Effect of Time and Number of SADH Application on Head Formation of Chinese Cabbage Grown During Summer Season

บทคัดย่อ

The effect of SADH on Chinese cabbage (Brassica pekinensis cv. Tienjin # 23) grew during summer was studied in relation to head formation.SADH at 2,000 ppm was applied by foliar appli¬cation to Chinese cabbage after transplanting 20, 25, 30 and 35 days for 1, 2, 3 and 4 times at 5 day¬ interval. It was found that head weight of Chinese cabbage was maximally increased up to 41.67 % over the control, when one SADH application was given to Chinese cabbage after they had been transplanted for 30 days. The effect of SADH on the number of inner leaves, outer leaves, lateral shoots, length of core and chlorophyll content was discussed in relation to mechanism of SADH on heading of Chinese cabbage.