BOTANICAL COMPOSITION AND QUALITY OF PEARL MILLET PASTURE UNDER GRAZING WITH NITROGEN LEVELS
Abstract
Grazing and fertilization are cleterminant factors that modify botanical composition and quality of pasture. A grazing experiment with pear) millet grass (Pennisettan american um (L.) Leeke) was conducted at Universidade Federal de Santa Maria, Santa Maria, RS, Brazil, to evaluate lhe effects of nitrogen leveis (0, 150, 300, 450 e 600 kg hal) on botanical composition and quality of pasture components. It was used beef heifers in grazing to maintain the intended forage offer of 10 kg DM 100 kg' LW -1 , according the put-and-take technique (M orr and LUCAS, 1952), in an completely randomized design with two replication. Pasture evaluation were made every 28 days, with cut of pasture at sou' levei, and subsequent hand separation aí components. The nitrogen leveis no had effect about botanical composition, that showed expressive cont ri but ion of Digitaria adscendens and Brachioria plantotinea.Nitrogen increase crude protein (P<0,00 I ) and decrease "in vitro"organic matter digestibility of components (P<0,05).
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