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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The sewage irrigation still is the major influencing factor on soil trace element variation during the agriculture production.

污水灌溉仍是农业生产中土壤微量元素变化的主要影响因素。

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Therefore, the adjustment of farming according to soil characteristics and local conditions is the key to soil trace element management.

因此，根据土壤性质，因地制宜地采取合理的土壤管理措施，是农业生产过程中改善土壤微量元素管理的关键。

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