河南省三大土壤类型区的平衡施肥研究

河南省三大土壤类型区氮磷钾平衡施肥对优质小麦郑麦366的增产作用不同。从试验结果看，氮磷钾平衡施肥在三大土壤类型区（褐土、潮土、砂姜黑土）均能提高小麦产量；限制小麦产量的主要因素：第1位是氮素，第2住是磷素，第3位是钾素。在平衡施肥处理时，潮土区小麦产量最高为8749kg／hm^2，其次褐土区产量为8385kg/hm^2，砂姜黑土区产量最低为7616kg／hm^2和8029kg／hm^2。

Study of Equilibrium Fertilizer Application in Three Major Soil Category Districts in Henan Province

The equilibrium application of nitrogenous, phosphatic and potassic fertilizers in the three major soil category districts in Henan Provice shows a difference in the increase in yield of Zheng Mai 366 high-quality wheat. It can be seen from the experimental results that equilibrium fertilizer application in the districts （brown soil, moisture soil and sajong black soil） can raise the wheat yield, and the main factors that restrict the wheat yield are： first, nitrogen; second, phosphorus; and third, potassium. In equilibrium fertilizer application, the highest wheat yield in the moisture soil district is 8 749 kg/hm^2, that in the brown soil district comes second, at 8 385 kg/hm^2, and that in the sajong black soil district is 7 616 kg/hm^2（the lowest） and 8 029 kg/hm^2.