施肥方式对甜高粱生长发育及糖分含量的影响

Effects of Fertilization Methods on Growth and Sugar Content of Sweet Sorghum

为了探明氮、钾肥施肥方式对甜高粱生长发育及茎秆糖分含量的影响,以甜高粱辽甜1号为试材,在施用不同数量的种(底)肥和追肥条件下,对甜高粱株高、叶面积、糖锤度、生物鲜质量及估算总糖量进行了比较分析。结果表明,一次性底施氮磷钾复合肥600kg/hm2的处理甜高粱株高、生物鲜质量、估算总糖量均最低。底施300kg/hm2氮磷钾复合肥+追施300kg/hm2尿素的处理株高及生物鲜质量最高。灌浆期,底施300kg/hm2氮磷钾复合肥+追施450kg/hm2尿素的处理叶面积指数最高。底施300kg/hm2氮磷钾复合肥+追施150kg/hm2尿素+追施150kg/hm2硫酸钾的施肥方式可以得到最高的估算总糖量。

For researching the effect of nitrogen and potassium fertilizers on sweet sorghum, some agronomic characters and sugar contents of sweet sorghum hybrid （Liao-tian 1） were determined under different fertilization methods. The result indicated that the plant height, fresh weight and estimated total sugar content of sweet sorghum with the treatment of entire base fertilizer application of compound fertilizer 600 kg/ha were all the lowest of all treatments. The plant height and fresh weight of the treatment with compound fertilizer 300 kg/ha as seed manure and urea 300 kg/ha as topdressing were the highest of all treatments. In the filling stage,the LAI of sorghum with compound fertilizer 300 kg/ha as seed manure and urea 450 kg/ha as topdressing was higher than other treatments in the experiment. Under the fertilization method of compound fertilizer 300 kg/ha as seed manure and urea 150 kg/ha and potassium sulfate 150 kg/ha as topdressing,the estimated total sugar content of sweet sorghum was the highest in the experiment