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The oblique farmland in the northern part of China is often affected by rainfall, which arises out of the loss of a large amount of nitrogen, which causes the reduction of crop yield and the nutrient-rich pollution of river basins. Evaluating the impact of the trench farming layout on the loss of nitrogen production and flow of rainfall in sloping farmland can provide a scientific basis for the prediction and effective prevention and control of nitrogen loss in sloping farmland. Taking the oblique farmland of corn as the research object, nitrogen loss of distinctive ridges and the pitch of the ditches under natural rainfall conditions were continually observed by using the field prototype field observation test. According to the local farming tradition, three kinds of ridge and furrow trends should be set up, including horizontal ridge, vertical ridge and oblique ridge. The ridge and furrow spacing of the three tillage methods should be set at three levels, 40cm, 60cm and 80cm in turn. In addition, establish a field without ridge flat for blank control. Using the method of frequency statistics, it is calculated that the trench layout with the smallest nitrogen loss in each rainfall production stream is frequency in the annual rainfall production flow, and the trench layout with the smallest nitrogen loss is found from the overall trench layout and the same trench to different ridge spacing, and the same trench spacing to the three aspects of the trench layout. The results show that the optimal ridge and furrow layout with the minimum loss of nitrate nitrogen, ammonium nitrogen and total nitrogen is 60 cm ditch spacing in a horizontal ridge direction.

The effect of the trench layout on the loss of nitrogen production and flow from the rainfall of oblique farmland