平衡施肥对老龄多叶老芒麦种子产量的影响

Effects of fertilization on the seed yield of Elymus sibiricus

针对在青海高寒地区出现的老龄多叶老芒麦种子产量逐年降低问题,在一定氮钾肥(N=112.5kg/hm2KCl=52.5kg/hm2)基础上配施不同水平磷肥以及在一定氮磷肥(N=75kg/hm2P2O5=75kg/hm2)基础上配施不同水平钾肥的研究,表明平衡施肥能增加老龄多叶老芒麦种子产量,种子产量增加的原因主要是平衡施肥提高了多叶老芒麦的单位面积的生殖枝数和种子千粒重,而对构成种子产量的其它方面影响不大;老龄多叶老芒麦最佳平衡施肥组合为N=75kg/hm2P2O5=75kg/hm2KCl=75kg/hm2。

Fertilizer application was conducted by increasing levels of phosphorus on the basic of applying mixture of nitrogen and potassium (N=112.5 kg/hm2 KCl=52.5 kg/hm2) and increasing levels of potassium on the basic of applying mixtures of nitrogen and phosphorus (N=75 kg/hm2 P2O5=75 kg/hm2). The result indicated that balance fertilization had higher seed yield by increased the number of genital branches and seed weight. The optimum fertilizer composition was 75 kg/hm2 of nitrogen, 75 kg/hm2of P2O5and 75 kg/hm2 of KCl.