Effects of Balanced Fertilization on Summer Maize in the Eastern Plains of Henan Province

In order to achieve balanced fertilization,increase yield of summer maize in the eastern plains of Henan,three field experiments was conducted to study the effects of recommended fertilization by ASI(a systematic approach for determining soil nutrient contents) on yield of summer maize and potassium fertilizer efficiency.The results showed that fertilization can significantly increase the yield of summer maize,and the increased rate is 22.6%-49.95%.Balanced fertilization(N,P2O5 and K2O) could increase grain yield significantly with a mean of 7.06% compared with famer habits fertilization.The average increase rate is 10.11% by potassium fertilizer application.But sulfur fertilizer showed no effect on yield increasing.Potassium fertilizer application could increase potassium accumulation of summer maize plant.The average recovery efficiency of applied K was 33.47%,the agronomic efficiency was 5.98kg/kg and the partial factor productivity was 61.22kg/kg.The effect was good of potassium balanced application in the eastern plains of Henan,and the peasants should apply rationally potassium fertilizer to summer maize.