In order to achieve cost-effective synergy as well as alleviate the adverse environmental effects caused by large and multiple topdressing,the mid-late-maturing japonica rice "Yanfeng 47" as test material was used in this research,three experimental groups (conventional fertilizer,Zhongkehong stable compound fertilizer,and carbon-based fertilizer) and a blank control group were established to study the growth and nitrogen metabolism of rice treated with slow/controlled release fertilizers as well as their effect on yield. The results showed that there is no significant difference in yield when comparing the two slow/controlled release fertilizers against conventional fertilizer. The high yields of the Zhongkehong stable compound fertilizer group and conventional fertilizer group could mainly be attributed to a larger number of effective panicles,while carbon-based fertilizers increased yield due to the higher numbers of grains,higher seed set rate,and higher 1 000-grain weight. As for nitrogen metabolism,the two slow/controlled release fertilizers increased the activities of nitrate reductase (NR),glutamine synthase (GS),nitrite reductase (NiR),and soluble protein content in functional rice leaves during the heading stage,while glutamate synthase (GOGAT) activity was significantly higher when using conventional fertilizer compared to all other groups. Zhongkehong stable compound fertilizer contained nitrification inhibitors,urease inhibitors and other components that ensure a longer nutrient release cycle and improve nitrogen metabolism capacity during key stages of plant growth,especially toward the end of the heading stage in order to preserve the stem and increase the number of panicles. Carbon-based fertilizers employed biochar and other functional groups to improve soil nutrient retention and improved the extractable nutrient content and its effectiveness. Because of this,a balanced usage of Zhongkehong stable compound fertilizer and carbon-based fertilizer could reduce the amount of chemical fertilizer during stable rice production (reduction of 151.50,187.50 kg/hm² compared with conventional fertilizer) may have real-world value in the development of green sustainable agriculture cultivation in coastal saline-alkaline areas.