Gesso agrícola e ácidos orgânicos na toxidez de cobre em vinhedos da Serra Gaúcha

Abstract

The objective of the present work was to evaluate the effect of gypsum and organic matter application on copper availability in a vineyard soil in Serra Gaucha. The experiment was conducted with grapevines in the municipality of Flores da Cunha, RS, Brazil. It was performed in a trellised vineyard established in 1965 with copper toxicity problems in the plants, with randomized block design, in 4 rows selected in a homogeneous area of the vineyard. The treatments consisted in the application of gypsum at doses of 0, 1000, 2000, and 3000 kg per hectare and organic carbon at doses of 0, 1200, 2400, and 3600 kg per hectare. Chlorophyll content of the leaves, yield per plant, yield per hectare and nutrient content of the soil were evaluated. Doses of organic acids above 1200 kg per hectare reduced the chlorophyll index at the berry filling and post-harvest stages. Gypsum at the tested doses decreased the chlorophyll indexes as its doses increased at the 5-leaf stage. The productivity and remediation on excess copper are not influenced by the tested doses of organic acids and agricultural gypsum. [resumo fornecido pelo autor]