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Effect of Nitrogen Dose on Nitrate-Nitrogen Accumulation in Soil in Protected Cultivation

QIN Qiao-yan et al (College of Agronomy,Yangtze University,Jingzhou,Hubei 434025)  
Effects of Nitrogen dose on nitrate-nitrogen accumulation in soil in protected field were observed.The results indicated that soil nitrate-nitrogen accumulation increased with the increase of the amount of chemical fertilizer nitrogen applied,especially in the 0~1 m layer.The nitrate-nitrogen accumulation in 0~2 m soil profile was far higher than it in adjacent crop fields.High accumulation and transfered characteristic of nitrate nitrogen in protected field soil were significantly threaten to environment.
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