The soil is depleted first by crops grown in it and second by bacterial action.

土壤首先被其中生长的农作物消耗，其次被细菌活动消耗。

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Then there’s the state of our soils. Acid rain leaches minerals out of the soil while intensive farming has depleted levels to the lowest in recorded history.

而且，英国的土壤，一方面酸雨把土壤中的矿物质过滤掉了，另一方面密集种植使得土壤中矿物质含有量达到历史以来最低点，几近枯竭。

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For example, cheap forms of irrigation have depleted the water table in many farm areas of India, while at the same time adding near-toxic levels of salts from fertilizers to the soil.

例如成本低廉的灌溉方式已经使印度很多地区的地下水干涸，化肥中高剂量的盐分残留在土壤内。

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The response to depleted soil is to heap on more synthetic fertilizers, which are made primarily with petroleum (not exactly a price-secure resource).

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But wheat yields per acre grew worse if anything as soil nutrients were depleted.

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