Morphogenesis and leaf biomass accumulation in elephantgrass sward evaluated at diferent period of the year

Abstract

The objective of this work was to evaluate the effect of the time of the year on morphogenetic and structural traits and leaf biomass accumulation of elephantgrass (Pennisetum purpureum Schum.). The sward was managed in a rotational stocking method with lactacting cows with 30 days of resting period and three days of paddock occupation. A randomized block and six replicates were used. Evaluations were carried out at February/March, April/May, July/August and October of 2001. Higher values of leaf appearance and expansion rates were observed during the February/March period. Although the aerial tiller density was greater than the basal one, they showed lower leaf expansion (5.1 versus 9.8 cm/day/tiller), appearance (0.13 versus 0.16 leaves/day/tiller) and senescence (0.9 versus 1.3 cm/day/tiller) rates. The forage mass production and accumulation rates of leaf biomass were higher during February/March period and showed strong relationship with pasture morphogenetic traits. The aerial tillers contributed, in average, with 63% of total elephantgrass leaf biomass.