Abstract
It was aimed to evaluate the agronomic characteristics of three sorghum varieties as a function of the fertilization with poultry litter (PL) and the nutritional value of the silages. The experiment was carried out in a completely randomized design in a 5 x 3 factorial arrangement, with five doses of PL (0, 1000, 2000, 3000 e 4000 kg ha -1 ) and three varieties of sorghum (grain, forage and BRS 506). The BRS 506 and forage varieties presented the highest forage yield (P<0.05) as a function of PL fertilization at the 4000 kg ha -1 dose, with an average yield of 51.54 t ha -1 and 44.59 t ha -1 of fresh matter, respectively. Among the silages of the three varieties, BRS 506 presented the lowest pH, 3.49, and DM content close to 35%. The highest crude protein content was observed for the grain sorghum silage. The forage sorghum presented NDF content. The silages of the grain and BRS 506 varieties obtained the highest degradability potentially. The fertilization with 4000 kg PL ha -1 is recommended for the three sorghum varieties. For the silage preparation, the grain variety and BRS 506 presented excellent chemical characteristics and ruminal degradation.
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