2, 4-D의 경엽처리가 인삼의 지상부 생육 및 광합성능력과 식물체의 Ethylene gas 발생등의 생리적특성에에 미치는 영향을 구명하기 위하여 본 실험을 수행하였던 바 그 결과를 요약하면 다음 과 같다. 1) 표준약량의 3배농도 2, 4-D 경엽처리시에도 엽장, 엽폭, 경장 및 경직경등 지상부 생육은 무처리와 전혀 유의차를 나타내지 않았으며 별다른 생육이상현상도 나타내지 않았다 2) 무처리구에 비해 2, 4-D의 경엽처리시 줄기에 대한 엽병의 각은 현저히 커졌으며 2, 4-D 처리농도가 증가될 수록 엽병각은 거의 직선적인 증가경향을 나타내었다 3) 2, 4-D의 경엽처리에 의해 인삼잎의 광합성능력은 현저히 저하되었으며 그 정도는 2, 4-D 처리농도를 증가함에 따라 현저히 크게 나타났다. 4) 2, 4-D의 경엽처리에 의한 인삼잎의 광합성저해현상은 표준 및 2배 농도 처리구에서는 처리후 3일에 정상으로 회복되었으나 3배 농도구에서는 처리후 12일 이후에 거의 회복단계가 되었다. 5) 표준 및 2배 농도의 2, 4-D 처리구에서는 무처리구와 같이 전혀 Ethylene gas의 발생을 측정할 수 없었으며 3배 농도 처리구에서만 미량의 Ethylene gas가 정량되었으나 이는 표준약량의 2, 4-D를 처리한 중에서 발생된 Ethylene gas 량의 1/20에 불과하였다.

This study was conducted to define the effect of 2, 4-D foliar application on the plant growth. photosynthesis ability and ethylene gas production of the ginseng plant. Neither abnomal foliar changes occured nor any inhibition in the leaf and stem growth was resulted for the plants treated with 2,4-D concentrated three times of the recommended dosage. The angle of petiole to the stem became wider by 2, 4-D foliar application. The higher concentration treatment of 2,4-D made the petiole angle significantly wider. Foliar application of the herbicide 2,4-D inhibited photosynthesis of the ginseng leaf. The inhibition rate of photosynthesis was significantly increased with the application concentration of 2, 4-D. Inhibition in photosyn-thesis ability by 2,4-D application with doubled concentration was recovered in three days after treatment. When 2,4-D was treated with a concentration tripled the recommended dosage, 12 days were needed to recover the photosynthesis ability of the ginseng leaf. Ethylene gas was not detected from the ginseng plants treated with 2 times concentrated 2, 4-D. However, the ginseng plants produced 0.03-0.04 ppm ethylene gas when the application rate was increased 3 times. The amount of ethylene gas produced by ginseng plant treated with 3 times concentrated 2, 4-D was only 1/20 compared with the amount produced by the soybean plant treated with the recommended dosage of 2, 4-D.

• 曺在星(충남대학교 농과대학) | 조재성
• 元俊淵(충남대학교 농과대학) | 원준연
• 辛崔順(충남대학교 교육대학원) | 신최순