[ Objective] The paper was to discuss the incidence regularity of Chinese cabbage tip-burn. [ Method] With five Chinese cabbage varieties bred by Zhengzhou Vegetable Research Institute and Beijing Xinsanhao as materia...[ Objective] The paper was to discuss the incidence regularity of Chinese cabbage tip-burn. [ Method] With five Chinese cabbage varieties bred by Zhengzhou Vegetable Research Institute and Beijing Xinsanhao as materials, the incidence regularity of tip-burn was studied using Chinese cabbage tip-burn identification method at seedling stage. [ Result] The disease index of tip-burn generally increased with the prolongation of culture time, but all varieties successively reached high susceptibility state at 45 d of calcium deficiency culture, and the disease basically reached a stable state at 55 d. Zhengbai 65 showed the best resist- ance in calcium deficiency treatment, while Zhengbai 4 displayed the worst tolerance and was very sensitive to calcium deficiency, with poor buffering capacity. Zhengbai 80 performed good buffering capacity in the early stage of calcium deficiency, but with the prolongation of culture time, the incidence developed rapidly in late stage. Other varieties showed different resistance and sensitivity, but they reached the stable incidence period almost at the same time point. [ Conclusion] The results provided a reference for prevention and control of tip-burn.展开更多
文摘[ Objective] The paper was to discuss the incidence regularity of Chinese cabbage tip-burn. [ Method] With five Chinese cabbage varieties bred by Zhengzhou Vegetable Research Institute and Beijing Xinsanhao as materials, the incidence regularity of tip-burn was studied using Chinese cabbage tip-burn identification method at seedling stage. [ Result] The disease index of tip-burn generally increased with the prolongation of culture time, but all varieties successively reached high susceptibility state at 45 d of calcium deficiency culture, and the disease basically reached a stable state at 55 d. Zhengbai 65 showed the best resist- ance in calcium deficiency treatment, while Zhengbai 4 displayed the worst tolerance and was very sensitive to calcium deficiency, with poor buffering capacity. Zhengbai 80 performed good buffering capacity in the early stage of calcium deficiency, but with the prolongation of culture time, the incidence developed rapidly in late stage. Other varieties showed different resistance and sensitivity, but they reached the stable incidence period almost at the same time point. [ Conclusion] The results provided a reference for prevention and control of tip-burn.
