Many Communities Are Beginning to Use Sludge on Farm Fields

question 26

Multiple Choice

Many communities are beginning to use sludge on farm fields.What is the biggest problem with using sludge on fields?

• A)The sludge must be dried before it can be applied to the fields.
• B)Wet sludge may irrigate the crops.
• C)Sludge is often contaminated with toxic metals that could be taken up by plants.
• D)Sludge is a source of nutrients and humus.

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