Studies on effect of applying several new type nitrogen fertilizer on nitrate accumulation in two-reap leafy vegetable and soil nitrate leaching in high fertility vegetable by earth column simulation experiment method.Results showed that

in high fertility vegetable soil

applying several new type nitrogenous fertilizers couldn't increased the first reap rape biomass and ammonium sulphate nitrate(ASN) decreased biomass

but the second reap spinach's biomass decreased in no fertilizer treatment.Urea nitrification inhibitor DMPP(Entec46)

Urea nitrification inhibitor DCD(U DCD) and organic-inorganic fertilizer(OIF) decreased significantly nitrate content of rape.The urea maize straw(U MS) and ammonium sulphate nitrate nitrification inhibitor DMPP(Entec26) reduced soil nitrate nitrogen leaching

while urea super absorbent polymers(U SAP) increased soil nitrate leaching