摘要
研究结果表明.酸性红壤施适量石灰,能改善甘蔗的N、P、K养分状况,提高Ca2+-ATP酶和中性转化酶活性,减缓甘蔗在伸长期Ca2+-ATP酶活性降低的幅度,极显著地促进甘蔗生长。石灰施用量与甘蔗叶片N、K含量、Ca2+-ATP酶活性及甘蔗株高里极显著或显著的二次函数曲线相关;与甘蔗叶片含P量、中性转化酶活性亦呈二次函数曲线相关,但相关性未达显著水平。研究结果还表明,施石灰量不同对甘蔗各生长时期株高的影响很大,施用量为1.2t/hm2左右时,甘蔗前、中、后期的株高都极显著的高于对照,小于0.4t/hm2或大于2.0t/hm2时,甘蔗生长后期的株高与对照差异不显著.
The study showed that N, P and K status of sugarcane were improved,and Ca2+-ATPase activity and neutral invertase activity increased by lime application toacid red soil. Liming could also alleviate the decrease in Ca2+-ATPase activity at elongating stage, hence promoted sugarcane growth. The regulative effect of lime application on N, K contents, Ca2+-ATPase and sugarcane height resembled quadric curve.The same tendency was observed for neutral invertase activity and P content in sugarcane, but the correlation was not significant. It was also showed that appropiate application of lime (about 1. 2t/hm2) result in significantly higher yield than that of the checktreatment at tillering stage, early elongating stage and late elongating stage, when theamount of lime application was less than 0. 4t/hm2, or between 2. 0t/hm2 to 2. 4t/hm2,the yield of sugarcane did not significantly differ from that of the check treatment at lateelongating stage.
关键词
酸性红壤
石灰
甘蔗
养分
酶活性
acid red soil
lime
sugarcane
nutrient
enzyme activity