Study on the water consumption of Chinese cabbage by floating lysimeter.
1987
Kim S.W. | Kim S.J. | Kim J.S.
This study was fulfilled by the floating lysimeter method at the experimental farm of Konkuk University from August to November of 1986 to investigate the amount of evapotranspiration in the growing periods, evapotranspiration ratio, amount of watering per unit of time, days of intermission, soil moisture extraction pattern and crop coefficient of the Chinese cabbage cultivated in the sandy loam soil at the watering point of pF2.0. The total evapotranspiration during the growing period was 267.2 mm, which was 3.99 mm by daily average, and the maximum evapotranspiration showed in the mid ten days of September with the value of 5.81 mm/day. The evapotranspiration ratio of the growing stages increased from the last ten days of September and showed maximum in the beginning of October, and the average evapotranspiration ratio was 1.4. The days of watering intermission at the watering point of pF 2.0 was 2.4 days, and the average yield per plant was 3,228 g. The soil moisture extraction pattern in the initial stage was 78.9% in the 1st and 2nd soil layer and 21.1% in the 3rd and 4th layer, and the mid-season stage, the moisture extraction proportion of the under layer accounted for 38.8% which showed that the root elongated to the lowest soil layer. The average crop coefficient (Kc) of the tested crop during the growing period was 0.67 by Penman equation and 2.36 by Pan-evaporation equation, which showed high difference by the calculation methods, and the changes of crop coefficient by the growing stages by Penman equation was more favorable than those calculated by other methods.
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