Abstract
Two kinds of furrow irrigation methods of upland field converted from paddy field have been performed. One of them is a temporary furrow irrigation for crop plants needed soil with good drainage and water holding, and the other is a full water furrow irrigation for crop needed soil with high moisture. However, lately, crop wanted to soil with high moisture is cultivated by repeating an intermittent flooded furrow irrigation in the fields with low groundwater level or difficulty in continuos flooding by low impermeable function of plow-soil depend on continuous cropping. Accordingly, to clear the present conditions of water usage of the intermittent flooded furrow irrigation, we studied the water management conditions in a case of an open culture of eggplant. The conditions of plow-soil, the irrigation interval, the soil moisture tension at the beginning of flooding, the irrigation requirement and the irrigation efficiency of upland field converted from paddy field were investigated.
