摘要： 在京郊大同肥力水平土壤上，有机肥和化肥配合施用小麦增产量最高，其增量在中、高肥力试验点上大于低肥力试验点。有机肥和化肥配合施用时的增产作用是它们各自增产效应之和，它们之间的交互效应不显著。在高肥力土壤上甚至有负的交互效应，即配台施用时的增产量小于分施时各自增产量之和。根据肥料试验，本文提出了京郊不同肥力水平土壤上小麦有机无机肥料配合施用量，并发现在低肥力土壤上随着有机肥的施用，化肥氮的用量增加，化肥磷用量可减少；在高肥力土壤上随有机肥的施用，化肥氮用量减少，化肥磷用量增加；在中等肥力土壤上配合有机肥的施用，氮磷化肥用量均个应减少，应略为增加。

关键词: 有机肥, 化肥, 交互效应

Abstract: Combined application of organic and chemical fertilioers to soils at different fertilily levels in the suburbs of Beijing resulted in the highest yield for wheat.Then the yield at the medium一and high一fertility test fields was higher.than that at low-Icrtility test liclds.The feet of increasing yield resulting from the combined application of the both types of fcrtiliicrs was equal to the sum of separate effects of the organic and mineral fertiliocrs in increase of yield, and no signilicant interaction was found between the two types of Icrtilicrs, but in soils at higher fcrtiiity levels negative interaction was }bscrvcd.On the basis of the fcrtilr expcrinvents, combined application rates of organic and mineral Icrtiliocrs for wheat which was grown in soil at different Icrtility levels in the suburbs of I3cijing were proposed.It was lound that N application rate increased and P application rate decreased in the soil wish low fertility to which the organic manurcs were applied, that N application rate decreased and P applica-lion rate increased as organic manurcs were applied to high-fertility soils; and that NP applicanon rates would increase to the medium一fertility soils, if the organic manurcs were applied to it combined with them.M15

Key words: Organic manurcs, Chemical fertilizen, Intcraction