【摘要】 <正> 目前,在我国一些大白菜(Brassica ssp.pekinensisc)主产区中,大白菜干烧心病时有发生,严重地影响了大白菜的品质和产量。由于生理原因造成大白菜干烧心病发生的情况,已被近些年的试验研究所证实。从大量数据中可以明显地看出该病的发生和发展,与土壤的理化性状、施肥技术等有密切的关系。根据我们1981-1983年的试更多还原

【Abstract】 The relationship between tipburn in Chinese cabbage（Brassica ssp. pekinensis）and the chemical properties and fertilizing methods in different type of soils was investigated. The results indicated that the incidence and index of infection of tipburn in the N-fertilizer-applied plot were 75% and 106% higher than that in the control. The infection index was significantly in the plots with rational application of N-P-K than in plots where only N was overapplied. There was also a significantly positive correlation （0.4542） between the incidence and salt content in the soil. The average salinity in the infected soil was 0.232%, while that in the clean soil was 0.128%. The quantity of ion exchange and uneven movement of ion were found to be the other important factors affecting the occurrence of this disease in South China where the soil has a high leachability with low salinity. High Cl^- ,K⁺ and Na⁺ contents in the soil influence Ca⁺⁺ absorption by plants. Ca content in the diseased plants decreased by 31.9%, and the ratio of Ca to N was lower in comparison with that in the uninfected plants.更多还原