在很多地区，由于工业化肥和农药的持续使用，导致自然土壤的肥力正在下降，然而化肥的流入却导致湖泊中藻类生长得越来越快。
Natural soil fertility is dropping in many areas because of continuous industrial fertiliser and pesticide use, while the growth of algae is increasing in lakes because of the fertiliser run-off.
多年来，坚持合理使用化肥和农药。
For many years, chemical fertilizers and pesticides have been employed on a sound basis.
有效减少化肥和农药的使用量。
Effective decrease of the usage of chemical fertilizer and pesticides.
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