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NPK fertilization is important in order to increase the crop yield and income for peanut farmers in Nanan with its existing soil conditions.Effect of fertilizer application on yield were found to be N PK,and the fertilization benefit NKP.The output/input ratio of N,P2O5 and K2O were 6.2,3.8 and 4.0,respectively.There was a negative correlation between the available NPK in soil and the nutrient utilization.The critical indices of low effective phosphorus content of critical index on alkali-hydrolyzable nitrogen,available P and K in soil were 65mgkg-1,14.8 mgkg-1 and 36 mgkg-1,respectively,and those of high were 120 mgkg-1,52.6 mgkg-1 and 133 mgkg-1,respectively.The recommended NPK application rate would be reduced with high available nutrients in soil.Maximum application rate of N for peanut was 96.3 17.5 kghm-2 and the ratio of N:P2O5 :K2O was 1:0.53:1.29.The economical application rate of N was 85.9 19.6 kghm-2 at the N:P2O5:K2O ratio of 1:0.51:1.25 for the peanut farming in Nanan region.
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