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近年来大白菜干烧心病在天津市郊区日趋严重,特别是在秋季干旱的年份尤其严重。在北京、西安、新乡、福州、杭州,以及沿海的大连、连云港等地也有此病,现已成为秋季生产上急待解决的问题。根据我们和本院土肥所对病株、健株含钙量和根际土壤水溶性钙和置换性钙的分析及田间调查,凡是番茄顶腐病(黑膏药)严重的地块大白菜干烧心病也严重等情况,说明此病系生理病害,由钙素不足而引起。发病情况我们的调查方法是把从第一枚真叶开始按叶位顺序加印标号的207株青麻叶大白菜采取逐枚叶片进行剥离的方法,得到49株干烧心病株,从中进行归纳的结果是:发病范围在第24—48叶,发病机率最高的是第30—40叶。开始发病部位是第25—35叶的机率占85%以上。发病方式有三:即在两片至十几片
In recent years, Chinese cabbage dry heart disease is increasingly serious in the suburbs of Tianjin, especially in the autumn drought years in particular. In Beijing, Xi’an, Xinxiang, Fuzhou, Hangzhou, and Dalian, Lianyungang and other coastal areas also have the disease, has now become an urgent problem in the autumn production. According to our and our hospital soil fertilizer on the diseased plants, healthy plants calcium content and rhizosphere soil water-soluble calcium and replacement of calcium analysis and field surveys, all tomato top rot (black plaster) serious block cabbage dry Heart disease is also serious, indicating that the disease is a physiological disease caused by insufficient calcium. The incidence of disease Our survey method is to start from the first real leaves printed in order of leaf order 207 strains of green Chinese cabbage leaf by leaf scraping method to get 49 strains of dried heart disease, which were summarized The result is: incidence in the first 24-48 leaves, the highest incidence is the first 30-40 leaves. The onset of the disease is the 25-35 leaves the chance of more than 85%. The incidence of three ways: that is, two to a dozen tablets