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| Registros recuperados: 425 | |
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| Longphuirt, Sorcha Ni; Lim, Jae-hyun; Leynaert, Aude; Claquin, Pascal; Choy, Eun-jung; Kang, Chang Keun; An, Shu. |
| The importance of intertidal flats as areas of nitrogen filtering has become increasingly apparent in recent times. TO understand fully the cycling of this nutrient. in these areas of high metabolic activity, it is necessary to elucidate the influence of microphytobenthos (MPB) on stocks of ammonium and nitrate in surface areas. In this study, we aimed to quantity nitrogen uptake and relate it to the in Situ concentrations and environmental conditions to which MPB are exposed. In an estuarine system on the Korean Peninsula, we conducted kinetic experiments using N-15 stable isotopes and core sampling over the tidal cycle to determine the temporal evolution of porewater nutrient concentrations and the migration of MPB. The results revealed a range of K-s... |
| Tipo: Text |
Palavras-chave: N 15 stable isotope; Porewater; Microphytobenthos; Kinetic; Nitrogen. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6622.pdf |
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| Godoy,Roberto; Haneke,Jörgen; Staelens,Jeroen; Oyarzún,Carlos; Paulino,Leandro; Barrientos,Mónica. |
| The growth of intensive livestock farming in the central depression of southern Chile (40° S) during the last century has resulted in elevated emissions of inorganic nitrogen (N) compounds into the atmosphere, particularly of NH3. Consequently, atmospheric N has been deposited to lakes, vegetation, and soil. Much attention has been paid to wet N deposition in southern Chile, while almost nothing is known about dry N deposition in this region. Our aim is to use an exploratory approach with SAM (Standard Air Monitoring) filters to investigate the potential contribution of the dry N deposition to the total N deposition in the central depression of southern Chile. Furthermore, the relationship between micro-climatological patterns and dry deposition was... |
| Tipo: Journal article |
Palavras-chave: Atmospheric deposition; Nitrogen; Nothofagus obliqua forest; Pinus radiata plantation; Surrogate surface. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200006 |
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| Dupas,Elisângela; Buzetti,Salatiér; Sarto,André Luis; Hernandez,Fernando Braz Tangerino; Bergamaschine,Antonio Fernando. |
| The aim of this study was to evaluate dry matter yield and nutritional value of palisade grass (Brachiaria brizantha cv. Marandu) using nitrogen doses and sprinkler irrigation in two periods of the year, aiming at reducing seasonality of forage production. It was used a randomized block design in a split-plot scheme, with five doses of nitrogen (0, 50, 100, 150, and 200 kg/ha/cut), and the sub-plots were defined by the seasons of the year (wet and dry season), with and without irrigation. During the wet season, in the plots with and without irrigation, doses of 175 and 161 kg/ha/cut promoted the highest dry matter yields. During the dry season, 171 kg ha-1N with irrigation resulted in the highest dry matter yield. During the same season, there was no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; Nitrogen; Pasture. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200006 |
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| Carmona,Felipe de Campos; Anghinoni,Ibanor; Cao,Eduardo Giacomelli. |
| Rice in Rio Grande do Sul State is grown mostly under flooding, which induces a series of chemical, physical and biological changes in the root environment. These changes, combined with the presence of rice plants, affect the availability of exchangeable ammonium (NH4+) and pH of soil solution, whereas the dynamics of both variables can be influenced by soil salinity, a common problem in the coastal region. This study was conducted to evaluate the dynamics of exchangeable NH4+ and pH in the soil solution, and their relation in the solution of Albaqualf soils with different salinity levels, under rice. Four field experiments were conducted with soils with exchangeable Na percentage (ESP) of 5.6, 9.0, 21.2, and 32.7 %. Prior to flooding, soil solution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen; Acidity; Exchangeable sodium percentage. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200009 |
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| SILVA, M. A. da; MILLAR, A. A.; OLIVEIRA, C. A. V.; MARTINS, C. E.; BANDEIRA, R. E.; NASCIMENTO, T.. |
| A exploracao da cultura do milho, no Nordeste brasileiro, e feita geralmente sob condicoes de dependencia de chuva. Neste trabalho, estudou-se o efeito da lamina de irrigacao, conteudo de agua no solo, adubacao nitrogenada e interacao entre esses fatores na producao de graos de milho. Verificou-se que a aplicacao de agua e nitrogenio causaram efeito linear, aumentando a producao de graos de milho, dentro dos limites estudados e analisados. |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Fertilizer applications; Maiz; Irrigação; Adubação; Fertilidade; Nitrogênio; Milho; Solo; Zea Mays; Irrigation; Nitrogen; Soil. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133333 |
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| MAY, A.; SANTOS, F. C. dos; SANTOS, M. de S. dos; SILVA, M. A. da; BARRETA, V. Z.. |
