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。
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。
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.
以西安市不同灌溉类型的农田土壤为对象，研究重金属污染现状及其与灌溉类型的关系。
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