不同钾肥施用量对羊草产量、品质及养分吸收的影响

摘要

在宁夏盐池县城西滩,以中科2号羊草为材料,研究施用氮磷肥的基础上再施用不同钾肥处理对羊草干草产量、品质、种子产量及养分吸收的影响。结果表明：钾肥有效提高产草量及种子产量,施用 K2 O 180 kg/hm2时,产草量最高为15320 kg/hm2,较对照增产6.1%,种子产量为474 kg/hm2,增产30.9%,钾肥对种子的增产效果优于产草量的增产效果；施用钾肥有效促进茎叶对氮、磷、钾的吸收,施用180 K2 O kg/hm2时吸氮量和吸磷量最大,较对照分别增加50.1%和45.9%,施用 K2 O 120 kg/hm2吸钾量最大,高出对照32.1%；钾肥能够显著增加羊草粗蛋白、粗脂肪和灰分含量,降低粗纤维含量和无氮浸出物含量,提高羊草营养价值,施用 K2 O 180 kg/hm2时营养价值最高,且该施肥条件下经济效益最高,为34227元/hm2,较对照增收11.1%。%The effect of different potassum fertilization treatments on the hay yield,quality,seed yield and nutrient uptake of Leymus chinensis cv.Zhongke No.2 was studied in Yanchi County of Ningxia Hui Autono-mous Region.The results showed that the hey yield and seed yield were significantly increased by potassium fer-tilization.The hey yield and the seed yield were the highest (15 320 kg/ha and 474 kg/ha)while the fertilizing rate was 180 kg K2 O/ha,which were increased by 6.1% and 30.9% respectively compare to the control.Potas-sium fertilizer could effectively promote absorption of nitrogen,phosphorus and potassium.The nitrogen and phosphorus absorption reached the maximum while the fertilizing rate was 180 kg K2 O/ha,increased by 50.1%and 45.9% compared to the control.Potassium absorption reached the maximum while the fertilizing rate was 120 kg K2 O/ha,increased by 32.1% compared to the control.Potassium could effectively increase the contents of crude protein,crude fat and ash,and lower the contents of crude fiber and nitrogen-free extractum.The nutri-tional value was the best while the fertilizing rate was 180 kg K2 O/ha,and the economic efficiency was increased by 1 1.1%.