For soil trace element, the ageing humus had fixed effect. The nascent active humus had effect to promote the activity.

对土壤微量元素，老化的腐殖质有固定作用，新生的活性腐殖质有促进活性作用。

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For soil trace element, the ageing humus had fixed effect. The nascent active humus had effect to promote the activity.

对土壤微量元素，老化的腐殖质有固定作用，新生的活性腐殖质有促进活性作用。

youdao