不同钾肥施用量对羊草产量、品质及养分吸收的影响

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K2O 180kg/hm2时,产草量最高为15 320kg/hm2,较对照增产6.1%,种子产量为474kg/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180K2O 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K2O 120kg/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K2O 180kg/hm2时营养价值最高,且该施肥条件下经济效益最高,为34 227元/hm2,较对照增收11.1%。

Effect of potassium fertilization on the yield,quality and nutrients uptake of Leymus chinensis

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%.