Componentes agronômicos de milho cultivado sob níveis de vinhaça concentrada em regime sequeiro e irrigado

Abstract

Vinasse contributes to the supply of nutrients to the soil, especially to those with potassium deficiency, and can replace potassium mineral fertilization. The objective of this study was to evaluate the effect of concentrated vinasse application on the growth and grain yield of corn. The experiment was carried out under field conditions, at Instituto Federal Goiano, Campus Rio Verde-GO, in a dystroferric Red Latosol, cerrado phase, with a clayey texture. The factorial scheme 4 × 2 + 2 was used, with four replications. The treatments consisted of four doses of concentrated vinasse, equivalent to 100%, 200%, 300% and 400% of the potassium recommendation for corn and two water regimes (irrigated and rainfed), + two control treatments, with application of 100 % of potassium recommendation via potassium chloride (KCl) source, with and without irrigation. The variables evaluated were plant height, ear height, number of grains per row, number of row of grains per ear, number of ear per plant, mass of 1000 grains and corn grain yield. The absence of difference between water regimes and vinasse dose suggests that, under the conditions of the present study, the best dose to be used is 100% under rainfed regime.