不同品种甘蔗脱叶性和机收含杂率的测定与比较分析

Comparative Analysis and Determination of Defoliation and Impurity Rate of Different Varieties of Sugarcane

为筛选脱叶性强的甘蔗品种以适应机械化收获需要、降低机械收获的含杂率,以自然脱叶性不同的3种甘蔗品种为试验材料,通过统计成熟期甘蔗的自然脱叶率、测定+8、+9和+10叶位的叶鞘倾角及脱叶力等数值,探究它们与脱叶性强弱及机收含杂率之间的相关性。结果表明:‘ROC22’的脱叶性最强,自然脱叶率最好,叶鞘倾角平均值最大,平均脱叶力最小;‘GL05-136’的脱叶性次之,再次为‘GR2’。这3个品种的脱叶性与机械收获的含杂率变化趋势基本一致,即脱叶性强的甘蔗品种机械收获时的含杂率较低,反之,脱叶性差的甘蔗品种机械化收获时的含杂率则较高。

In order to select sugarcane varieties with easy self-defoliation for mechanized harvesting and reduce the impurity rate of mechanized harvesting 3 sugarcane varieties,GL05-136,GR2 and ROC22,with different self-defoliation capacities were planted and mechanically harvested.The natural self-defoliation rate of mature sugarcane was counted,and the sheath angle and defoliation force ruptured from the stem at the basal 8th,9th and 10th leaves were calculated to determine the correlation between defoliation and mechanized harvesting.The result showed that‘ROC22’has the best self-defoliation,the highest natural self-defoliation rate,the biggest average sheath angle and the minimum average defoliation force,followed by‘GL05-136’and‘GR2’.These 3 varieties of sugarcane showed similar change in relation between defoliation and impurity rate of the mechanized harvesting.The sugarcane variety with strong selfdefoliation had lower impurity rate of mechanized harvesting,while the weak self-defoliation sugarcane variety had.the higher impurity rate of mechanized harvesting.