CARACTERÍSTICAS DAS SILAGENS DE CINCO GENÓTIPOS DE SORGO CULTIVADOS NO INVERNO

Abstract

The experiment was carried out in the Experimental farm of Unimontes in Janaúba, North of MinasGerais, aiming at determining characteristics of the silages of five sorghum genotypes cultivated in the winter.The genotypes Volumax, AG 2005E, Qualimax, BRS 610 and AG 2501 were used. The planting in the field wasaccomplished in blocks at random, with four replications per genotype. Data were subjected to analysis of varianceusing the Sisvar program and mean comparisons were done according to the Scott-Knott test at 5% significance. Aftercutting, part of the material was ensiled. After the silos opening, the samples were pre-dried, ground and packed inglass flasks for analyses of pH, NH3/NT, latic acid, acetic acid and dry matter digestibility in vitro. The pH values, NH3/NT, lactic acid and acetic acid of the silages were adequate for a good fermentation profile. The largest percentagesof DIVDM of the silages were found in the Qualimax, BRS 610 and AG 2005E genotypes that did not differ amongthemselves and were superior to the others. The data were submitted to variance analysis through the Sisvar programand mean comparisons were done in agreement with Scott-Knott test at 5%. The studied genotypes presented goodgreen mass yield and also agronomic characteristics and nutritional value appropriated to the production of silageswith good fermentative pattern when cultivated in the winter.

Keywords

• agronomic evaluation
• forage production
• winter planting