Abstract
It is very important factors to control optimal light transmission ratio and soil moisture content in order to produce good quality of ginseng seedling. To study the effect of light transmission ratio (LTR) and soil moisture content(SMC) on growth characteristics and yield of ginseng seedling, LTR was controlled by three level such as 21.2, 24.8% and 30.3%, and SMC was plotted by four level of 11.0%, 12.5%, 15.3% and 18.9% at the greenhouse. Chlorophyll content was gradually decreased in the low LTR (21.2%), while it was distinctly decreased by the decrease of SMC in excessively high LTR (30.3%). The decrease of SMC in the high LTR increased heat injury ratio distinctly, while heat injury ratio in the low LTR was only increased when SMC was very low such as 11.0%. All of fresh root weight per Kan (3.3$m^2$), root weight per plant, and the number of usable seedling were distinctly decreased by the increase of LTR and the decrease of SMC. Excessive increase of LTR in optimal SMC (18.9%) hadn't a great effect on the decrease of root weight, while root weight in low SMC was distinctly decreased by the increase of LTR. Ratio of rusty root was distinctly increased in the condition that both of LTR and SMC were high. Ratio of rusty root in the excessively high LTR was gradually fallen off by decrease of SMC, but its ratio in low SMC didn't changed distinctly by the decrease of SMC.
비닐하우스 내에서 일평균 투광율을 21.2%, 24.8%, 30.3%와 같이 3수준으로, 토양수분을 11.0%, 12.5%, 15.3%, 18.9%와 같이 4수준으로 조절하여 묘삼의 생육 및 수량을 조사한 결과는 다음과 같다. 엽록소 함량은 투광율이 낮은 조건에서 토양수분함량의 감소에 따라 완만히 감소되었으나 투광량이 높은 조건에서 토양수분함량이 낮아지면 엽록소 함량은 현저히 감소되었다.고온장해율은 투광율이 낮은 조건에서 토양수분함량이 11.0%처럼 매우 낮을 때에만 현저히 증가되었지만 투광량이 높은 조건에서는 토양수분함량의 감소에 따라 고온장해율은 급격히 증가되었다. 3.3$m^2$(칸)당 생근중, 주당 생근중 및 사용가능묘삼수는 투광율이 증가되고 토양수분함량이 감소될수록 뚜렷이 감소되었는데, 토양수분함량이 적절한 조건(18.9%)에서는 투광율이 증가되어도 묘삼수량의 감소는 적었으나 토양수분함량이 부족한 조건에서는 투광율이 증가될수록 묘삼수량은 현저히 감소되었다. 적변율은 투광율이 높고 토양수분함량이 많을 때 현저히 증가되었는데, 투광율이 높은 조건에서 토양수분함량이 감소되면 적변율도 차차 감소되었으며, 투광율이 낮은 조건에서 적변율은 토양수분함량에 따라 큰 변화를 보이지 않았다.
