Prediction of Evapotranspiration from Grape Vines in Suwon with the FAO Penman-Monteith Equation
2009
Yun, S.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Hur, S.O., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Kim, S.H., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Park, S.J., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Kim, J.B., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Choi, I.M., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea
Food and Agricultural Organization (FAO) Penman-Monteith (PM) equation is one of the most widely used equations for predicting evapotranspiration (ET) of crops. The ET rate and the base crop coefficients (K∧cb) of the two different grape vines (i.e., Campbell Early and Kyoho) cultivated in Suwon were calculated by using the FAO PM equation. The ET rate of Campbell Early was 2.41 mm day-¹ and that of Kyoho was 2.22 mm day-¹ in August when the leaf area index was 2.2. During this period, the K∧cb of Campbell Early based on the FAO PM equation was on average 0.49 with the maximum value of 0.72. On the other hand, the K∧cb of Kyoho was averaged to be 0.45 with the maximum value of 0.64. The seasonal leaf area index for two grape cultivars was measured as 0.15 in April, 0.5 in May, 1.4 in June, 2.2 in July-September, and 1.5 in October. The K∧cb of Campbell Early showed a seasonal variation, changing from 0.03 in April to 0.11 in May, 0.31 in June, 0.49 in July-September, and 0.33 in October. The magnitudes and the seasonality of K∧cb of Kyoho were similar to those of Campbell Early.
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