Características morfoestruturais de gramíneas anuais submetidas a diferentes manejos de desfolha

Abstract

The objective of the project was to evaluate the influence of defoliation management on the agronomic characteristics of Sudan grass (Sorghum sudanense cv. BRS Estribo and S. sudanense cv. Common), a millet cultivar (Pennisetum glaucum cv. BRS 1503) and a double purpose sorghum cultivar (Sorghum bicolor cv. Catisorgo). It was be carried out in a greenhouse and the treatments consistedof sudan grass, millet and sorghum was analyzed when submitted to different defoliation management. The treatments were two cultivars of Sudan grass (Sorghum sudanense cv. BRS Estribo and S. sudanense cv. Common), one millet cultivar (Pennisetum glaucum cv. BRS 1503) and a tricross sorghum cultivar(Sorghum bicolor cv. Catisorgo). The design was be completely randomized and followed a 4x3x2 factorial scheme and four replications, with four cultivars (previously mentioned), three indicative defoliation heights (one, two and three expanded leaves intact) and two residue heights (5 and 10 cm). The cutting management was little influenced by the residue heights, the four cultivars presented lower AUL, AP, CP while submitted to the residue height of 5 cm. The same was true for the fully expanded 1, 2 and 3 leaves, the variables CP, CTF, AUL, AP and TF showed little variation. Sudan Grass cv.1503 was a better alternative for animal production.