How do you test the acidity of soil?

你怎样测试土壤的酸度？

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The manure decreases the acidity of soil, creating an environment ideal for the bacterial degradation.

鸡粪能减少土壤的酸性，创造出细菌降解的理想环境。

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But even this method runs the risk of altering the acidity of soil or Marine ecosystems unless precautions are taken with disposal.

但是即便这种方法也面临着改变土壤酸性或海洋生态系统的风险，除非采取处理的预防措施。

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First, it poured industrial quantities of lime (pulverised limestone or chalk) onto the soil to reduce levels of acidity.

ECONOMIST: Brazilian agriculture