This study was carried out to investigate the effects of soil moisture tension on the growth and leaf temperature of the Kimchi cabbage and develop the crop water stress index (CWSI) for precision irrigation control. Kimchi cabbages were cultivated under different levels (-20, -100, and -500 kPa) of soil moisture tension (SMT). At 60 days after transplanting, the dry matter weight was significantly lower at -500 kPa of SMT than -20 and -100 kPa, however, there were non-significant changes in the maximum leaf length, leaf width, and leaf number among SMT levels. The head weight of the Kimchi cabbage was 60% greater (2,331 g/plant) at -500 kPa than at -20 kPa (1,442 g/plant). The mean leaf temperature of cultivars at -20, -100, and -500 kPa during trial periods was 25.9, 26.5, and 30.6°C, respectively. The CWSI of cultivars at -20, -100, and -500 kPa was 0.0, 0.1, and 1.0, respectively. Results indicated that the growth, leaf temperature, and CWSI calculated from the leaf temperature of the Kimchi cabbage can differ depending on the SMT, and it is possible to develop feasible methods for precision irrigation using the CWSI.
This study was carried out to estimate growth characteristics of Kimchi cabbage cultivated in two different growing seasons and three transplanting dates in the greenhouses, and to create a predicting model for the production of Kimchi cabbage based on the growth parameters and climatic elements. Kimchi cabbages were transplanted three times at intervals of two weeks in spring and autumn growing seasons. Sigmoidal models for the estimation of fresh weight (Fw) was designed with days after transplanting, which were Fw=4451.5/[1+exp{-(DAT-34.1)/3.6}](R 2 =0.992) and Fw=7182.0/[1+exp{-(DAT-53.8)/11.6}] (R 2 =0.979), respectively. The relationship between fresh weight of Kimchi cabbage and growing degree days (GDD) was highly correlated, and the regression model represented by Fw=4451.5/[1+exp{-(GDD-34.1)/3.6}] (R 2 =0.992) in spring growing season. The yield of Kimchi cabbage under spring and autumn growing season were estimated 11348.3kg/10a and 15128.2kg/10a, respectively, which were much different than outdoor culture each growing season, while greenhouse cultivation have shown similar results. To estimate the efficacy of prediction yield in Kimchi cabbage, we will need to supplement a predicting model, which was based on the parameters and climatic elements by the field cultivation.
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