Chemical attributes of a remineralized Oxisol

Autor(es)

da Silva, Rafael CIpriano ^[1] ; Cury, Marina Elias ^[2] ; Cardinali Ieda, Joao Jose ^[2] ; Sermarini, Renata Alcarde ^[3] ; de Azevedo, Antonio Carlos ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Solos & Nutr Plantas, ESALQ, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, ESALQ, Piracicaba, SP - Brazil

^[3] Univ Sao Paulo, Dept Ciencias Exatas, ESALQ, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Ciência Rural; v. 47, n. 11 2017.
• Citações Web of Science: 0

Resumo

Remineralizers are comminuted rocks that are applied to soil, and their use as an agricultural amendment was regulated in Brazil in 2013. However, mechanisms of action of these materials must be better known to enable them to be best used in agricultural fields. Soil chemical attributes of an Oxisol were monitored after the application of a diabase remineralizer. The increase in exchangeable Na observed was associated with the dissolution of the border of the plagioclase crystals where this element is highly concentrated (albite). Therefore, it was inferred that the time since the application of the remineralizer (1 to 2 years depending on the treatment) was not sufficient to exhaust this crystal volume. Unfortunately, the presence of several sources of Ca-containing minerals in the remineralizer did not allow to infer if the calcic nuclei was dissolving. An increase in effective cation exchange capacity was observed without the concurrent increase in the pH of the soil. The two non-exclusive hypotheses proposed to explain this result were that an extra surface charge has originated on the surface of the newly precipitated oxidic phases and/or from the dissolution of the remineralizer grains. Rapid precipitation of amorphous solids (as measured by the increase in Al-o and Fe-o) would also explain the lack of increase in exchangeable Fe and Al despite the large amount of Al2O3 (11.90%) and Fe2O3 (14.45%) in the remineralizer. (AU)

• Processo FAPESP: 14/10057-2 - Aplicação de remineralizador de basalto/diabásio em milho (Zea maiz) como fonte de nutrientes para as plantas
• Beneficiário: Marina Elias Cury
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica