Disponibilidade de água no solo para cultivo do sorgo forrageiro em neossolo flúvico

Abstract

The objective of this study was to define the water availability factor in Flossic Neosol that allows the maximum agronomic performance without altering the chemical-bromatological composition of two forage sorghum hybrids under irrigated conditions in Janaúba-MG. The work was conducted in an experimental area located at the State University of Montes Claros, Janaúba-MG Campus, in a Psamytic Flavic Neosol with total storage capacity of water equal to 59 mm in the first 0.3 m depth. The experiment consisted of 5 factors of soil water availability (f1 = 0,20; f2 = 0,35; F3 = 0,50; f4 = 0,65 and f5 = 0,80) and two simple hybrids of forage sorghum (Volumax and BRS 655), arranged in the plots subdivided. with the plots and the factors hybrids in the subplots in the randomized block experimental design with four replications. From differentiation, fortnightly were evaluated the plant height, diameter, cross- sectional diameter of plant, number of leaves per plant, leaf area index, chlorophyll relative content, diameter of stem, panicle length, dry matter, water use efficiency, crude protein, ash, acid detergent fiber, neutral detergent fiber and lignin. It was observed that adopting a factor f between 0,20 and 0,35 can achieve higher dry matter production and plant height of sorghum hybrids BRS 655 and Volumax". Volumax” hybrid obtained best levels of crude protein and acid detergent fiber. F factors studied in this work have not altered the chemical composition-qualitative characteristics of hybrids.