Q. Consider the following statements:

1. Arable land in the irrigated zones of India is becoming saline because of overirrigation.
2. Chemical fertilisers in the absence of organic manures are harmful to the soil.
3. Unless the soil gets enough humus, chemicals harden it and reduce its fertility in the long run.

Which of the above conditions prevail in areas that were first beneficiaries of the Green Revolution?
Answer: All of the above
Notes: A fairly large area of arable land in the irrigated zones of India is becoming saline because of overirrigation. The salt lodged in the lower profiles of the soil comes up to the surface and destroys its fertility. Chemical fertilisers in the absence of organic manures are also harmful to the soil. Unless the soil gets enough humus, chemicals harden it and reduce its fertility in the long run. This problem is common in all the command areas of the river valley projects, which were the first beneficiaries of the Green Revolution.