Forage production and morphogenesis of Axonopus aureus at different cutting ages
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Keywords:
plant age, dry matter, leaves, morphogenesisAbstract
The effects of cutting plant age (21, 28, 35, 42, 49, 56, 63 and 70 days) on dry matter (DM) yield, and morphogenetic and structural characteristics of Axonopus aureus, was evaluated under natural field conditions. The experimental design was a completely randomized, with three replications. Evaluations were carried out during the period of May to July of 2008. DM yields, absolute growth rate, number of tillers/plant, number of leafs/plant, leaf area, senescence rate and blade length increased consistently with growth stage. The relations between DM yield and forage production rate with cutting plants age was described by the quadratic regression model. The maximum DM yield and forage production rate performance were estimated at 65.4 and 48.8 days of regrowth. The crop growth and relative growth rates, and appearance and elongation rates were inversely proportional to cutting plant age. These data suggest that cutting at 49 to 56 days were optimal for obtain maximum dry matter yields and improved the grass morphogenetic and structural characteristics.
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Copyright (c) 2010 Newton de Lucena Costa, Vicente Gianluppi, Amaury Burlamaqui Bendahan, Ramayana Menezes Braga, Paulo Sérgio Ribeiro de Mattos
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