Investigations of the realities of greenhouse water use for irrigation project planning

本研究的目的是调查温室用水的实际情况及其对灌溉规划的影响。为了实现这一目标，对温室和周围高地的实际用水量进行了检查。测定了温室内外的微气象条件和土壤含水量，并根据微气象数据估算了部分植物的需水量。试验内容如下：1）测定了冈山县的大豆市地区（即蛋用植物）和鸟取县的大荣町地区（即西瓜）的温室内外的微气象条件。同时，对温室内土壤含水量和灌溉量进行了测定，并与气象观测结果进行了比较，证实了温室内温度高、太阳辐射低的事实。利用气象数据 ...更多信息 在温室内，用Penman方程估算茄子和西瓜的蒸散量。所得结果与温室水分平衡估算的蒸散量相当吻合。结果表明，Penman方程可以较准确地估算温室内的水分利用。2）本研究收集了鸟取县东北町（草坪田）和大荣町（西兰花田）的微气象资料。3）调查了东北灌溉工程区（即鸟取县东北町和大荣町）的实际用水情况。这涉及比较该地区农场池塘每小时的排放量和农场一级的用水量。此外，还编写了一份调查问卷，调查农场一级与作物种类有关的用水情况。调查显示，农场池塘的最高流量是在早晨和晚上。然而，这并不妨碍农场池塘的运作和维护。此外，从农场池塘的排放量波动与降雨量，其中更多的水是在长，清晰，干燥的日子。施水的时间、量和方法也因作物种类的不同而不同，也因作物是在温室中还是在露天田地中生长而不同。少

The objective of this study was to investigate the actual situation of greenhouse water use and its implications for irrigation planning. To achieve this actual water use in both the greenhouse and the immediate surrounding uplands fields were examined. The micrometeorological conditions and the soil moisture content within and outside the greenhouse were measured, and from the micrometeorological data the estimation of the water requirements of some plants were estimated.The experiments conducted are as follows :1) The micrometeorological conditions within and outside the greenhouse at Soja City area (i.e.Egg Plant), Okayama Prefecture, and Daiei Town area (i.e.water melon), Tottori Prefecture, were measured. Also, the soil moisture content and irrigation amount within the greenhouses was measured.In comparing the results the meteorological measurements, the fact that the temperature was high with solar radiation being low within the greenhouse was confirmed. Using meteorological data … More of the greenhouse the Penman equation was used to estimate evapotranspiration of the egg plant and water melon. The results obtained compared fairly well with evapotranspiration estimated from the water balance of the greenhouse. It was concluded that the Penman equation can be used to estimate water use in a greenhouse with a fair degree of accuracy.2) In this study micrometeorological data was collected at Tohaku town (i.e.lawn field), Tottori Prefecture, and Daiei Town (i.e.Broccoli field). Also, soil moisture content and rainfall amount were measured.3) The actual water use situation in the Tohaku Irrigation Project district (i.e.Tohaku town and Daiei town, Tottori Prefecture) was investigated. This involved a comparison between the hourly discharge from farm ponds in the area and the water use at the farm level. Also, a questionnaire was prepared to investigate water use at the farm level in relation to the kind of crop.The investigations revealed that the peak discharge from the farm ponds was in the morning and evening. This, however, did not interfere with the operation and maintenance of the farm ponds. Also, the amount of discharge from the farm pond fluctuated with rainfall amount in which more water was used during long, clear, dry days. The time, amount, and method of water application also differed with respect to the kind of crop, and with respect to whether crops were grown in greenhouses or in the open field. Less