Peanut response to rates of agricultural gypsum under Sorriso-MT conditions

Abstract

Peanut cultivation in Mato Grosso is normally carried out in marginal and sandy areas, whose soils are commonly exhausted after successive cultivations and intense rainfall, resulting in low levels of Calcium (Ca) and Sulfur (S). In this context, the objective of this work was to evaluate the effects of gypsum application on the peanut response in Sorriso-MT. The experimental design used was randomized blocks, with treatments arranged in a 2 x 5 factorial scheme, with two peanut cultivars, IAC 503 and Granoleico, five doses of agricultural gypsum (Gypsita) 0.00; 0.25; 0.50; 0.75 and 1.0 Mg ha^-1, with 4 repetitions. Gypsum was surface-applied 35 days after emergence, at the beginning of flowering stage. At 135 days after sowing, at harvest time, grain yield (kg ha^-1), shelling percentage (%) and 100-seed weight (g) were evaluated. For the environmental conditions in which the experiment was conducted, the cultivar Granoleico was more productive than the cultivar IAC 503. The shelling percentage and 100-seeds weight were not influenced by the cultivars and doses of gypsum. Peanut grain yield had linear increase by increasing the gypsum rate