A pot experiment and field trials were conducted to study on nitrogen release dynamics of a controlled-release fertilizer and its effects on quality and yield of leafy vegetables. It was observed that BCRF treatment resulted in significant higher soil NH4-N content than other treatments during whole growth period of flowering Chinese cabbage (FCC). On the other hand, soil NO3-N content of BCRF was evidently lower than that of BVSF in early and medium growth stages, and also lower than that of SVSF in late stage. In addition to meeting the demand for nitrogen nutrition of major leafy vegetables such as FCC in Guangdong, BCRF stably increased commercial yields and improved vegetable quality through increasing concentrations of vitamin C and soluble sugar, meanwhile decreasing concentration of nitrate in the products.
Key words
controlled-release fertilizer;NH4-N;NO3-N;leafy vegetable
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References
1 许秀成，李菂萍，王好斌. 包裹型缓释/控制释放肥料专题报告（第一报）-概念区分及评判标准. 磷肥与复肥, 2000, 15(3):1~6
2. 高橋正輝.肥效調節型肥料による施肥技術の新展開. 5野菜の施肥技術（その2）.日本：土壤肥料學雜誌，1998,69(3):303~309
3. Ristimaki,L.M. Slow release fertilizers on vegetables. Acta Hort., 2000,(511):125~129
4. Guertal,E.A. Preplant slow-release nitrogen fertilizers produce similar bell peper yields as split applications of soluble fertilizer. Agron.J.,2000,92:388~393
5. Brown,B D , Hornbacher, A J，Naylor,D V . Sulfur-coated urea as a slow-release nitrogen source for onions. J.Amer.Soc.Hort.Sci.,1988,113(6):864~869
