生长后期喷施石灰水或KH2PO4对甘蔗糖分积累、产量和某些生理特性的影响

用桂糖１１号和台糖１３４作为供试甘蔗品种，在生长后期（１０月１１日）叶面喷施石灰水和ＫＨ２ＰＯ４。结果提高了甘蔗叶片的Ｍｇ２＋－ＡＴＰ酶、Ｃａ２＋－ＡＴＰ酶、ＮＡＤＰ－苹果酸酶和中性转化酶活性以及蔗糖和水分含量，促进了甘蔗蔗糖分提高而使蔗汁还原糖分降低。石灰水处理甘蔗品质提高较快，而ＫＨ２ＰＯ４处理甘蔗品质提高效应维持时间相对较长。两种处理都有一定的增产作用，其中石灰水处理的增产幅度较大，与对照的差异达到了统计显著水平。ＫＨ２ＰＯ４处理还明显提高了甘蔗叶片的过氧化物酶、多酚氧化酶活性、呼吸强度和叶绿素含量。

The Effects of Foliar Spray of Limewater or KH2PO4 at Late Growth stage on Sugar Accumulation, Yield and Some Physiological Characters in Sugarcane

Two sugarcane varieties, GT11 and F134, were sprayed 2% limcwater or 0. 1 % KH2PO4 solution on the leaves at late growth stage(on October 11). As compared with the control, both of the treatments showed higher activities of Mg2+ ATPase, Ca2+ ATPase, NADP malic enzyme and neutral invcrtase,and higher contents of sucrose and water in leaves, resulting in a higher sucrose content in cane but lower reducing suber content in jUice. The limewater treatment improved cane quality more quickly than the KH2PO4 treatment, but a longer duration of the effect was found in the later treatment. Both of the treatments produced higher cane yield than the control, but the increase was higher in the limewater treatment. which was statistically significant as compared with the control. The KH2PO4 treatment also increased activities of peroxidase and polyphenol oxidase, and respiratory intensity, and chlorophy11 content in leaves as compared with the control.