“腐殖质”的英语？

蚯蚓吃下大量土壤，排出肥力丰富、物理结构理想的腐殖质。Earthworms consume large amounts of soil, and produce a rich humus, perfect in texture.有机物分解的最后程序称为腐殖质化.The final process in organic matter decomposition is known as humification.腐殖质是已知能够覆盖滤膜的物...