On the nitrate-N accumulated characteristics in deep soil layer of winter wheat field in Taihang Piedmont

Nitrogen leaching of farmland is one of the important way of nitrogen loss.By sampling soil solution and analyzing its content of nitrate-N, nitrate-N accumulated characteristics in different N treatments in 40～220cm soil layer are studied. The results showed that the different N treatments affected greatly nitrateN accumulation in different soil layers. soil nitrate-N has highly accumulated in 80cm and 140～160cm layer and has an increasing trend of N accumulation in winter season. There is a linear correlation between nitrate-N a ccumulation in different layers and N input. Superfluous N input would arise N accumulating in deep soil and losing.