Studies on the maturity of the supplementary upland field irrigation in the wet area.

有一种观点认为利用雨水可以节省旱地灌溉的费用。设计年（每十年一年）的有效降雨量为零的灌溉期。因此，我们不能削减农业用水设施的能力，如农场，洒水车，水泵等。但是我们可以减少热源的体积。据调查，很少有农业区对旱地的要求超过每天5毫米。如果旱田需求量减半，则旱田灌溉费用减少到33%。但是，在温室园艺流行的地区，不能减少对田地的需求。沙质土壤地区也是如此。如果将砂土与吸水聚合物混合，则吸水性高。因此，可以减少沙质土壤的田间需要量。但对壤土的需要量不能减少。东北地区农民将旱地灌溉用于除苹果以外的其他水果的病虫害防治。他们也用它来清洗农用机械和蔬菜。一天的需水量是两个三角形。如果安全系数为1.5，则每公顷农田的体积为20 m^3。

There is the opinion saves the expense of the upland field irrgation with the use of the rain. It is irrigation period that the effective rainfall is zero in the whether of the design year, which is one year per ten years. So, we can not cut down the ability of agricultural water facilities, such as farmpond, sprinkler, and pump etc. But we can cut down the volume of reserviors. There are few agricultural areas which upland field requirements are over 5 mm per day by investigations. If the upland field requirement is half, the expense of the upland field irrigation is reduced to 33%. But the areas where green house horticultures are in popular can not reduce it's field requiremants. And areas in sandy soil are too. If it mixes the sandy soil and polymer which absorvs water, it's absorption of water becomes the high grade. So, the field requirement of sandy soil can reduce. But the field requirement of loam can not reduce. Farmers in Tohoku district use the upland field irrigation to the disease and pest control of fruits except apple. They use it to the cleaning of farm machines and vegetables too. The pattern of the water requirement in one day is two triangles. If the safety factor supposes 1.5, the volume of farmpond is 20 m^3 per 1 ha.