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高寒半干旱区旱滩草甸栗钙土土壤贫磷少氮 ,增施氮磷肥显著提高春小麦产量 ,氮磷配合施用有机肥是提高春小麦产量的关键技术措施。单施无机肥时 ,N、P2 O5经济最佳施用量分别为 56 .95kg/ hm2和 4 9.2 3kg/ hm2 ,施有机肥 2 2 50 0 kg/ hm2时 ,N、P2 O5则分别为 30 .34kg/ hm2和 2 6 .0 2 kg/ hm2。氮磷配施使春小麦水分利用效率与降水利用效率分别较未施肥增大 1.98～2 .4 9kg/ (mm· hm2 )和 3.0 0～ 3.84 kg/ (mm· hm2 ) ,低量有机肥 2 2 50 0 kg/ hm2 与氮磷配施分别增大 2 .71～ 3.2 7kg/ (mm·hm2 )和 3.6 7～ 4 .70 kg/ (mm· hm2 ) ,高量有机肥 4 50 0 0 kg/ hm2 与氮磷配施则分别增大 3.0 8～ 3.73kg/ (mm·hm2 )和 4 .2 9～ 5.0 5kg/ (mm· hm2 )。氮磷与有机肥配施是充分挖掘春小麦水分生产潜力的有效途径
The soil of chestnut soil in semiarid area of semiarid semiarid area had less phosphorus and less nitrogen, the yield of spring wheat increased significantly with the application of nitrogen and phosphorus, and the combination of nitrogen and phosphorus was the key technique to increase the yield of spring wheat. When inorganic fertilizers were applied alone, the optimal economic application rates of N and P2 O5 were 56.95 kg / hm2 and 49.223 kg / hm2, respectively, and that of N and P2 O5 were 30 and 22.0 kg / hm2, respectively. 34 kg / hm2 and 26.020 kg / hm2. With the application of N and P, the water use efficiency and precipitation efficiency of spring wheat increased 1.98-2.49 kg / (mm · hm2) and 3.0 0-3.84 kg / (mm · hm2), respectively, The application rates of 50 0 kg / hm2 and nitrogen and phosphorus increased by 2.71 ~ 3.2 7 kg / (mm · hm2) and 3.6 7 ~ 4 .70 kg / (mm · hm2), respectively, and the high amount of organic fertilizer 4 50 0 0 kg / hm2 and nitrogen and phosphorus application increased 3.08 ~ 3.73kg / (mm · hm2) and 4.29 ~ 5.05kg / (mm · hm2) respectively. Nitrogen and phosphorous combined with organic fertilizer is an effective way to fully tap the potential of spring wheat water production