Horticultural Science and Technology ISSN:1226-8763(Print) 2465-8588(Online) 원예과학기술지

Tipburn occurs occasionally in Kimchi cabbage, and lowers quality and yield. This study was carried out to understand the causes and reduce the occurrence of tipburn. Daily calcium uptake increased rapidly at the heading time when Kimchi cabbage biomass increased. Tipburn occurred when Kimchi cabbage was hydroponically cultured for over 24 hours in calcium-deficient nutrient solution, and occurred on leaves ranging from the 20th to 50th leaf from the outer leaf. Calcium content was lower in inner leaves than in outer leaves, and was lower at the leaf margins than in the middle part of the leaf. Tipburn was more sensitive to soil drying than to saturated soil. In the 70/100% day/night relative humidity (RH) treatment, tipburn did not occur at all, and in the 50/100% RH treatment, it appeared mildly at the initial stage and recovered. In the 40/80% RH treatment, in which the RH was kept low during the day, tipburn occurred severely, and in the 20/40% RH treatment, in which the RH was kept very low during the day and night, the leaves were shriveled, but tipburn did not occur. It seems that the occurrence of calcium deficiency can be reduced by increasing the humidity at night while managing sufficient soil moisture in highland Kimchi cabbage.