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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Can tropical grasses grown as cover crops improve soil phosphorus availability?

Texto completo
Autor(es):
Almeida, D. S. [1] ; Menezes-Blackburn, D. [2, 3] ; Rocha, K. F. [1] ; de Souza, M. [1] ; Zhang, H. [2] ; Haygarth, P. M. [2] ; Rosolem, C. A. [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ, Dept Crop Sci, BR-18610307 Botucatu, SP - Brazil
[2] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ - England
[3] Sultan Qaboos Univ, Dept Soils Water & Agr Engn, POB 34, Al Khod 123, Muscat - Oman
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: SOIL USE AND MANAGEMENT; v. 34, n. 3, p. 316-325, SEP 2018.
Citações Web of Science: 1
Resumo

Tropical grasses grown as cover crops can mobilize phosphorus (P) in soil and have been suggested as a tool to increase soil P cycling and bioavailability. The objective of this study was to evaluate the effect of tropical grasses on soil P dynamics, lability, desorption kinetics and bioavailability to soya bean, specifically to test the hypothesis that introducing grass species in the cropping system may affect soil P availability and soya bean development according to soil P concentration. Three grass species, ruzi grass (Urochloa ruziziensis), palisade grass (Urochloa brizantha) and Guinea grass (Megathyrsus maximus), were grown in soils with contrasting P status. Soya bean was grown after grasses to assess soil P bioavailability. Hedley P fractionation, microbial biomass P, phytase-labile P and the diffusive gradient in thin films were determined, before and after cultivation. It was found that grasses remobilized soil P, reducing the concentration of recalcitrant P forms. The effect of grasses on changing the P desorption kinetics parameters did not directly explain the observed variation on P bioavailability to soya bean. Grasses and microorganisms solubilize recalcitrant organic P (P-o) forms and tropical grasses grown as cover crops increased P bioavailability to soya bean mainly due to the supply of P by decomposition of grass residues in low-P soil. However, no clear advantages in soya bean P nutrition were observed when in rotation with these grasses in high-P soil. This study indicates that further advantages in soya bean P nutrition after tropical grasses may be impeded by phytate, which is not readily available to plants. (AU)

Processo FAPESP: 15/04200-0 - Conservação do fósforo em sistemas de produção agrícola
Beneficiário:Ciro Antonio Rosolem
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 14/23707-5 - Disponibilidade de fósforo e produtividade de soja em rotação com braquiária ruziziensis
Beneficiário:Danilo Silva Almeida
Linha de fomento: Bolsas no Brasil - Doutorado