不同施肥水平与养分组合对紫花苜蓿产草量的影响

本试验于2004～2005年在南疆库尔勒大华公司的灌耕潮土上，采用二因素三水平Ⅲ间施肥试验，观测氮、磷、钾肥的小同施肥水平与组合对苜蓿当年及第二年产草量的影响。结果表明，在试验范围内，当年苜蓿最高产量施肥量N，P2O5，K2O分别为43．0，147．2，77．1kg／hm^2。预测最高产量为9781．6kg／hm^2；第二年苜蓿最高产量施肥量N，P2O5，K2O分别为50．0，201．6，73．7kg／hm^2。预测最高产量为18320．1kg／hm^2；对2004，2005两年平均产量而言，最高产量施肥量N，P2O5，K2O分别为55．1，157．2，85．1kg／hm^2。随年限的增加苜蓿固氮能力增强，对氮肥的依赖性会逐渐减小，而对磷钾肥为耗竭吸收，因而预测的施肥量随年限延长而增加。

Effects of Different Variety and Level of Supplying Fertilizer on the Hay Yield of Alfalfa

The field fertilizer experiment with 3 factors and 3 levels of alfalfa was carried out in Korla,the south of Xinjiang in 2004 and 2005.Effects of different variety and level of nitrogen,phosphate and potassium fertilizer on the yield of alfalfa in the first year and the following year.The result showed that: in the experimental field under same nutritional condition,in 2004 the highest quantities of fertilizers application were N: 43.0 kg/hm~2,P_2O_5: 147.2 kg/hm~2,K_2O: 77.1 kg/hm~2 respectively,and the highest output of test was 9781.6 kg/hm~2;in 2005 the highest quantities of fertilizers application were(N: 50.0 kg/hm~2,)P_2O_5: 201.6 kg/hm~2,K_2O: 73.7 kg/hm~2 respectively,and the highest output of test was(18 320.1 kg/hm~2;)in comparison with the average yeild of the two years,2004 and 2005,the highest quantities of fertilizers application were N: 55.1 kg/hm~2,P_2O_5: 157.2 kg/hm~2,K_2O: 85.1 kg/hm~2 respectively.As the number of years have been increased,soil nutrient has changed in alfalfa field: N has increased,P and K have been dropped,so it needs to pay attention to phosphate fertilizer and potassium fertilizer in practice.