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Abstract
The defoliation frequency determines above and below ground biomass accumulation, pasture structure and nutritive value. Two defoliation experiments with Panicum coloratum were performed, from September to March. One of them was conducted in pots under greenhouse conditions, and the other one in field plots for three growing seasons (EC) at the Faculty of Agronomy, La Pampa, Argentina (36˚ 46' S; 64˚ 16' W). Defoliation frequency treatments were four cutting intervals (IC; 3, 4, 6 and 8 weeks). In greenhouse experiment, live leaf blade accumulation rates (TAL), tiller appearance (TAM) and death (TMM) rates, live leaf blade length (LL) and above and below ground dry matter (MS) accumulation were determined. In field plots tiller height, weight and tiller, crude protein (PB) and dry matter accumulation were determined. TAL and the TAM were 1.28 (0.1024 vs 0.0798 cm/tiller/°Cd; P
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