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北方城郊蔬菜社队种植的大白菜,每年都发生“干烧心”病,损失甚大。据天津市报道,病株球(心)叶的顶端叶缘呈灰白色干边。轻微病株在包心后期才在3～4片顶叶上出现病症;较重病株在包心中期,顶叶有数片褐色卷边;重病株则在半包心时几乎全部顶叶呈褐色卷边;严重病株根本不包心,全部呈干烧状。科学工作者试验研究认为,这种干烧心现象是一种缺钙引起的生理性病害,非现有农药可治。钙是大白菜必需营养
The cabbage planted by the vegetable commune team in the northern suburbs is suffering from “heartburn” every year and has a huge loss. According to reports from Tianjin, the top leaf margin of the diseased ball (heart) leaves shows an off-white edge. Slight strains in the later phase of the package appeared in 3 to 4 parietal lobe disease; heavier diseased plants in the middle of the package, the parietal lobe a few brown curl; seriously ill in the middle of the parcel almost all the parietal brownish-brown volume Side; serious diseased plants did not care, all were dry-burning. Scientific workers pilot studies suggest that this heartburn phenomenon is a physiological deficiency caused by calcium deficiency, non-existing pesticides can be cured. Calcium is a must for Chinese cabbage