In hilly areas, water pumping irrigation lift is high, and the irrigation water fee is high because of the high pumping cost, so the burdens on farmers are very heavy.
丘陵地区提水灌溉需要的扬程高,水费占灌溉成本的比重大,农民的负担很重。
Often the cheapest way to provide irrigation water in the dry tropics is through small-scale projects, such as gathering rainfall in depressions and pumping it to nearby cropland.
在干旱的热带地区,提供灌溉水的最低成本的方法通常是建造小规模的工程。例如,在洼地收集雨水,然后将其抽调至附近的农田。
Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.
在许多国家,数以百万计的灌溉井现在从地下水源抽水的速度,超过了降雨所能再次填满的速度。
应用推荐