Simulation and evaluation on daily consumptive water use in fields affected by meteorological conditions and soil water content: The case of cabbage fields in Memuro-cho, Hokkaido Prefecture
2014
Arimori, M. (General Incorporated Foundation of Construction Research Institute, Chuo-ku, Tokyo (Japan)) | Hayashi, H.
We estimated soil water content and daily water consumptive use on cabbage fields during the irrigation period for the past 49 years (1964 to 2012) using a soil tank model. The analysis was performed on soil with a thickness of 40cm, and was carried out for two different cases involving a field on which irrigation was practiced and another field that was not irrigated. We performed a multiple regression analysis by assuming the estimated daily consumptive water use as the objective variable, while the explanatory variable was meteorological conditions and soil water content. The degree of influence each explanatory variable had on the daily consumptive water use was evaluated by using a standard partial regression coefficient. It was shown that the degree of the influence that each meteorological element had on daily consumptive water use was the largest with the actual sunshine duration, and decreased in the order of temperature, the wind velocity, relative humidity, and precipitation. It did not vary whether irrigation was practiced or not. It was shown that when irrigation was carried out, the influence that soil water content had was smaller than the relative humidity. In addition, the influence by the soil water content when it was not irrigated was shown to be larger than the actual sunshine duration.
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