Condicionador de solo e adubação potássica em pastagem de milheto na região da Serra Gaúcha

Abstract

The objective of this work was to evaluate the efficiency of Ecoonfós® soil conditioner in the development and productivity of pearl millet pasture with different doses of potassium chloride. The experiment was conducted in the field, harvest 2022/2023, in the municipality of Caxias do Sul-RS. The millet variety BRS 1501® was sown by broadcast and incorporated with light harrowing. The experiment was conducted as a factorial 2 (with and without the use of soil conditioner) x 4 (four doses of potassium chloride: T1 0kg/ha; T2 50 kg/ha; T3 100 kg/ha; T4 150 kg/ha) in an experimental design of randomized blocks, with 4 replications each, totaling 32 plots. The soil conditioner used was Ecoonfós® at a dose of 2.5 L/ha. The evaluated variables were: the content of chlorophyll a, b and total of the leaves, plant height and productivity of green and dry matter at the end of the productive cycle. All evaluated parameters did not show interaction between the different doses of potassium and the use or not of soil conditioner. There was a significant increase in plant height with the highest dose of potassium being 150 kg/ha and an increase in fresh mass and dry mass in the area with soil conditioner application. However, the increase in potassium doses did not affect the other evaluated parameters. Thus, under the conditions tested, it can be concluded that the soil conditioner increases productivity of dry and fresh mass of millet without interference from potassium fertilization. [resumo fornecido pelo autor]