Accuracy of methods to estimate potential acidity and lime requirement in soils of west region of Santa Catarina

作者：Predebon Rodrigo; Gatiboni Luciano Colpo; Mumbach Gilmar Luiz^*; Schmitt Djalma Eugenio; Dall'Orsoletta Daniel Joao; Brunetto Gustavo

来源：Ciencia Rural, 2018, 48(4): e20160935.

DOI：10.1590/0103-8478cr20160935

• SMP
• calcium acetate
• base saturation
• liming

The objective of this study was to compare two methods of evaluation of potencial acidity (H+Al) and two methods to estimate liming requirement (LR) for soils from the west region of Santa Catarina State, Brazil. Fourteen soils were incubated with 7 lime rates for 120 days, obtaining the real values of H+Al at pH 7.0 and LR. These values were used as reference to evaluate the accuracy of two H+Al estimating methods: SMP buffer and calcium acetate at pH 7.0, and to evaluate the accuracy of two LR methods: base saturation (BS) and SMP index. On average, H+Al was underestimated in 6 and 40% by SMP and calcium acetate methods, respectively, especially in soils with high buffer capacity. The LR was underestimated in 20 and 30% by SMP index and BS, respectively. The SMP Index showed a better LR estimative than BS, especially in soils with high buffer capacity.

• 出版日期2018