Abstract:

In order to continued and safly apply organic manure and nitrogen fertilizer and clear the effect law about fertilizing large amount of manure to inorganic nitrogen use efficiency during vegetable cultivation, the 15N tracer method was used in the study, which was used to show the response of increase the application of manure to inorganic nitrogen utilization efficiency and the manure aftereffect to the use of soil residual 15N-urea. The results showed: 1st season vegetables insided 25%-26% N from 15N-urea in single application of chemical fertilizer (CF), and it was 14%-18% in organic fertilizer (CF+M), the chemical N use efficiency (UEN) was 25.61% and18.16%. After effect of organic organic also significantly affected the 2st season vegetables from the soil the percentage of residual 15N -urea(NDF) and the 2st season vegetables for 1st season residue 15N-urea utilization. For two growing seasons, accumulative UEN researched 28.76% and 19.60% of the applied CF and CF+M. Compared with the CF, CF+M on a quarterly basis 0-200 cm post-harvest soil 15N-urea was no significant effect on the recovery, but the application of organic fertilizer to promote the accumulation of nitrate and down profiles. Further, CF+M caused significantly higher percentage of 15N-urea loss compared with CF (P＜0.05); they were 53.7% and 61.2%, respectively after two growing seasons.