Effect of Soil Water Content on Growth, Photosynthetic Rate, and Stomatal Conductance of Kimchi Cabbage at the Early Growth Stage after Transplanting
2017
Kim, S.K., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Lee, H.J., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Lee, H.S., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Mun, B., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea | Lee, S.G., National Institute of Horticultural and Herbal Science, Wanju, Republic of Korea
The objectives of this study were to determine the impact of soil water content on the growth, stomatal conductance, and photosynthesis of Kimchi cabbage and to evaluate proper parameters for development of growth models. There were five levels of irrigation amount treatments (0, 200, 300, 400, and 500 mL/d/plant) and those were commenced at one day after transplanting (DAT). We measured soil water content, stomatal conductance, photosynthesis characteristics, and the A-Ci curve. The growth of Kimchi cabbage as affected by irrigation amount was evaluated at 38 days after transplanting, however, the growth with 0 and 200 mL/d/plant irrigation amount treatments measured at 29 DAT. The relationship between soil water content and stomatal conductance was highly correlated (r² =0.999) and the function represented by y = 6097.4x − 4.2984. The stomatal conductance of Kimchi cabbage leaves showed 300 mmolㆍm-²ㆍs-¹ when the soil water content was below 0.05 m3 /m3 . The stomatal conductance was rapidly decreased by scarcity of soil moisture. A-Ci curve indicated normal curve in fully irrigation treatment (500 mL/d/plant), however, CO₂ couldn’t diffuse through the intercellular Kimchi cabbage leaves treated with 0 mL/d/plant. The dry weight of full irrigation treatment was greater approximately 6.8 times than that of deficit irrigation (0 mL/d/plant). In addition, leaf area index showed a logarithmic function (y = 16.573 + 3.398 ln x) with soil water content and that of R-squared represents 0.913. Results indicated that the soil water content was highly correlated with stomatal conductance and leaf area index. Indeed, the scarcity soil moisture reduced photosynthesis and retarded growth.
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