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在华北地区露地生产条件下 ,通过监测 5季轮作蔬菜 (苋菜 -菠菜 -花椰菜 -苋菜 -菠菜 )的产量和土壤无机N(Nmin)的变化 ,比较了传统的和采用平衡方法进行推荐的水分和N素处理对土壤Nmin残留数量的影响。结果表明 ,除花椰菜试验外 ,传统N素处理与推荐的N素处理在蔬菜产量上没有显著差异 ,但传统的N素处理皆可导致深层土体中Nmin的大量累积。在 4季蔬菜轮作后 ,传统灌溉措施条件下的N素处理都不同程度地造成了土体的N素淋失 ,所影响的土层深度已经达到了 15 0～ 180cm土层 ,然而采用平衡方法进行推荐的水分和N素处理组合对土体深层土壤中Nmin残留数量没有造成明显的影响
Under open field production in North China, by monitoring the yield of vegetables (amaranth-spinach-cauliflower-amaranth-spinach) and the change of soil inorganic N (Nmin) in the seasons, the comparison of the traditional and balanced methods Effect of N Treatment on Nmin Residues in Soil. The results showed that there was no significant difference between the conventional N treatment and the recommended N treatment except the cauliflower experiment, but the traditional N treatment could lead to the accumulation of Nmin in the deep soil. After the vegetable rotation in 4 seasons, the N treatment under the traditional irrigation measures resulted in N leaching of soil in varying degrees, and the depth of the affected soil reached 15 0-180 cm soil layer. However, the balance method The combination of the recommended water and N treatments did not significantly affect the Nmin residual in the soil