Seasonal aerial biomass accumulation of native lucerne (Medicago sativa L.)

To know the dynamics herbage yield at different times of the year, is a useful methodology for improving pasture management and optimize the performance and quality plant. The aim of the study was to determine the herbage accumulation curves, average growth rate, forage height, leaf: stem ratio, and botanical composition in a lucerne pastureland of 3 yr of established. The experimental design was a randomized complete block design with four replicates. The highest dry matter yield was recorded (P<0.01) at 49 regrowth days in spring, summer and autumn (2,794, 2,680 and 2,116 kg DM ha(-1), respectively), and 42 d in winter (3,416 Kg DM ha(-1)). The highest growth rates (61 kg DM ha-1 d(-1)) and the lower leaf: stem ratio was recorded in the winter. The increased presence of other grasses and weeds was in spring and summer. It concludes to make defoliations every 35 to 40 d in winter and autumn, whereas in spring and summer every 30 to 35 d, not every 40 d regardless of the season, as it is commonly done in the region.