Relationship between environmental conditions and the growth of ginseng (Panax ginseng C.A.Meyer) plant in field, 3; Field photosynthesis under different light intensity
1987
Lee, S.S. | Cheon, S.K. | Mok, S.K. (Korea Ginseng and Tobacco Research Inst., Jeungpyeong (Korea R.))
Changes of light intensity under above shading materials were measured at different relative light intensity (R.L.I. 5% of common straw shading, 15% of polyester shading and 20% of polyester shading at 12 o'clock on clear day) and lines (1st, 3rd and 5th lines)on clear and cloudy days in 5-year-old ginseng plant populations. Rates of photosynthesis and respiration, microclimate and root yield were also measured in field. Air temperature of R.L.I. 5% was 2 deg C lower compared with R.L.I. 15% and 3 deg C compared with R.L.I. 20% from 12 to 14 o'clock on clear day, but there were no difference among R.L.I. on cloudy day. Relative humidity of R.L.I. 5% was 5% higher compared with R.L.I. 15%, and 8% higher compared with R.L.I. 20% from 10 to 141114 o'clock on clear day. but there were not different among R.L.I. on cloudy day. Light intensity was below 5,000 lux at R.L.I. 5%, about 15,000 lux at R.L.I. 15% and about 20,000 lux at R.L.I. 20% from 10 to 15 o'clock on cloudy. Photosynthetic rate of R.L.I 15% and R.L.I. 20% were higher compared with R.L.I. 5% on clear and cloudy days. Total photosythesis in a day was increased by R.L.I. 5%, 20%, 15% in turn on clear and cloudy d
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