Data/hora: 13/06/2024 04:42:47

Provedor de dados: | Revista Brasileira de Ciência do Solo
País: | Brazil
Título: | Congo grass grown in rotation with soybean affects phosphorus bound to soil carbon
Autores: | Merlin,Alexandre; He,Zhenli L.; Rosolem,Ciro Antonio.
Data: | 2014-06-01
Ano: | 2014
Palavras-chave: | Crop rotation; No-till; Organic P; Phosphorus fractionation.
Resumo: | The phosphorus supply to crops in tropical soils is deficient due to its somewhat insoluble nature in soil, and addition of P fertilizers has been necessary to achieve high yields. The objective of this study was to examine the mechanisms through which a cover crop (Congo grass - Brachiaria ruziziensis) in rotation with soybean can enhance soil and fertilizer P availability using long-term field trials and laboratory chemical fractionation approaches. The experimental field had been cropped to soybean in rotation with several species under no-till for six years. An application rate of no P or 240 kg ha-1 of P2O5 had been applied as triple superphosphate or as Arad rock phosphate. In April 2009, once more 0.0 or 80.0 kg ha-1 of P2O5 was applied to the same plots when Congo grass was planted. In November 2009, after Congo grass desiccation, soil samples were taken from the 0-5 and 5-10 cm depth layer and soil P was fractionated. Soil-available P increased to the depth of 10 cm through growing Congo grass when P fertilizers were applied. The C:P ratio was also increased by the cover crop. Congo grass cultivation increased P content in the soil humic fraction to the depth of 10 cm. Congo grass increases soil P availability by preventing fertilizer from being adsorbed and by increasing soil organic P.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300020
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832014000300020
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.38 n.3 2014
Fonte: | info:eu-repo/semantics/openAccess