Abstract
Background: The biological responses of crops can be more accurately studied by measuring leaf temperatures instead of monitoring the surrounding atmospheric temperatures. This study analyzed the correlations between ginseng leaf temperatures and microclimate factors to determine the optimal light transmittance rate of shading.<BR>Methods and Results: The correlations between the ginseng leaf temperature and microclimate factors, such as the light intensity and temperature within the shading structure, were analyzed at light transmittance rates of 10% and 6%, and changes in leaf colorization, photosynthetic efficiency rates and root weights were measured. The rise in the leaf temperature was significantly positively related to the internal temperature, while the rise in the internal temperature was significantly positively related to the light intensity outside the shading structure. The colorization degree and photosynthetic rate of leaves were 36.3 and 1.948 μ㏖·m<SUP>−2</SUP>·s<SUP>−1</SUP>, respectively, at 6% light intensity, and 26.1 and 1.730 μ㏖·m<SUP>−2</SUP>·s<SUP>−1</SUP>, respectively, at 10% light intensity, equating to an 8.6% increase in the root weight at 6%.<BR>Conclusions: To lower ginseng leaf temperatures and increase their photosynthetic rate and root weight, the amount of light transmitted inside the shading structure should be adjusted to 6%.
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