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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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Can tropical grasses grown as cover crops improve soil phosphorus availability?
AU - Almeida, D.S.
AU - Menezes-Blackburn, D.
AU - Rocha, K.F.
AU - de Souza, M.
AU - Zhang, H.
AU - Haygarth, P.M.
AU - Rosolem, C.A.
N1 - 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.
PY - 2018/9
Y1 - 2018/9
N2 - 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
AB - 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
KW - cover crops
KW - Megathyrsus maximus
KW - organic phosphorus
KW - phosphorus pools
KW - Urochloa brizantha
KW - Urochloa ruziziensis
KW - Panicum maximum
KW - Poaceae
U2 - 10.1111/sum.12439
DO - 10.1111/sum.12439
M3 - Journal article
VL - 34
SP - 316
EP - 325
JO - Soil Use and Management
JF - Soil Use and Management
SN - 0266-0032
IS - 3
ER -