การตอบสนองทางสรีรวิทยาของโสมเกาหลีอายุต่างๆต่อความเข้มแสงและความเข้มข้นของก๊าซคาร์บอนไดออกไซด์

Abstract

Main objectives of this study are to find out the optimum light intensity and carbondioxide concentration for growing ginseng (Panax ginseng C.A. Meyer) on highland of northern Thailand. Ginseng plants at the age of 1 year, 2 years and 3 years were completely randomized into 9 treatments with split plot design. The result revealed that light intensity at 6,000 lux and 10,000 lux significantly decreased plant growth period and chlorophyll content of leaves when compared to at 4,000 lux. Increased light intensity, however, promoted a higher Total Nonstructural Carbohydrate (TNC) accumulation in leaves and roots. Plants of all the three ages responses to light intensity similarly.          

Increase of carbondioxide concentration from ambient level (180-250 ppm) to 600 and 1,000 ppm increased plant growth period in 1 year- and 2 year- plants and also significantly increased TNC accumulation in roots.

The most appropriate conditions for growing ginseng in northern Thailand are carbondioxide at 600 ppm plus light intensity at 6,000 lux. Under this conditions plant growth period was slightly shortened but TNC in root was the highest.