Discussion
Which of the following is not an advantage of using manure over fertilizers ?
Answer: C
The statement that is not an advantage of manure is it fixes atmospheric nitrogen.
Nitrogen fixation, turning nitrogen gas from the air into compounds plants can use, is done by microorganisms such as Rhizobium in the root nodules of legumes and by some free-living bacteria and blue-green algae, and by lightning. Manure itself does not fix nitrogen; it returns nutrients already in the plant and animal waste.
The other three are real advantages of manure over fertilizers: its humus makes the soil porous and loose, it adds to and feeds the useful soil microbes, and it improves the soil's water-holding capacity. Chemical fertilizers supply nutrients but do none of these.
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