Research on the Characteristics of Soil Nitrogen Runoff Loss in Upland Rice Field

The outdoor dry upland rice field experiment was used to study the effects on form and content of upland rice field soil nitrogen loss under different nitrogen application levels in the upstream areas of Chaohu Lake. The results showed: (1)Nitrate nitrogen was the main form of soil nitrogen loss in upland rice field, accounting for 0.55 - 0.97 of inorganic nitrogen loss, but there was a rain on the short term after fertilization, the loss increased in the form of ammonium Nitrogen, and accounting for 0.36 - 0.43 of inorganic nitrogen loss; (2) With the increase of fertilizer levels, the loss of nitrogen was correlated with fertilizing amount; The model of organic and inorganic nitrogen fertilizer combined application could reduce the loss of soil nitrogen 8.6-16.3% in the upland rice field, and reduce the concentration of nitrogen in runoff water effectively, meanwhile help to reduce nitrogen pollution to the environment and improve the yield of upland rice.