Study On The Fertilization Scheme Of Maize In Shanxi Province Under The Multi-Objective Optimization

As one of the major food crops in Shanxi Province, corn plays a vital role in the food security of Shanxi province. In recent years, in order to pursue the high yield of maize, most areas of Shanxi province put a lot of fertilizer in corn planting process. A great amount of fertilizer application has made an important contribution to the yield of maize in Shanxi province, but the other problem is that the put of a large amount of fertilizer leads to a large amount of carbon and nitrogen gas emission, which leads to environmental pollution. Therefore, it is needed from the height of science to find a optimized fertilization scheme which can ensure the yield of maize, reduce the carbon and nitrogen emission and ensure the stability of soil organic carbon.In this study, we make use of soil data, meteorological data, crop data and management practices data. Using the DNDC model to simulate the maize production, emissions of carbon and nitrogen and soil organic carbon content in Shanxi province. A total of three fertilization schemes were set up in the study: the amount of fertilization in the survey of agricultural planting system, reduced to 80% of the survey fertilizers, reduced to 60% of the survey fertilizers. These three programs are implemented by modifying the operating parameters of the DNDC model. The results show:(1)When the DNDC model using the amount of fertilization of the survey agricultural planting system, the distribution of maize yield and emissions of carbon and nitrogen showed that the south was more than that in the north, the average yield was 8523 kg/hm2, the average CO2 emission is 2776 kg C/hm2, the average N2O emission is 3.11 kg N/hm2.(2)When the DNDC model using the amount of reduced to 80% of the survey fertilizers, the average maize yield per hectare decreased by 149 kg, per acre is reduced by about 9.9 kg, reduced by about 1.8 percent. The average CO2 emission per hectare decreased by 121 kg C, per acre is reduced by about 8.1 kg C, reduced by about 4.4 percent. The average N2O emission per hectare decreased by 0.35 kg N, per acre is reduced by about 0.04 kg N, reduced by about 17.8 percent. No change soil organic carbon content.(3)When the DNDC model using the amount of reduced to 60% of the survey fertilizers, the average maize yield per hectare decreased by 1614 kg, per acre is reduced by about 94 kg, reduced by about 16.7 percent. The average CO2 emission per hectare decreased by 261 kg C, per acre is reduced by about 17.4 kg C, reduced by about 9.4 percent. The average N2O emission per hectare decreased by 1.03 kg N, per acre is reduced by about 0.07 kg N, reduced by about 34.9 percent. No change soil organic carbon content.(4)Comprehensive maize yield, carbon and nitrogen emissions and soil organic carbon content of these three factors, analysis of the above two kinds of reduction fertilization treatment program, When using the amount of reduced to 60% of the survey fertilizers, not only can guarantee the maize yield, but also can reduce the emission of carbon and nitrogen, and also to ensure the stability of soil organic carbon, which is of great significance to ensure food security in Shanxi province and to reduce environmental pollution and the sustainability of farmland.