n.腐殖質(zhì)
When the humus has been formed, plants can grow well in it. 一旦腐殖土形成，植物就可以在里面茂盛地生長了。
Humus is dead, decaying organic matter. NOT inorganic fertilizer. 腐殖質(zhì)是已死的、腐爛中的有機(jī)物質(zhì)。而不是無機(jī)肥料。
