들깨 4품종을 4월 25일부터 30일 간격으로 7월 25일까지 4차에 걸쳐서 파종하여 각 파종기에 따른 생태변이를 조사하였다. 파종기가 늦어짐에 따라 초장, 1차분지수 착화방수, 생체중, 건물중, 발아요소일수 및 개화소요일수가 감소되는 경향을 보임으로서 파종기와 이들 형질간에 높은 부의상관 및 개화소요일수와 소요적산온도 사이에는 높은 정의상관관계를 보였다. 저온, 장일조건하에 조기파종하면 영양생장이 길어서 개화기까지 약 132일이 소요되고, 그 후 파종은 점차로 단축되어 불과 57일만에 개화를 볼 수 있다. 파종기에 따른 종실수량은 품종에 따라 다르다. 즉 A형(논산종)과 B형(진천종)은 조기파 종할수록 수량이 많았고, C형(남양종과 울진종)은 5월 25일 파종구가 가장 많았다. 1000립종은 파종기가 늦을수록 무거워 지는 경향이었다. 이상의 결과로 보아, 들깨는 단일성작물로서 파종기 여하를 막론하고 9월상~중순까지 개화함으로 품종에 따라 충분한 영양생장기간을 고려하여 파종하여야 한다.

Four varieties of perilla(Perilla ocimoids L.) were tested to investigate the ecological adaptation of the crop to variations in sowing time extending from April 25 to July 25 with an interval of 30 days between each of the four sowing. As sowing time was delayed, the plant 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 correlation between the showing dates and these characteristics, but a highly positive correlation between days to flowering and the required accumulated temperature. With early sowing under low temperature and long day conditions, it took about 132 days from sowing to flowering due to the long period of vegetative growth, but as sowing was delayed, the days to flowering decreased with a minimum period of 57 days. The yield of seeds in each case varied with each variety. Type A(Nonsan var.) and type B(Jinchon var.) had higher yields when sowed earlier. But type C(Namyang var. and Wooljin var.) had its highest yield in the plot sowed on May 25 and the 1000 grain weight showed a tendency to increase as sowing was delayed. In conclusion, the perilla was preyed to be a short-day plant that flowers from the begining to the middle of Sep. regardless of sowing time, so that the sowing time should be decided after due consideration of the length of the vegetative growth periods of the varieties.

• 박종선 | Park, Jong-Sun