为降低陇中半干旱区冬小麦种植过程中化肥的施用量，减少土壤环境污染，提高

为降低陇中半干旱区冬小麦种植过程中化肥的施用量，减少土壤环境污染，提高化肥利用效率，采用二因素随机区组设计方法，通过大田试验，研究陇中半干旱区有机肥代替部分化肥对冬小麦间作豌豆氮肥利用率及产量的影响。结果表明：配施有机肥可以显着提高冬小麦和豌豆的吸氮量以及复合群体氮素利用率和产量。在配施有机肥的条件下，复合群体的氮素利用率在施用常量常规化肥减量30%的处理以及施用常量常规化肥减量15%的处理比施用常量常规化肥处理分别提高了12.99%和4.65%。在相同的常规化肥水平下，配施有机肥处理的冬小麦和豌豆的经济产量及生物产量均大于不配合施用有机肥处理的产量。常规施肥且配施有机肥处理豌豆和冬小麦的经济产量和生物产量均为最高，显着高于常规施肥5.22%和6.76%，高于常规化肥减量15%且配施有机肥处理5.97%和6.64%；常规施肥处理豌豆的经济产量和生物产量小于常规化肥减量15%且配施有机肥处理，说明在间作体系中，常规化肥减量15%并配施有机肥与单纯施常规化肥相比，有利于提高豌豆产量。<br>关键词：冬小麦；豌豆；有机肥；氮肥利用率；产量

In order to reduce the application amount of chemical fertilizer in the process of winter wheat planting in the middle of Gansu Province, reduce soil environmental pollution and improve the utilization efficiency of chemical fertilizer, the effects of organic fertilizer instead of part of chemical fertilizer on the nitrogen utilization efficiency and yield of winter wheat intercropping pea in the middle of Gansu Province were studied by using the method of two factor random block design and field experiment. The results showed that the combined application of organic fertilizer could significantly improve the nitrogen uptake, nitrogen use efficiency and yield of winter wheat and pea. Under the condition of combined application of organic fertilizer, the nitrogen use efficiency of compound population in the treatment of 30% reduction of constant conventional chemical fertilizer and 15% reduction of constant conventional chemical fertilizer increased by 12.99% and 4.65% respectively. Under the same level of conventional chemical fertilizer, the economic yield and biological yield of winter wheat and pea treated with organic fertilizer were greater than those without organic fertilizer. The economic yield and biological yield of pea and winter wheat treated with conventional fertilizer and combined application of organic fertilizer were the highest, which was significantly higher than that of conventional fertilizer by 5.22% and 6.76%, higher than that of conventional fertilizer by 15% and combined application of organic fertilizer by 5.97% and 6.64%; The economic yield and biological yield of pea treated with conventional fertilizer were less than that of conventional chemical fertilizer by 15%, and the treatment with organic fertilizer showed that in the intercropping system, the reduction of conventional chemical fertilizer by 15% and the application of organic fertilizer were beneficial to improve the yield of pea compared with the application of conventional chemical fertilizer alone.<br>Key words: winter wheat; Peas; Organic fertilizer; Nitrogen use efficiency; yield

In order to reduce the application amount of chemical fertilizer, reduce the soil environmental pollution and improve the utilization efficiency of chemical fertilizer in the process of planting winter wheat in the semi-arid area of central Gansu, a field experiment was conducted to study the effect of organic fertilizer instead of some chemical fertilizers on nitrogen utilization efficiency and yield of winter wheat intercropping peas in the semi-arid area of central Gansu. The results showed that the combined application of organic fertilizer could significantly increase the nitrogen uptake of winter wheat and peas, nitrogen utilization rate and yield of compound population. Under the condition of combined application of organic fertilizer, the nitrogen utilization efficiency of the compound population was increased by 12.99% and 4.65% respectively in the treatment of 30% reduction by constant conventional fertilizer and 15% reduction by constant conventional fertilizer. At the same level of conventional chemical fertilizer, the economic and biological yields of winter wheat and peas treated with organic fertilizer are higher than those without organic fertilizer. The economic yield and biological yield of pea and winter wheat treated with conventional fertilization and organic fertilizer are the highest, significantly higher than that of conventional fertilization by 5.22% and 6.76%, and higher than that of conventional fertilizer by 15% and organic fertilizer by 5.97% and 6.64%. The economic and biological yield of peas treated by conventional fertilization is less than that of conventional fertilizer by 15% and combined with organic fertilizer treatment, which indicates that in intercropping system, conventional fertilizer by 15% and combined with organic fertilizer are beneficial to increase pea yield compared with conventional fertilizer alone. Key words: winter wheat; Pea; Organic fertilizer; Nitrogen use efficiency; yield