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。
Effects of soil sodicity and gypsum application on dynamical behavior of heavy metal elements under effluent irrigation were studied by means of soil column leaching method in laboratory.
采用室内土柱淋洗试验方法，研究了污水灌溉条件下土壤碱度和石膏应用对土壤中重金属元素动态变化的影响。
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