Fertilizer effects of full-film double furrowing corn in high altitude dry-land area

With ‘3414’ experiment design,the effects of nitrogen,phosphorus and potash on full-film double furrowing corn yield in a typical high altitude dry-land areas was studied.And the function model for output of corn was set up as well.The results showed that the highest yield was N2P2K0treatment,its yield reached 5 561.3kg/hm2.N,P,K fertilizer response function equation was Y =1 434.465 2 + 2 803.090 1 X1 +520.158 3 X2-299.046 3 X3-344.187 3 X21-235.232 7 X22-235.846 4 X2 3-65.748 9 X1 × X2-360.7034 X1 × X3 +436.614 8 X2 ×X3.The influence degree on the yield was NPK,in which N,P showed positive effect,while K showed negative effect.Soil available nutrient abundance and deficiency levels showed a low level of N and P,but very high level of K.The fertilization amount of the highest corn yield abtained were N 180kg/hm2,P2O5 49.75kg/hm2 and K2O 0kg/hm2,and the application ratio was 3.62∶1∶0.Sensitivity analysis on the three factors showed that the further testing should improve N fertilizer and reducing K fertilizer application.