Abstract: A field experiment with Chinese cabbage, water spinach, and three-colored amaranth cropped three times in one year was conducted to study the effects of seven fertilization modes, i.e., none fertilization, basal application of chemical fertilizers, 1/2 basal application and 1/2 top-dressing of chemical fertilizers, basal application of chemical fertilizers and dicyandiamide, 1/2 basal application and 1/2 top-dressing of chemical fertilizers and dicyandiamide, 1/2 basal application and 1/2 top-dressing of chemical fertilizers and organic manure, and basal application of organic manure, on the plant height, yield, nitrogen accumulation, and fertilizer nitrogen utilization of the vegetables, and the loss of NO3--N and NH4+-N from vegetable field under natural rainfall condition. The results showed that comparing with none fertilization, the fertilization modes ‘1/2 basal application and 1/2 top-dressing of chemical fertilizers and organic manure’ and ‘basal application of chemical fertilizers and dicyandiamide’ improved the agronomic properties of test vegetables, increased their yields by 103%〖KG-*2〗-〖KG-*7〗219% and 93%〖KG-*2〗-〖KG-*7〗226%, and nitrogen accumulation by 153%〖KG-*2〗-〖KG-*7〗216% and 231%〖KG-*2〗-〖KG-*7〗320%, respectively, and enhanced fertilizer nitrogen utilization rate. They also decreased the surface runoff loss of NO3--N and NH4+-N by 481% and 465%, respectively, compared with the mode ‘basal application of chemical fertilizers’, and hence, reduced the risk of agricultural non-point pollution. Therefore, these two fertilization modes could be popularized in vegetable production.

Key words: index of biological integrity (IBI), aquatic ecosystem health, microbe-index of biological integrity (M_IBI).