刈割频率对杂交狼尾草生长和产量的影响

Effect of defoliation frequency on the growing characteristics and yield of Pennisetum americanum × P. purpureum

在地力中等、两种施肥水平条件下研究了刈割频率对杂交狼尾草生长性状的影响。结果表明,30 d、45 d和60 d刈割周期处理的杂交狼尾草全年生物量分别为193.48 t.hm-2、269.75 t.hm-2和237.77 t.hm-2。刈割促进杂交狼尾草的分蘖,但频繁刈割(30 d)造成杂交狼尾草地上部生物量下降,根系衰竭;60 d刈割周期造成生物量减少、茎/叶比增加;45 d刈割周期处理的杂交狼尾草产量和生长性状对草食动物的畜牧利用比较理想。

Effect of defoliation frequency on the growing characteristics and yield of Penniseturn americananm × P. purpureurn were studied under the condition of middle soil fertility and two fertilization rates. The results showed that the annual biomass amounts in the treatments of 30 d, 45 d and 60 d defoliation interval were 193.48 t · hm^-2 , 269.75 t · hm^-2 and 237.77 t · hm^-2 respectively. Defoliation stimulated the tillering trend of Pennisetum americanum × P. purpureum, however, frequent defoliation （30 d） reduced the up-ground biomass, caused the exhaustion of root system. Defoliation in long-term recycle （60 d） resulted in a reduction of biomass production, an increase of stem/leaf ratio, The biomass and growing characteristics of Pennisetum americanum × P. purpureum in the treatment of 45d defoliation interval were more ideal for its husbandry utilization of grass-eating animals.