Why do farmers and gardeners often treat soil with ammonia sulphate?
A. To kill harmful insects
B. To reduce the acidity of the soil
C. To increase the nitrogen contents of the soil
D. To increase the oxygen contents of the soil
Answer:C
Why do farmers and gardeners often treat soil with ammonia sulphate?
A. To kill harmful insects B. To reduce the acidity of the soil C. To increase the nitrogen contents of the soil D. To increase the oxygen contents of the soil