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。
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。
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。
The measurement of trace elements in water samples is a fundamental laboratory work for element transport in both soil and runoff.
水样中微量元素的测定是研究元素迁移的一项基础工作。
The measurement of trace elements in water samples is a fundamental laboratory work for element transport in both soil and runoff.
水样中微量元素的测定是研究元素迁移的一项基础工作。
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