Efeitos da irrigação com vinhaça por sulcos e na cana-de-açúcar (Saccharum spp.).

Abstract

The present work was developed at Usina Sumaúma in the municipality of Marechal Deodoro - Alagoas, aiming to study the effects of different seasons and dosages of vinasse applied by furrows in agro-industrial behavior of sugar cane (Saccharum spp), variety RB70194, and on the physical and chemical properties of the soil. The experimental design adopted was that of blocks chance with 8 treatments and A repetitions. The treatments consisted of 2 times of application of vinasse on plant cane (pre and post - planting), in dosages of 300, 600 and 900 m3 / ha with two witnesses. In vinasse treatments, the same mineral fertilization as the first control (80 Kg N, 70 Kg P205, 20 Kg CuSO4 and 15 Kg ZnSO4 / ha), while in the second control 140 Kg K2O / ha was added. The vinasse was applied by infiltration grooves directly in the crop lines, for pre-planting and between the lines for post-planting. It was observed that germination, tillering, dew-lap height and industrial characteristics of the sugar cane were not affected by vinasse, with the exception of the ash content% broth that increased with higher dosages. The analysis of variance of productivity showed differences between treatments, however, dosages 300 and 600 m3 / ha in post-planting showed higher sugarcane and sugar yields in the field, with these increases, an average of 30% more than other treatments. Soil analyzes, collected 3 months after application of vinasse, showed in general and beneficial achievements in physical and chemical characteristics of the soil (bulk density, percentage of soil saturation, organic matter), at least up to 20 cm deep.