8 12 8 16.2004 1 2 The Effect of Planting Time and Mulching on Chinese Cabbage which to be Harvested from January to February Hitoshi KIMURA,Makoto MIYAGI and Masahito SUZUKI Summary In the cultivation of Chinese cabbage that can be harvested from January to February by simple head binding only,the effect of growth promotion and cold resistance improvement by an earlier or later planting time and mulching was examined. 1.For the cultivation of Chinese cabbage that can be harvested from January to February,mulching is an effective measure for growth promotion,but an ineffective measure for quality promotion and cold resistance improvement. 2.Mulching is an effective measure for a variety of Chinese cabbage that has cold resistance and low temperature enlargement in late planting. In the cultivation of Chinese cabbage that can be harvested in February, high quantity and quality are expected with 'Hatsuwarai' for multing and planting around September 20. 3. After the optimal harvesting stage, Chinese cabbage in fields that are cold protected by simple head binding only lack resistance to cold. Therefore in the cultivation of Chinese cabbage that can be harvested in February, care should be taken to prevent over promotion of growth before a severe winter season. 11 3,590ha( 653ha) (2) 1 2 1 2 (1,8)
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