Abstract: To improve the chemical nitrogen fertilizer use efficiency,reduce environmental pollution risk caused by nitrogen leaching,research and application of controlled release fertilizer are given special attention in recent years. This paper researches on the effects of application of three kinds of controlled release fertilizers which are resin coated urea,sulfur coated urea and DCD added nitrogen on nitrate accumulation in cabbage and soil nitrate leaching by the method of field experiment,under highly fertility soil conditions. The results showed: resin coated urea could improved the cabbage's economic output and biomass significantly by 15. 0% comparing the normal,sulfur coated urea improved by 7. 3% ,the effect of DCD added nitrogen was not significant comparing the normal; nitrate content in cabbage applied DCD added nitrogen was lower than the conventional N by 20. 3% ,but resin coated urea and sulfur coated urea improved by 11. 3% ,20. 3% respectively; The three kinds of controlled release fertilizer could be keep nitrate in the main root in the cabbage in a certain period,the effects of resin coating was relatively stable at rosette stage, heading stage and harvesting time,sulfur coated and DCD added nitrogen were effective in the early period,leaching was strengthened in the latter period.

Key words: Vegetable, Soil, Nitrate, Controlled release fertilizer

CLC Number: 

• S143.1