Abstract
The effects of cutting plant age (21, 28, 35, 42, 49, 56, 63 and 70 days) on dry matter (DM) yield, and radiation use efficiency (RUE) of Axonopus aureus, during rainy season, were evaluated under natural field conditions. DM yields, absolute growth rate (AGR), crop growth and relative growth rates and leaf area increased consistently with growth stage. The relations between DM yield and AGR with cutting plants age were described by the quadratic regression model. The maximum DM yield, AGR and RUE were estimated at 65.4; 48.8 and 47.9 days of regrowth, respectively. The response of forage yield to incident photosynthetically active radiation was quadratic and maximum value estimated at 483.4 MJ/m2, which corresponded to 1,257 kg of DM/ha. These data suggest that cutting at 49 to 56 days were optimal for obtain maximum dry matter yields and improved the incident RUE.
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