Experimental studies on the effects of circulation rate on transfer and distribution of soil moisture and nitrate nitrogen of intermittent infiltration

The circulation rate directly affects the development of the water sealing layer, therefore weakens the infiltration reduction and the increase of advancing velocity of furrow flow under periodic water-supply. Under a simulated indoor environment, a vertical one-dimension intermittent fertilizer infiltration at 70 cm of underground water level, was set up. In the experiment, the influences of circulation rate on the infiltration reduction, the transfer and distribution characteristics of moisture and nitrate nitrogen in the soil were studied. The results indicate that with the same water supply, the smaller the circulation rate is, the better the water sealing layer develops, and the stronger the infiltration reduction is. Meanwhile the moisture and nitrate nitrogen would distribute in shallower soil layer, therefore the leaching trend of nitrate nitrogen weakens.