Efeito da aplicação de lama de cal sobre a acidez do solo e na nutrição mineral da cultura do feijão-comum

Abstract

The objective of this study was to analyze the possibility of replacing the use of agricultural limestone with lime sludge in the practice of soil liming and mineral nutrition of common bean. The experiment was carried out in a controlled environment at the Universidade Federal da Fronteira Sul-UFFS / Campus de Laranjeiras do Sul-PR, located at BR-158, Km 405, using a RED Dystroferric LATOSOL. The experiment was carried out by means of two comparative tests (Test 01 and Test 02) between lime sludge and shell limestone. In Trial 01 the experimental design was a 2 x 4 + 1 factorial consisting of 2 types of correctives (shell limestone and lime mud), 5 dosages of the correctives tested (0, 1,5, 3, 6 and 12 t ha -1) and 1 control, with 5 replicates, totaling 50 experimental units (polyethylene bags). In Trial 02, the experimental design was a completely randomized design, consisting of 4 treatments with 10 replicates, totaling 40 experimental units (polyethylene containers with 8 dm-3 capacity). Six viable seeds of BRS Pérola bean were sown in each vase. In this way the treatments tested were: T1: Control, without the application of lime mud or shell limestone; T2: Application of 6 t ha-1 of lime mud; T3: Application of 6 t ha-1 of shell limestone in the dosage; T4: Application of 3 t ha-1 of lime sludge (50%) + 3 t ha-1 of limestone of shells (50%). The data were submitted to analysis of variance (ANOVA) and the means were compared by the Tukey test using statistical software R version 3.5.3, with a significance index of 5%. The application of lime sludge proved to be equally efficient to the limestone of the shells in the pH correction, reduction of Al3 +, reduction of potential acidity and Ca2 + supply, being compared to a high PRNT limestone.