Study of Fertilizer Efficiency Test of Summer Maize(Zea mays L.) in Field and Its Correlation Parameter

[Objective] The aim was to confirm on the optimum fertilizer application amount of summer maize of different yield level.[Method] Three kinds of tests of summer maize,3414 test,nitrogen fertilizer application amount test,abundance and deficiency index test,were carried out in Linying County in 2007-2010.[Result] Under the local production conditions,the optimum fertilizer application amount of summer maize in Linying County was as follows:Under the high yield level,nitrogen fertilizer 123.15-216.60 kg/hm2,phosphate fertilizer 51.00-91.50 kg/hm2,potassium fertilizer 25.20-83.85 kg/hm2;under the medium yield level,nitrogen fertilizer 109.35-187.50 kg/hm2,phosphate fertilizer 36.30-79.35 kg/hm2,potassium fertilizer 11.55-60.75 kg/hm2;their lower limit was chose when the soil nutrient content was high,while their upper limit was chose when the soil nutrient content was low.The amount of fertilizer needed of obtaining 100 kg-yield of summer maize was as follows:Nitrogen 2.50 kg,phosphate 0.78kg,potassium 1.61 kg;its fertilizer application amount was as follows:Nitrogen 21.52%-26.20%,phosphate 7.31%-8.43%,potassium 24.09%-33.96%;its supplication of soil nutrient was as follows:Nitrogen 116.25-158.10 kg/hm2,phosphate 39.90-82.65 kg/hm2,potassium 93.00-108.90 kg/hm2.[Conclusion]The study provides a scientific guidance for improving the popularity rate,coverage rate and technology utilization rate of the formula fertilization by soil testing,to increase the production capacity in a maximum degree to make farmer use the less investment to obtain the bigger income.