tell me history of Indian agriculture.and why we need of second green revolution?

Answer 1

Arya entered India,settled in basins of North Indian rivers.Good fertile land,plenty of water lead them to sow food grains.As population growth in geometric proportion,there is need to increase food production.Most of the time India imported food grains up to eighties.Thus started first green revolution.Extensive use of fertilisers and chemicals enhanced production,but its ill effects on health and environment has forced to start second green revolution