Biogenic, sedimentary, and metamorphic limestone: a comparative characterization of soil amendment
AUTOR(ES)
Cazotti, Maria Maiara
FONTE
Rev. Ceres
DATA DE PUBLICAÇÃO
2019-02
RESUMO
RESUMO A correção da acidez é fundamental para a atividade agrícola em solos ácidos, assim como a caracterização e estudo do efeito no solo de fontes alternativas de corretivos. Objetivou-se caracterizar os calcários de origem biológica, sedimentar e metamórfica. Os calcários estudados foram: biogênico (CB), sedimentar (CS), comercial (CC) e o mármore (CM). Foram avaliados: poder relativo de neutralização total (PRNT); composição química; área superficial específica e liberação de Ca2+ e Mg2+ nas concentrações de 0,10; 0,50; 1,00 e 2,00 mol L-1 de HCl e os efeitos no solo, após 90 dias da aplicação dos calcários. O Si identificado contribuiu para o menor PRNT do CB (73,7%) e CC (74,4%). Nas menores concentrações de HCl, o CB mostrou-se mais reativo, porém com o aumento da concentração do HCl, o CM passou a ser mais reativo. Os maiores teores de CaO (58,32%) e MgO (13,05%) foram observados no CS e CM, respectivamente, que contribuíram com maiores aportes de Ca2+ (3,95 cmolc dm-3) e Mg2+ (1,09 cmolc dm-3), quando aplicados ao solo. Todos os calcários promoveram elevação do pH e redução do H+Al no solo. Os teores de Ca2+ e Mg2+ no solo foram influenciados pela composição dos corretivos.ABSTRACT Liming acid soils is fundamental for agricultural activity such as the study and characterization of alternative liming material. The objective of this study was to characterize biological, sedimentary, and metamorphic limestones. The following limestones were studied: biogenic (BL), sedimentary (SL), commercial (CL), and marble (ML). This study evaluated total relative neutralizing power (TRNP), chemical composition, specific surface area, and Ca2+and Mg2+release at concentrations of 0.10, 0.50, 1.00, and 2.00 mol L-1 HCl, in addition to the effects on the soil 90 days after limestone application. The Si identified contributed to the lower TRNP of BL (73.7%) and CL (74.4%). At the lowest HCl concentrations, BL was the most reactive, but with an increase in concentration, ML became the most reactive. The highest CaO (58.32%) and MgO (13.05%) levels were observed in SL and ML, respectively, which contained the highest Ca2+(3.95 cmolcdm-3) and Mg2+ (1.09 cmolcdm-3) concentrations when applied to the soil. All the limestones increased pH and lowered soil H+Al. Soil Ca2+and Mg2+were influenced by the composition of the amendments.
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