| O objetivo do trabalho foi avaliar a produtividade da cana-de-açúcar transplantada em sistema de plantio direto após o cultivo do sorgo biomassa, em função de doses de nitrogênio aplicadas no plantio. O delineamento experimental utilizado foi em blocos ao acaso, com três repetições. Os tratamentos consistiram de quatro doses de nitrogênio (0, 20, 40 e 60 kg ha-1). A variedade de cana-de-açúcar utilizada foi a IAC SP 911099, transplantada em sistema de plantio direto após o cultivo do sorgo biomassa BRS 716. As parcelas experimentais foram compostas de quatro linhas de 12 m de comprimento, com espaçamento entrelinhas de 1,0 m. As variáveis avaliadas foram produtividade de colmos e brix na massa de caldo. Houve elevação da produtividade de colmos de... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Fertilidade do solo; Nitrogênio; Plantio direto; Soil fertility; Nitrogen. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1055940 |
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| SILVA, M. A. da; MILLAR, A. A.; COELHO, M. B.; OLIVEIRA, C. A. V.; BANDEIRA, R. E.; NASCIMENTO, T.. |
| Neste trabalho estudou-se o efeito do nivel de agua no solo e da adubacao nitrogenada, e interacao entre estes fatores, sobre a producao e componentes de producao de graos de milheto. O delineamento do experimento foi em blocos casualizados, com arranjos em parcelas subdivididas (split-plot) com quatro repeticoes. Os tratamentos constaram de combinacao de quatro niveis de agua e quatro niveis de fertilizacao nitrogenada. O regime de irrigacao caracterizado em termos de aplicacao de agua, teor de umidade de solo, agua disponivel no solo e potencial matricial de agua no solo, aumentou a producao de graos. Observou-se que a eficiencia foi o que o mesmo foi superior a 40%, 18% e 8% a dos tratamentos com aplicacoes de 0,40 e 80 kg/ha de nitrogenio. O milheto e... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Penninsetum typhoides; Millet; Fertilizer applications; Irrigação; Adubação; Fertilidade; Milheto; Nitrogênio; Solo; Irrigation; Nitrogen; Soil. |
| Ano: 1981 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133332 |
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| Giampaoli,Patricia; Santos,Daniela Soares dos; Mollo,Luciana; Kanashiro,Shoey; Tavares,Armando Reis. |
| ABSTRACT The aim of this study was to evaluate the effect of urea fertiliser on the bromeliad, Aechmea fasciata. Plants were submitted to weekly treatments with a solution of 0.0, 0.5, 1.0, 1.5 or 2.0 g urea L-1. After 210 days of the experiment, biometric variables of growth and development of the root and shoot systems were analysed, together with foliar levels of chlorophyll a and b, and of carotenoids. The experimental design was of randomised blocks with four replications; eight plants were used per plot. The data were submitted to regression analysis. The highest values for chlorophyll a and carotenoid content were obtained at a concentration of 1.23 g L-1 urea, and for chlorophyll b at a concentration 1.75 g L-1 urea. Plants of A. fasciata submitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bromeliaceae; Nitrogen; Mineral nutrition; Chlorophyll. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000400657 |
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| Kubota,Aki; Hoshiba,Kent; Bordon,Jorge. |
| Nitrogen removal in soybean grains at harvest may exceed biological N2 fixation, particularly if grain yields are as high as typically achieved on "Terra Rossa" soils of Eastern Paraguay. Applying N fertilizer or coating seeds with rhizobial inoculants that enhance nodulation may represent a way of balancing the N budget. However, the effects of such treatments appear to be highly site-specific. The objective of this study was to examine the effects of N application (N) and rhizobial inoculation (I) on nodulation, N accumulation and soybean yields in Eastern Paraguay. Field experiments were conducted in two consecutive soybean seasons. Dry conditions in the first year delayed sowing and reduced plant number m-2 and pod number plant-1. Grain yields were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Inoculum; Nitrogen; Nodulation; Rhizobium. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000400027 |
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| Berton Junior,João Francisco; Santos,Julio Cesar Pires; Coelho,Cileide Maria Medeiros; Klauberg Filho,Osmar. |
| The objective of this work was to evaluate the efficiency of nitrogen fixing inoculum associated with Co + Mo leaf spray on the common bean grain yield and grain nutrients, cv. FT Nobre. Three dosages of the inoculant (0, 200 and 400 g/50 kg seeds), combined with four Co + Mo leaf spray levels (T0=0,0; T1=4.9,49; T2=7.3,73; and T3=9.7,97 g ha-1 of Co and Mo, respectively) were tested. The grain yield with the use of the inoculant (400 g / 5O kg seed-1) associated with the higher level of Co+Mo (T2 and T3) was very similar to the mineral nitrogen condition fertilizer recommended for the bean (70 kg ha-1 of N). With the increased inoculant dosage, an increase of the protein content and of P and Mg in the grain was also observed. The results indicated that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seed quality; Phosphorus; Magnesium; Nitrogen. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600002 |
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| Registros recuperados: 425 | |
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