刈割周期对苏丹草叶片生长的影响

THE EFFECT OF CUTTING CYCLE ON LEAVES GROWTH OF SUDANGRASS

刈割周期长短对苏丹草的新叶出露间隔期，叶片发育速度、功能叶比例、叶片伸长速度和叶面积指数（ＬＡＩ）均有不同程度的影响。适当的刈割周期可以刺激叶片更新、增加功能叶比例，提高草层中的叶量，改善苏丹草对鱼的适口性。

The cutting cycle could affect new leaves appearance plastochron of sudangrass,the rate of leafdevelopment,the rate of the functional leaves,the rate of leaf extension and leaf area index. Theappropriate cutting cycle could stimulate renewal of leaves,and increase the rate of functional leaves andthe number of leaves in grass layer and could improve the palatability for fish.