Field trials were made on winter wheat, maize and rape, the results show a sharp yield increase by the application of these sludge fertilizers.

加工复合微生物肥料。对试制的污泥肥进行冬小麦、玉米、油菜施肥试验，结果表明污泥肥可使作物大幅度增产。

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Cement flying dust decreased the yield of rice and rape at some farmlands, but did not produce harmful effect on its quality. There was an obvious increase in calcium content in polluted soil.

水泥粉尘使一些农田水稻和油菜产量有所下降，但对质量未产生不良影响，水泥粉尘会使土壤中钙的含量明显增加。

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Field trials show: compared with common NPKs, specialty fertilizers increase the yield of wheat by 5.9%, rape seed by 7.2%, rice by 7.3%, vegetable by 9.1%, and the application frequency is decreased.

田间试验表明：施用腐植酸系列专用肥与普通复混肥相比，小麦平均增产7.2%，油菜平均增产7.2%，水稻平均增产7.3%，蔬菜平均增产9.1%，且可减少施肥次数。

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