Crop yields are painfully low, but improving production of staples demands emissions-heavy fertilizer and irrigation technologies.
作物产量低得可怜，但若想提高粮食产量，就需要使用排放严重的肥料和灌溉技术。
2
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。
3
The pollution levels of heavy metals and the relations between they and irrigation types was studied in top soils of different irrigation types in Xi an City.