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Experimental Study on Nitrogen Transformation under Waterlogging in Dry Farmland

The paper mainly focuses on the rules of nitrogen transferring and transformation under the condition of water logging. Our experiment had set three groups, waterlogged in 1 day, waterlogged in 3 days, waterlogged in 5days. Through taking water samples in testing holes, testing the concentration of ammonium, nitrate, TN to study the rules of nitrogen transferring and transformation under the condition of water logging. Experiments had exposed that, nitrogen appeared in where roots grow vigorously in upland field. During the first day to the third day of waterlogged, the concentration of nitrogen declined steeply in the underground 10cm-80cm. After that, the level of nitrogen stabilized about some concentration. The amount of nitrogen absorbed by cotton lowered after 3 days of water logging.