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  • ALMEIDA D.S. - Can tropical grasses grown as cover crops improve soil P availability

    Rights statement: This is the peer reviewed version of the following article: Almeida, D. S., Menezes‐Blackburn, D. , Rocha, K. F., Souza, M. , Zhang, H. , Haygarth, P. M. and Rosolem, C. A. (2018), Can tropical grasses grown as cover crops improve soil phosphorus availability?. Soil Use Manage, 34: 316-325. doi:10.1111/sum.12439 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1111/sum.12439 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>09/2018
<mark>Journal</mark>Soil Use and Management
Issue number3
Volume34
Number of pages10
Pages (from-to)316-325
Publication statusPublished
Early online date21/09/18
Original languageEnglish

Abstract

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 (Po) 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. © 2018 British Society of Soil Science

Bibliographic note

This is the peer reviewed version of the following article: Almeida, D. S., Menezes‐Blackburn, D. , Rocha, K. F., Souza, M. , Zhang, H. , Haygarth, P. M. and Rosolem, C. A. (2018), Can tropical grasses grown as cover crops improve soil phosphorus availability?. Soil Use Manage, 34: 316-325. doi:10.1111/sum.12439 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1111/sum.12439 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.