| Fertilizers play an important role in increase of crop production. For the spring maize growing areas in Heilongjiang Province, an unreasonable application of fertilizer leads to low utilization rate of fertilizer, as well as environmental pollution problems. So this test fertilizer requirements of corn laws and nutrition diagnosis were studied.The field experiment was effected in the Northeast Agricultural University, Xiang fang Farm, test soil is black soil, testing for Toyota on the 6th of maize varieties. Experimental Design Methods, "3414" test design, methods according to randomized block field permutations and combinations. Regression equation is established by setting corn nitrogen, phosphorus, potassium usage as independent variables, and the yield as the dependent variable with reference to methods such as linear-plus-platform, and according to which the best corn NPK fertilizer application rate and the best ratio are determined. At the same time, this study also tested the validity of the method of plant nutrition diagnosis chlorophyll meter method (for nitrogen) on the corn, and reached the following Conclusion:1. Through the establishment of response function of maize fertilizer in Black Earth Region and determining the amount of fertilizer in linear-plus-platform way, considering soil fertility levels and climatic environment in the experimental area, finaly result was got as the maximum profit yield of the spring maize is 7854.3 kg hm-2, the recommended amount of fertilizer N, P and K fertilizers were N147.7 kg.hm-2, P2O554.7 kg.hm-2, K2O20.0kg hm-2, N: P2O5: K2O = 1:0.37:0.14. The result also shows that the role of nitrogen fertilizer on corn yield is greater than phosphate and potassium.2. Under the experimental conditions, nitrogen for the corn dry matter accumulation and yield the greatest change, with continued nitrogen was applied to dry matter accumulation and yield of maize increased gradually after a certain amount of fertilizer nitrogen fertilizer and corn dry matter accumulation production have stabilized and no longer increases. The P and K of the Application at the dry matter accumulation and corn yield for the role and did not achieve this effect.3. In dealing with six or N2P2K2 level, the amount of nitrogen absorbed by the spring which produces 100 kilograms of maize grain is 2.52kg, the amount of phosphorus is 0.63kg, the amount of potassium is 1.51kg.4. Chlorophyll meter values and total nitrogen content of corn leaves, corn grain yield and N fertilizer rate were significant correlation among them. To overcome the differences between crop varieties on chlorophyll meter impact, the effect of chlorophyll meter in the Corn Nitrogen fertilizer recommendation in the prediction accuracy of the preliminary study, after Statistical Analysis, the values of chlorophyll meter corn fertilizer recommendations in the spring Nitrogen nutrition in the prediction accuracy of 68%.The use of chlorophyll meter value of corn fertilizer recommendations initially established diagnostic indicators, using a linear-plus-platform principle, broadly to determine the optimum amount of nitrogen in the 150 kg.hm-2, and utilization of fertilizer effect equation to push closer to the recommended optimum amount of nitrogen.5. The experimental condition, NPK fertilizers not only increase production, but also increase the utilization rate of fertilizer. The absorption and utilization rate of nitrogen, phosphorus and potassium are respectively 36.4%, 15.2% and 14.5%. According to the soil available nitrogen, available phosphorus and potassium as well as the determination of targets set by the relative yield to establish the soil nutrient status of soil nutrients under the target.
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