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| Gatiboni,Luciano Colpo; Brunetto,Gustavo; Rheinheimer,Danilo dos Santos; Kaminski,João; Pandolfo,Carla Maria; Veiga,Milton; Flores,Alex Fabiani Claro; Lima,Maria Angélica Silveira; Girotto,Eduardo; Copetti,André Carlos Cruz. |
| Long-standing applications of mineral fertilizers or types of organic wastes such as manure can cause phosphorus (P) accumulation and changes in the accumulated P forms in the soil. The objective of this research was to evaluate the forms of P accumulated in soils treated with mineral fertilizer or different types of manure in a long-term experiment. Soil was sampled from the 0-5 cm layer of plots fertilized with five different nutrient sources for nine years: 1) control without fertilizer; 2) mineral fertilizer at recommended rates for local conditions; 3) 5 t ha-1 year-1 of moist poultry litter; 4) 60 m³ ha-1 year-1 of liquid cattle manure and 5) 40 m³ ha-1 year-1 of liquid swine manure. The 31P-NMR spectra of soil extracts detected the following P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycerophosphate; Manure; Phytate; Organic phosphorus; Organic fertilization. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000300010 |
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| Pellegrini,João Batista Rossetto; Santos,Danilo Rheinheimer do; Gonçalves,Celso Silva; Copetti,André Carlos Cruz; Bortoluzzi,Edson Campanhola. |
| A avaliação do teor de P total e solúvel nas águas superficiais é insuficiente para o diagnóstico do seu potencial poluidor. O objetivo deste trabalho foi avaliar as frações de P e as propriedades relacionadas com a liberação de P de sedimentos erodidos de unidades paisagísticas com diferentes graus de ação antrópica. As amostragens de água+sedimentos foram realizadas em duas unidades paisagísticas de uma sub-bacia da pequena bacia hidrográfica do Arroio Lino, Agudo, RS, Brasil. Avaliaram-se pH, concentração de sedimentos, C orgânico total, granulometria, Fe extraído por DCB (Fe d) e oxalato (Fe ox), P solúvel (Ps), P total (Pt), P particulado biodisponível (Ppb), P particulado potencialmente biodisponível (Pppb) e teor de fosfato dessorvido com água... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacia hidrográfica; Uso do solo; Qualidade de água; Ata ciliar. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000700005 |
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| Copetti,André Carlos Cruz; Silva,Leandro Souza da; Drescher,Gerson Laerson; Müller,Eduardo Augusto; Busanello,Rafael Lago; Vieira,Frederico Costa Beber. |
| Among the greenhouse gases, nitrous oxide (N2O) is considered important, in view of a global warming potential 296 times greater than that of carbon dioxide (CO2) and its dynamics strongly depend on the availability of C and mineral N in the soil. The understanding of the factors that define emissions is essential to develop mitigation strategies. This study evaluated the dynamics of N2O emissions after the application of different rice straw amounts and nitrate levels in soil solution. Pots containing soil treated with sodium nitrate rates (0, 50 and 100 g kg-1 of NO−3-N) and rice straw levels (0, 5 and 10 Mg ha-1), i.e., nine treatments, were subjected to anaerobic conditions. The results showed that N2O emissions were increased by the addition of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Greenhouse effect flooded soils; Electrochemical characteristics. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200458 |
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