By the time the Ocean Dumping Act took effect, there were companies waiting to convert municipal "bio-solids" into an "effective soil conditioner and natural fertilizer".

海洋倾废法生效后，就有公司等待着将城市“生物固体”转换成为“有效的土壤改良剂和天然肥料”。

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Rice Husk Ash have high silica (SiO2) can be used as raw material in Ceramic Tiles, Replace Cement, Produce Precipitated silica, and raw material for fertilizer and soil conditioner.

稻壳灰含有高二氧化硅(SiO2)，可作为原料瓷砖使用，取代水泥，生产白炭黑，肥料和土壤调理剂的原料。

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But they are also used in the production of fertilizer, garden mulch, and soil conditioner.

NPR: Texas Cotton: 'Farmer Profits at Every Step'