파종기 이동이 들깨 생태변이에 미치는 영향

Abstract

Four varieties of perilla(Perilla ocimoidsL.) were tested to investigate the ecologicaladaptation of the crop to variations in sowing time extending from April 25 to July 25 withan interval of 30 days between each of the four sowing. As sowing time was delayed, theplant height, the number of first branches and cluster, the weight of fresh and dried stems,the day to germination and flowering decreased, showing a highly negative correlationbetween the showing dates and these characteristics, but a highly positive correlationbetween days to flowering and the required accumulated temperature. With early sowingunder low temperature and long day conditions, it took about 132 days from sowing toflowering due to the long period of vegetative growth, but as sowing was delayed, the days toflowering decreased with a minimum period of 57 days. The yield of seeds in each casevaried with each variety. Type A(Nonsan var.) and type B(Jinchon var.) had higher yieldswhen sowed earlier. But type C(Namyang var. and Wooljin var.) had its highest yield in theplot sowed on May 25 and the 1000 grain weight showed a tendency to increase as sowingwas delayed. In conclusion, the perilla was proved to be a short-day plant that flowers fromthe begining to the middle of Sep. regardless of sowing time, so that the sowing time shouldbe decided after due consideration of the length of the vegetative growth periods of thevarieties.