Effect of Reasonable Allocation of Fertilizer on Soil Nutrient Dynamic and Yield in Wheat

Use the ″3414″ regression design model to studied the effect of N,P and K fertilizer application on soil nutrient dynamic change and yield in wheat through field experimentation and chemical analysis.The results indicates that,the change of soil nutrient content exhibits a definite rules and a reasonable application of fertilizer could increase wheat yield by 20.57%-41.39%,the treatment of N2P2K2(N 255 kg/ha,P2O5 150 kg/ha,K2O 150 kg/ha)was the best.And at the base of experiment,the yield model of the fertilizers is Y=5 720.338+5.142 8N+12.028 7P+7.322 9K-0.012 1N2-0.038 7P2-0.021 6K2+0.008 8NP-0.000 5NK-0.002 8PK,and its top yield is at 8 083.16 kg/ha while the application quantity of N,P2O5 and K2O is at 275.17,181.10 and 154.59 kg/ha;Its the economical and reasonable quantity of fertilizers application are 212.31,152.23 and 117.51 kg/ha while the wheat yield is 7 985.18 kg/ha,the profits of applying fertilizer is 948.62 yuan/ha.