Efeito do silicato de cálcio e magnésio e do gesso agrícola no crescimento, produção e potencial hídrico da cana-de-açúcar

Abstract

This study aimed to, evaluate the effect of gypsum associated with calcium silicate and magnesium on growth, production and drought tolerance of sugarcane. The experiment was conducted in agricultural area belonging to Capricho Mill, located in the city Cajueiro, AL. The experimental design was a randomized complete block in a split plot with four replications. The plot consisted of five rows of 10 m length with 1 m between rows. The treatments consisted of five doses of calcium silicate and magnesium (0, 1, 2, 3 e 4 Mg ha-1) and two of gypsum (0 e 1,9 Mg ha-1) applied before planting. The variety used in the experiment was RB92579. The growth of sugar cane was not altered by the application of calcium silicate and magnesium. Calcium silicate and magnesium increased potassium and magnesium and decreased the contents of boron, manganese and copper in the dry weight of the leaf +3. The application of calcium silicate and magnesium associated with gypsum did not increase the productivity of sugarcane in cane plant cycle. The presence of gypsum and silicate gave a higher biomass allocation to root system. The gypsum provided an increase in leaf water potential during the dry season. However, did not affect the oxidative state of the leaves. The calcium silicate and gypsum and magnesium along the increased index values SPAD.