报告宣称27家苹果供应商有严重的污染问题，从有毒气体到重金属泥渣。

It alleges that 27 Apple suppliers have severe pollution problems, from toxic gases to heavy metal sludge.

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因此，氮肥形态的选择供应可作为控制作物对重金属吸收的一种措施。

Therefore, selection of the forms of nitrogen applied may be considered as an effective measure of controlling uptake of heavy metals by crops.

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