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| Registros recuperados: 425 | |
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| Barbarick, K.A.; Ippolito, J.A.; McDaniel, J.P.. |
| Understanding N dynamics in biosolids-amended agroecosystems can help avoid over-application and the potential for environmental degradation. We investigated 15-years of biosolids application to dryland-wheat, questioning what is the relationship between cumulative grain yield and N uptake (N removal) and biosolids or N fertilizer rates and how many times biosolids or N fertilizer are applied? How are wheat-grain production and N uptake intertwined with residual soil nitrate-N? We found that biosolids or N fertilizer rates plus the number of applications of each material produced planar-regression (3-dimensional) models with 15-years of grain yield and N uptake data (all R2 > 0.93). To evaluate how yield or N uptake impacted residual soil nitrate-N, we... |
| Tipo: Article |
Palavras-chave: Dryland crops; Small grain; Nitrogen; Soil quality. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1404/1/1374.pdf |
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| Belloni, Bruno; Sartoretto, Stephane; Cresson, Pierre; Bouchoucha, Marc; Guillou, Gael; Lebreton, Benoit; Ruitton, Sandrine; Harmelin-vivien, Mireille. |
| The coralligenous ecosystem is one of the biodiversity hotspots in the Mediterranean Sea. This study aims at determining (i) the organic matter (OM) sources at the base of the food web in a coralligenous ecosystem near Marseille (Cap Caveau, Frioul Island) and (ii) the global functional structure of its community. For that purpose, C and N stable isotope analyses were performed on 78 compartments or species collected in this habitat between 30 and 40 m depth. Results suggested that the pelagic particulate organic matter (POM), mainly composed of phytoplankton, was the main OM source fuelling coralligenous food webs, followed by sedimented organic matter (SOM) and some macrophytes. At least three level of consumers were identified from... |
| Tipo: Text |
Palavras-chave: Food webs; Coralligenous ecosystem; Stable isotopes; Carbon; Nitrogen. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00483/59511/62396.pdf |
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| Souza,Leandro de P.; Nobre,Reginaldo G.; Silva,Evandro M. da; Lima,Geovani S. de; Pinheiro,Francisco W. A.; Almeida,Luana L. de S.. |
| ABSTRACT The objective of this research was to evaluate the growth and formation of fresh and dry weight of ‘Crioula’ guava rootstock irrigated with waters of different saline levels and nitrogen (N) doses, in an experiment conducted in plastic tubes under greenhouse conditions. The experimental design was randomized blocks, in a 5 x 4 factorial scheme with four replicates, and the treatments consisted of five levels of water electrical conductivity - ECw (0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four N doses (70, 100, 130 and 160% of the N dose recommended for the cultivation of guava seedlings, cv. ‘Paluma’). The dose referring to 100% corresponds to 773 mg of N dm-3. The highest growth of ‘Crioula’ guava rootstock was obtained with ECw of 0.3 dS m-1 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psidium guajava L.; Water electrical conductivity; Nitrogen. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800739 |
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| Miranda,João M. de S.; Cavalcante,Ítalo H. L.; Oliveira,Inez V. de M.; Lopes,Paulo R. C.; Assis,Joston S. de. |
| ABSTRACTThe production of high quality fruits is a necessary factor for the adaptation and production of plant species with economic viability. Thus, an experiment was conducted from July 2012 to January 2013 to evaluate the fruit quality of the ‘Eva’ and ‘Princesa’ apple cultivars as a function of nitrogen fertilization in Petrolina, PE, Brazil. The experimental design consisted of randomized blocks, with treatments distributed in a factorial arrangement 2 x 4, corresponding to apple cultivars (Eva and Princesa) and nitrogen doses (40; 80; 120 and 160 kg of N ha-1), with four replications and three plants in each plot. The fruit characteristics, such as fruit mass, skin color (luminosity, chromaticity, and colour angle), size (width and length), pulp... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malus domestica; Nitrogen; Post-harvest. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001000967 |
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| Brunetto,Gustavo; Cella,Cesar; Miotto,Alcione; Girotto,Eduardo; Lorensini,Felipe; Brackmann,Auri; Ceretta,Carlos Alberto; Schorr,Márcio Renan Weber; Both,Vanderlei; Ambrosini,Vítor Gabriel. |
| ABSTRACT: Little is known about the impact of N fertilization on fruit production and composition in orange groves grown in soils with low or medium organic matter content in Rio Grande do Sul (RS). This study aimed to evaluate how N fertilization of orange trees cv. 'Lane Late' in a sandy soil may interfere in fruit yield and composition of fruit and juice. The experiment was conducted with orange trees cv. 'Lane Late' growing in Sandy Typic Hapludalf soil, in Rosário do Sul (RS). The plants received applications of 0, 20, 40, 60, 80, 100, 120, 140 and 160kg N ha-1. Total N in leaves, number of fruits per plant, yield, fresh weight, fruit diameter, peel thickness, percentage of fruit juice, peel color, juice color, ascorbic acid content, total soluble... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Leaf analysis; Fruit quality; Citrus sinensis L. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300253 |
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| Putti,Fernando F.; Kummer,Ana C. B.; Grassi Filho,Helio; Gabriel Filho,Luís R. A.; Cremasco,Camila P.. |
