Perazzo; Givisiez, Patrícia Emília Naves; Goulart, Cláudia Castro; Santos, Renato Andrade dos; Lima, Matheus Ramalho. |
| With the objective of evaluating the effect of reducing crude protein (CP) and L-glutamic acid supplementation, Dekalb Brown laying hens with 34 weeks of age. The birds were distributed in six treatments in a completely randomized design, eight replications of eight birds. The control diet contained 17% CP. The second and third treatments had CP reduced by 1.5 and 3.0 percentage points (pp) of CP in relation to the control diet, respectively. In the fourth treatment, was added the same amount of glutamate of the control diet (2.982%), and the last two treatments was added 1 and 2 pp of glutamate in relation to control diet (3.982 and 4.98%), respectively. The treatment with 15.17% CP + 0.341% L-glutamic acid (T4) promoted higher egg production, and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.04.00.00-2 egg production; Nitrogen; Performance; Uric acid.. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/25911 |
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| Pereira, Adriana Aparecida; Junqueira, Otto Mack; Griep Junior, Dirceu Neutzling; Lima Júnior, Dorgival Morais de; Sgavioli, Sarah; Morais, Socorro. |
| The aim of this study was to evaluate the action of the phytase enzyme in diets formulated with variations in the crude protein content on performance and egg quality of commercial layers. A total of 336 commercial layers were housed at eight birds per cage in a 3 × 2 factorial arrangement with seven replicates. Treatments consisted of four crude-protein levels (17, 15, and 13%) and two enzyme levels (0 and 500 FTU kg-1 diet), distributed in a completely randomized design. Feed intake, egg production, feed conversion per dozen eggs and per kilogram, egg weight and mass, specific gravity, eggshell thickness, and Haugh unit were measured over five 28-day periods. The performance of commercial layers fed the diet containing 13% crude protein worsened,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphorus; Chicken; Nitrogen; Eggs.. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33097 |
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| Branco, Antonio Ferriani; Universidade Estadual de Maringá; Viana, Keila Bianchin; Universidade Estadual de Maringá; Castañeda, Román David; Universidade Estadual de Maringá; Prohmann, Paulo Emilio; Universidade Estadual de Maringá; Coneglian, Sabrina Marcantonio; Universidade Estadual de Maringá; Mouro, Gisele Fernanda; Universidade Estadual de Maringá. |
| The objective of this study work was to assess crude protein fractions in structural components (leaves, stem and dead material) of Coastcross grass (Cynodon dactylon (L.) Pers) under grazing, on winter, spring and summer seasons, in the Northwestern of Paraná, South of Brazil. Were determined CP, NDF, ADF contents and protein fractions, A, B1, B2, B3 and C. The analysis of CP showed great differences among months, but there was no difference among seasons. NDF and ADF in the stem were lower (p < 0.05) during the spring. The season did not affect (p > 0.05) protein fractions A, B1, B2, B3 and C of leaves. However, it was observed that the highest proportions of CP were B3 and A fractions. For the stem, the most important crude protein... |
| Tipo: Pesquisa de campo ; análise laboratorial |
Palavras-chave: 5.04.00.00-2 e 5.04.03.00-1 seasons; Nitrogen; Ruminants; CNCPS. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10895 |
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| Registros recuperados: 449 | |
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