Abstract: 【Objective】The objective of this paper was to elucidate the relation of soil fertility and yield increasing benefits and potentiality, in order to rational allocation of fertilizer, and enhance crop yields in Yuxi area of Henan province. 【Method】 Based on field experiments and typical countries’ material, the relation of fertility application amount to crop yields in three type fields in Yuxi area of Henan was studied. 【Result】The results show that it achieved highest yields in flat land, and the yield of slopping land was lowest. Fertilizer could increase effectively yields. But the yield increasing benefits were depressed while land fertility increasing. The some results were got in typical county studied. According to field experiments results, the model of fertilizer application amounts and crop yields was build. And the yields increasing potentiality of Yuxi area had been discussed. If fertilizer of white was 200 kg•hm-2 and corn’s was 150 kg•hm-2,the fertilizer consumption of Yuxi area could been decreasing 31.7%, and the crop yields could been increasing 85.1%.【Conclusion】Land fertility hold remarkable impacts on fertilizer yield increasing benefits, and the yield increasing benefits was decreasing with the increasing of soil fertility. In county area crop yield could be enhanced with fertilizer rational allocation.

Key words: Fertilizer utilization efficiency, Agricultural resources allocation