| ABSTRACT: This study aimed to evaluate the effects of fertilization with composted sewage sludge and irrigation with drinking water (DW) and fertigation with wastewater (WW) in wheat crop using fuzzy rule-based system. The experiment was conducted in the Department of Soil and Environmental Resources, of FCA, UNESP - Botucatu, with factorial 6 × 2, which were applied 6 doses of sewage sludge (0, 50, 100, 150, 200 and 250% of nitrogen recommendation) and two types of effluents (treated water and sewage). In the developing of the system based in fuzzy rules, it was used the Mamdani inference method, where the input variables were sewage sludge doses and water types and the output variables used were the number of tillers, length and number spike per plant;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sustainability; Nitrogen; Mamdani; Fuzzy system. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601103 |
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| de Queiroz, Genilson Fernandes; Matera, Julia Maria. |
| Objective: To disclose the technique, equipment, mechanism of action, indications, advantages and disadvantages, complication and/or after-effects of cryosurgery in treatment of lesions. Data Sources: Data search was carried out in data base systems of CAB and MEDLINE over a 30-year term. Data Synthesis: Cryosurgery consists of the treatment of lesions through freezing (liquid nitrogen at -196° C).It has been used in medicine for the treatment of skin, liver, kidneys, prostate and oral cavity neoplasias. In. veterinary medicine it is still not broadly known and literature lacks information as to its application. It is an easily performed procedure, requiring however knowledge of the technique, of indications and possible complications and after-effects.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cryogenic surgery; Cryotherapy; Freezing techniques; Hyperthermia induced; Cryogenics; Nitrogen; Neoplasms; Pets Criocirugía. Crioterapia. Congelamiento; Hipotermia inducida; Criogénicos; Nitrógeno; Neoplasmas; Animales domésticos criocirurgia; Crioterapia; Congelamento; Hipotermia induzida; Criogênicos; Nitrogênio; Neoplasias; Animais domésticos. |
| Ano: 2003 |
URL: http://www.revistamvez-crmvsp.com.br/index.php/recmvz/article/view/3258 |
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| Granada,Camille E; Strochein,Marcos; Vargas,Luciano K; Bruxel,Manuela; Sá,Enilson Luiz Saccol de; Passaglia,Luciane M.P. |
| This work aimed to evaluate the symbiotic compatibility and nodulation efficiency of rhizobia isolated from Desmodium incanum, Lotus corniculatus, L. subbiflorus, L. uliginosus and L. glaber plants by cross-inoculation. Twelve reference strains and 21 native isolates of rhizobia were genetically analyzed by the BOX-PCR technique, which showed a high genetic diversity among the rhizobia studied. The isolates were also characterized based on their production of indolic compounds and siderophores, as well as on their tolerance to salinity. Fifteen of the 33 rhizobia analyzed were able to produce indolic compounds, whereas 13 produced siderophores. All the tested rhizobia were sensitive to high salinity, although some were able to grow in solutions of up to 2%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhizobia; Nodulation; Nitrogen; Specificity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000300012 |
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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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| 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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| Silva,Paulo Regis Ferreira da; Strieder,Mércio Luiz; Coser,Rúbia Patrícia da Silva; Rambo,Lisandro; Sangoi,Luís; Argenta,Gilber; Forsthofer,Everton Leonardo; Silva,Adriano Alves da. |
| Physiological changes incorporated into current maize hybrids suggest the occurrence of modifications in the nitrogen uptake dynamics, improving plant ability to uptake N during grain filling. This may justify late N side-dressing whenever environmental constraints prevent adequate nitrogen supply during crops vegetative development. This study evaluates effects of nitrogen fertilization at booting and silking on grain yield and kernel crude protein contents of commercial maize hybrids. Two experiments were set up in Eldorado do Sul, RS, during the 2001/2002 and 2002/2003 growing seasons. In 2001/2002, treatments were composed of two hybrids (Agroceres 303 and Pioneer 32R21), three nitrogen rates applied during maize vegetative development (30, 80 and 130... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Nitrogen; Fertilization timing; Productivity. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500014 |
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| Núñez,Pedro; Demanet,Rolando; Matus,Francisco; Mora,Maria de la Luz. |
| The grazing management of grassland has a direct effect on nitrogen (N) recycling. This is an important reason why management has become an alternative to improve the grassland production and quality, in turn to make it more suitable for the environment. However, the livestock system intensification induces changes in the natural dynamics of the N cycle, accelerating gas emmisions (e.g. ammonia, NH3 and nitrous oxide, N(2)0) and leaching losses from soil under grazing. When the amount of N in the environment increases, there is an impact on smog episodes, global warming, stratospheric ozone depletion, acid rain and eutrophication of fresh water. There are different techniques to evaluate the gases emitted from the soil. This klonowledge is useful to design... |
| Tipo: Journal article |
Palavras-chave: Ammonia; Grazing; Management; Nitrogen; Nitrous oxide; Livestock. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912007000300006 |
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| Registros recuperados: 425 | |
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