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

• Main Authors: Rodrigo Predebon, Luciano Colpo Gatiboni, Gilmar Luiz Mumbach, Djalma Eugenio Schmitt, Daniel João Dall’Orsoletta, Gustavo Brunetto
• Format: Article
• Language: English
• Published: Universidade Federal de Santa Maria 2018-04-01
• Series: Ciência Rural
• Subjects: SMP; calcium acetate; base saturation; liming
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000400253&lng=en&tlng=en
• ISSN: 1678-4596

ABSTRACT: 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.