Effects of Different Nitrogenous Fertilizer Modality and Film Mulching on Corn Yield and Soil Nitrogen Loss of Slope Land

By using two factors and four levels randomized block experiment design,utilizing simulated runoff observation method,the effects of nitrogen forms and film mulching on corn yield and soil nitrogen loss fluxes and approach in slope land were studied.The results showed that the main runoff approach of soil was surface runoff,the main runoff approach of nitrogen was underground runoff,accounting for 71.3% of runoff,the main runoff form of nitrogen was the nitrate nitrogen,accounting for 92.0% of IN,and accounting for 57.1% of TDN.the depth of runoff and soil erosion were reduced by plastic film mulching,the loss of TDN and corn yield were increased by plastic film mulching,but nitrogen loss was reduced by amide nitrogen fertilizer and slow controlled release fertilizer on plastic film mulching,moreover corn yield was increased significantly by amide nitrogen fertilizer;the depth of underground runoff and nitrogen loss were reduced by nitrate nitrogen fertilizer and slow controlled release fertilizer on bare conditions,moreover corn yield was increased significantly by slow controlled release fertilizer.Considering the soil erosion control and grain increase production,the suitable fertilizer type in Sichuan purple slope land were slow controlled release fertilizer,the next was nitrate nitrogen fertilizer,the amide nitrogen fertilizer could not only control nitrogen loss,but also increase corn yield by plastic film mulching.