| Texto completo | |
| Autor(es): |
Gotz, Lenir Fatima
;
Alves, Elton Eduardo Novais
;
Hurtarte, Luis Carlos Colocho
;
Condron, Leo Murtagh
;
Vergutz, Leonardus
;
Hill, Stefan
;
de Sousa, Djalma Martinhao Gomes
;
de Almeida, Adila Natalia Franca
;
Nunes, Rafael de Souza
;
Pavinato, Paulo Sergio
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SOIL & TILLAGE RESEARCH; v. 256, p. 12-pg., 2025-09-18. |
| Resumo | |
This study used a combination of analytical techniques - chemical fractionation, XANES and 31P NMR spectroscopies - to investigate and quantify the effects of different long-term tillage practices [conventional tillage (CT) with plowing at 20 cm-depth and harrowing, and no-tillage (NT) systems] and phosphate fertilizer inputs (triple superphosphate-TSP and Gafsa reactive phosphate rock-RPR applied in the sowing furrow or broadcast) on the nature and bioavailability of phosphorus (P) in the topsoil (0-20 cm) of a strongly weathered Oxisol in Brazil. The soil was sampled after 17 years of phosphate application (35 kg ha-1 yr-1) and after eight years of maize (Zea mays L.) cropping without P input. Results showed that soil legacy P accumulated from P inputs was mainly present as non-labile inorganic P adsorbed on iron (P-Fe) and aluminum (P-Al) oxides (average of 79 %). Accumulation of soil legacy P in labile pool was greater under NT (65 mg kg- 1) compared with CT (32 mg kg- 1), while organic P as monoester and diester was also greater in soil maintained under NT than CT (81 vs 61 mg kg-1). Maize grown after cessation of P inputs mobilized and depleted both labile (average of -8 mg kg-1) and non-labile (average of -47 mg kg-1) pools of legacy P. Calcium-bound P acted as labile reserve of P, especially when RPR was applied under NT, while P-Fe and P-Al were less available to maize, increasing their proportion under P suppression. Long-term tillage and phosphate fertilization strategies influence the bioavailability of legacy P in tropical soil, and conservation systems enhance the potential for crops to access and utilize the legacy P reserves. (AU) | |
| Processo FAPESP: | 20/09593-8 - Variação temporal na dinâmica do fósforo sob distintos manejos do solo e dos fertilizantes fosfatados |
| Beneficiário: | Lenir Fátima Gotz |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 22/07795-8 - Efeitos do manejo do solo, fertilizantes fosfatados e adubação verde no fósforo orgânico |
| Beneficiário: | Lenir Fátima Gotz |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |