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CHINESE CABBAGE
Physiological Disorders

Chinese cabbage normally completes its life cycle during the first year of growth. Bolting refers to the premature production of seeds on plants. When plants of Chinese cabbage bolt, heads of undesirable size and/or quality normally result. Studies have shown that the bolting response in Chinese cabbage is under genetic control, with certain cultivars being more prone to bolt than others. Several environmental factors have been associated with bolting in Chinese cabbage. For example, young plants exposed to low temperatures for extended periods during early spring have a high probability of bolting during the higher temperatures and longer day lengths of midsummer. Short days with near optimal growing temperatures will tend to keep plants in the vegetative phase of development. Factors which cause a check in plant growth, such as nutrient deficiencies, may also induce bolting.


It is not certain that tipburn in Chinese cabbage is similar to the tipburn observed in lettuce and cabbage. The symptoms are brown and black necrotic areas on the leaf margins of external and internal foliage. In lettuce this disorder has been attributed to factors which affect the water status and the calcium and/or boron nutrition of the plant. Chinese cabbage cultivars which appear to possess tolerance to tipburn are available. 

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