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Dear student,
Please find below the answer:

7. Differences are as follows:

Manure	Fertilizer
Manures are relatively less rich in plant nutrients.	Fertilizers are very rich in plant nutrients like nitrogen, phosphorus, and potassium
Manure would be better in the long run because manure contain organic materials	Fertilizers contain chemical substances which when used in excess become harmful to the consumers
Do not cause water pollution	Fertilizer runoff from the fields also causes water pollution.
It is not costly	It is costly

Hope this clears your doubt.
Regards.