Other scientists have looked at materials like leaf compost or manure, while Professor Brown favors composts high in iron content, like the sludge from wastewater treatment.
其他科学家们寄希望于树叶堆肥或粪肥一类的物质，而布朗教授更偏爱铁含量较高的堆肥，例如来自废水处理过程中的污泥。
The dewatered sludge is used as manure and fuel.
被脱水的烂泥使用作为肥料和燃料。
The amount of plant biomass increase with the increase of fertilizer, using manure can increased aboveground biomass of white clover significantly, but sludge fertilizer is better on tall fescue.
植物生物量基本上是随着施肥量的增加而增加的，施加农家肥对显著提高白三叶地上生物量，但是污泥肥对高羊茅的效果更好。
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