| Full text | |
| Author(s): |
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]
Total Authors: 7
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | SOIL USE AND MANAGEMENT; v. 34, n. 3, p. 316-325, SEP 2018. |
| Web of Science Citations: | 1 |
| 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 (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) | |
| FAPESP's process: | 14/23707-5 - Availability of phosphorus and soybean yield in crop rotation with Congo grass |
| Grantee: | Danilo Silva Almeida |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 15/04200-0 - Phosphorus conservation in cropping systems |
| Grantee: | Ciro Antonio Rosolem |
| Support Opportunities: | Regular Research Grants |