This study was performed to investigate the effects of sowing density and number of seeds sown on the emergence rate and growth characters of Panax ginseng C. A. Meyer under direct sowing cultivation in a blue plastic greenhouse. Ginseng seedlings, derived from seeds sown directly at different densities (90, 108, 135, and 162 seeds per 162m2), were cultivated in sandy loam soil within a blue plastic greenhouse. In contrast to the emergence rate, which decreased with an increase of sowing density, number of survival plant showed an increasing trend. Interestingly, the emergence and number of survival plant were significantly enhanced when 2 or 3 seeds were sown per hole compared with when one seed was sown per hole. Growth of the aerial parts of ginseng were not markedly influenced by sowing density or the number of seeds sown. However, chlorophyll content (SPAD values) increased with an increase in sowing density. Root parameters, such as root length, diameter, and weight, and the number of lateral roots decreased with an increase in sowing density, but were not noticeably influenced by the number of seeds sown. Total saponin content was the highest in the treatment plot containing 135 seeds. Similarly, the content of each ginsenoside was also tended to be higher in this treatment than in other treatment plots. On the basis of the results obtained in this study, it was possible to determine the optimal sowing density and seed number for the direct sowing cultivation of ginseng in blue plastic greenhouse.

벼 담수직파재배에서 적정 파종양과 입모수 설정을 위하여 낙동벼와 삼강벼를 공시하여 5월 4일 작물시험장 답작포장에서 파종양을 달리하여 시험한 결과를 요약하면 다음과 같다. 1. 공시품종 모두 파종양이 증가할수록 최고분얼수는 많아졌고 유효경비율은 저하하였다. 2. 공시품종 모두 파종양이 증가할수록 유효분얼한계기는 앞당겨지는 것으로 나타났으며 3. 5kg/10a 파종구의 유효분얼 한계기는 6월 18일 전후이었다. 3. 단위면적당 수수는 공시품종 모두 파종양이 증가할수록 많아졌다. 수당영화수는 낙동벼에서는 파종양의 증가에 따라 차이가 없었으나 삼강벼에서는 감소하였다. 4. 파종양이 증가할수록 낙동벼의 등숙률은 떨어 졌으나 삼강벼에서는 차리가 없었다. 5.m2 당 적정 입모수는 삼강벼에서는 120개 정도, 낙동벼에서는 78개 정도이었으며 파종양으로 볼 때 삼강벼는 4kg /10a, 낙동벼는 2.7kg /10a 정도가 적당하였다.