Chemical and spectroscopic evaluations supporting superior P availability after biochar-P fertilizer application

Autor(es)

Borges, Bernardo M. M. N. ; Barreto, Matheus Sampaio C. ; Pavinato, Paulo S. ; Teles, Ana Paula B. ; Strauss, Mathias ; Abdala, Dalton B. ; Leandro, C. Barbosa ; Alves, Priscila C. ; Franco, Henrique C. J.

• Tipo de documento: Artigo Científico
• Fonte: SOIL & TILLAGE RESEARCH; v. 223, p. 8-pg., 2022-07-20.

Resumo

Sustainable agriculture intensification requires optimization of agriculture resources such as new fertilizers with higher nutrient use efficiency. Biochar has been a promisor alternative not only as a P source but also as a matrix to host P fertilizer to improve its use efficiency by intrinsic features. In our previous work, biochar enriched with P lead to higher sugarcane biomass yield and P use efficiency than conventional P fertilizer in a greenhouse trial, however, the effects of biochar enriched with P in the fate of available-P were not plenty understood. In this work, we investigated the superior P availability after fast-pyrolysis biochar-P fertilizer (BioFert) over the incubation time of 240 days in three distinct soils (sandy, loamy and clayey), evaluating the available-P by an anionic exchangeable membrane (AER) and bicarbonate solution extractions, as also solid P speciation by X-ray Absorption Near Edge Structure (XANES) analysis performed at a Synchrotron source. The AER results showed that available-P in BioFert treatment was, on average, 14% superior in sandy, 56% in loamy, and 72% in clayey soil than triple superphosphate (TSP). XANES results pointed out Al- and Fe-phosphates as the main P-sink for all soils, however both fertilizers introduced P-Ca in the system. The superiority of BioFert was associated with its capacity to buffer the soil pH in values higher than 7 potentially reducing P immobilization. In summary, results support the higher efficiency of BioFert than TSP observed in previous work because it supplies more available P synchronized to plant demand over time. (AU)

• Processo FAPESP: 16/13813-8 - Caracterização, produção e avaliação de biofertilizante organomineral à base de palha de cana-de-açúcar pirolisada
• Beneficiário: Bernardo Melo Montes Nogueira Borges
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado