不同施肥条件下地膜小麦增产效应的研究

Study on the effect of fertilizer application on the yield increasing of film mulched winter wheat

1998年～ 1 999年在渭北旱原不同施肥条件下进行地膜小麦增产效应研究 ,结果表明 :施肥可以显著提高覆膜冬小麦的水分利用率 [1 .9～ 3.9kg/( mm· hm2 ) ]和土壤耕层的有效养分含量 ;不同施肥量的增产效应不同 ,低肥、中肥和高肥 3个处理分别比不施肥对照处理增产 942 .4kg/hm2 ,1 633.8kg/hm2和 1 793.1 kg/hm2 ,增产率分别为 2 9.5 % ,5 1 .1 %和 5 6.1 % ;中肥水平 (施纯 N、纯 P分别为 1 87.5 kg/hm2 ,65 .5 kg/hm2 )的经济效益最高 ,产投比可达 3.4∶ 1。因此 ,在低、中、高 3个施肥水平中 ,中等施肥最为有效。

In the arid area of Weibei, field experiments' result during 1998~1999 showed that the application of fertilizer on wheat mulched with plastic film could obviously increase WUE by 1.9~3.9 kg/(mm·hm 2), enhance the contents of effective nutrition of N, P and K. Therefore, under the situation of film mulched winter wheat, fertilization could increase the yield by 942.4 kg/hm\+2~1 793.1 kg/hm\+2 compared with CK, and the treatment, which was fertilized with N 187.5 kg/hm\+2 and P 65.5 kg/hm\+2, was most effective.