Effects Of Nitrogen Applications On Crops' Yield And Soil Nitrogen Content

Nitrogen element is the most important element in terrestrial ecosystems and also one of the essential element of crops growed. The number of nitrogen or the numbers of fertilizer regimes influence the growth of wheat and corn yield index and production index. To increase the number of nitrogen, people usually used large amounts of nitrogen fertilizer in agricultural production. Fertilizer application of fertilizer rate and extensive increase gradually, it is safeguard food production safety and supply of basic way and basic measures. Not only the fertilizer increase to have production surueyed in high achievement of grains, but also brings a series of environmental problems. The fertilization is the most important measures to increase grain in agricultural process of production. The application of fertilizer is also basic way to promote the process of crop in the process. However, a number of nitrogen will lead to all aspects of serious results. Improper fertilization not only can lead to reduce crop yield, but also can cause the leaching loss of soil nitrogen in the soil, at last it will lead to be more serious resulting in groundwater pollution of groundwater environment that are threatened. How to ensure food security and reduce environment pollution to raise the utilization ratio of resource perspective fertilizer application in control.It is the inevitable requirement of sustainable development of agriculture.This article studied under the condition of nitrogen on winter wheat and summer corn crop yields and the influence of soil nitrogen migration and different depth in soil nitrogen and analyzes the distribution of different nitrogen fertilization of nitrogen fertilizer effect and the best. Winter wheat and summer corn test set respectively in the Chinese academy of sciences in Tongzhou of Beijing geographical science and resources institute test base field experiments for different. There are six level of nitrogen each processing Settings 3 repeat, total 18 experimental districts in this experiment. Winter wheat and corn set six level of nitrogen is 0 kgN/hm², 111 kgN/hm², 222 kgN/hm², 333 kgN/hm², 444kgN/hm² and555 kgN/hm².The Experimental results indicated that the different number of the nitrogen condition the winter wheat and the summer corn in various soil layers soil nitrogen content each same, the soil nitric nitrogen as well as the soil ammonium condition nitrogen content different changes along with the depth of soil. The different application of nitrogen has certain influence to soil profile and ammonium nitrate nitrogen content. The different nitrogen of each layer of soil NO₃^-—N contents, significant influence on increased nitrogen accumulation of soil NO₃^-—N increased, easy occurrence of NO₃^-—N leaching. Different nitrogen content of soil nitrogen accumulation of ammonium nitrate nitrogen content relative to smaller, different nitrogen application to each layer of soil nitrogen content ammonium effect isn't significant. During the summer of winter wheat and maize growth caused by excessive nitrogenous fertilizer applied in the soil of nitrate accumulation, soil NO₃^-—N with the quantity and the content of irrigation to deeper layers mobile; precipitation Winter wheat and summer corn crop ecological index and output index to the level of nitrogen change significantly. The results indicated that under the premise of the guarantee production, reduce the sprinkler crops of nitrogen is effective to reduce soil and soil ammonium nitrate nitrogen accumulation of content in the soil solute and potential of the important ways. In order to achieve high yield and fertilizer, the purpose of efficient utilization of nitrogen winter wheat suitable from150 to 200 kg/hm². Corn appropriate nitrogen level from150 to 200 kg/hm².