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。
In Haihe Lowland Plain, water shortage is the main limit factor for agriculture production.
海河低平原类型区，水资源不足是农作物产量的主要限制因子。
In Haihe Lowland Plain, water shortage is the main limit factor for agriculture production.
海河低平原类型区，水资源不足是农作物产量的主要限制因子。
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