土壤有效锌含量低于临界值。

Available zinc in soil was lower than the critical level.

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根据锌肥的经济效益拟定了土壤有效锌利用分区。

According to the economic benefit of zinc-fertilizer, the utilization demarcations of soil available zinc were defined.

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作物种植前的土壤熏蒸或杀菌处理，经常可以增进土壤的锌素供应能力或提高锌的有效性。

Soil fumigation or sterilization before planting a crop frequently improves its zinc - supplying power or zinc availability.

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