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The Distribution and Movement of Soil Nitrogenous Formsin Soil Profile under Irrigation Water

Wang Baiqun; Yu Cunzu; Dai Mingjun; Peng Lin(Northwestern Institute of Soil and Water Conservation, Academia, Academia Sinicaand Ministry of Water Resources, Yangling,Shaanxi,712100)  
The simulative soil columns in the laboratory were used to research the distributionand movement of the forms of soil nitrogen in profile under different amount of irrigation water.It was indicated that the distribution of the fromation ous of soil nitrogen depended upon theirown chemical properties and duty of irrigative water after the nitrogen ous fertilizers were applied.Aminoacid N and NH_3-N move easily With the water movement in the profile and nonhydrolized N can hardly move with the water movement in the profile among the components of organic nitrogen.Nitrate move easily. ammonium did not move easily and nonexchangable ammonium can hardly move with the water movement in the profile among the components of inorganicnitrogen.At all,the leaching losses of NO 3--N were to be decided by the two main factors of theirrigative water and fertilizers.The leaching losses of nitrogen add with the increase in irrigativewater, moreover.application of nitrogen fertilizer can make the leaching losses of nitrate increasement.
【CateGory Index】: S153.6
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