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以天津市主要蔬菜产区为研究对象,通过分析大棚内菜地耕层土壤及0～90cm垂直分层土样,研究蔬菜地氮肥污染现状。结果表明,耕层土壤硝态氮积累量表现为蓟县>西青>静海>北辰,且菜地土壤硝态氮含量随土层深度的增加有递减趋势;蔬菜地土壤盐分与土壤硝态氮含量之间呈极显著的正相关;手持田间快速硝态氮测定仪对农田测土施肥具有一定的指导作用。
Taking the main vegetable producing areas in Tianjin as the research object, the status of nitrogenous fertilizer pollution in vegetable fields was studied by analyzing the topsoil and the 0 ~ 90cm vertical stratified soil samples in the greenhouse. The results showed that the accumulation of nitrate nitrogen in topsoil showed as follows: Jixian> Xiqing> Jinghai> Beichen, and the content of nitrate nitrogen in vegetable soil decreased with the depth of soil layer; the content of soil salinity and soil nitrate content Was very significant positive correlation; hand-held fast nitrate analyzer for measuring soil fertility in farmland has a guiding role.