Waste ash is collected for use as fertilizer for vegetable gardens tended by the students.

学生们收集废灰用作其菜园的肥料。

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Phosphorus is filtered out and stored for use as a fertilizer.

磷被过滤并贮存起来做为肥料。

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Brackett said the use of manure as a fertilizer for produce typically consumed raw, such as spinach, is not in keeping with good agricultural practices.

布兰科特说，用粪便作为主要用于生吃的农产品的肥料，像菠菜，并不是好的农业种植行为。

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For example, as China sought food security, its policies increased fertilizer use.

VOA: special.2009.07.28

Phosphorus is filtered out and stored for use as a fertilizer.

FORBES: Magazine Article

Chemical and fertilizer manufacturers like Dow and Potash, for example, use gas as a fuel and a feedstock.

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After their cotton had been ginned, farmers would keep some of the seed for next year's planting, plow some into the ground as fertilizer, and use the rest to feed their cows.

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