merits :-
  - it exposed food cultivation of india by which india gets recover the lack and shortage of demand of food .
 - india became highly agricultured country and also self dependent in food croping 
 - india makes many big stocks of food when natural disaster and wars occurs . 
 - india also became seller of the food to the other countries . 
demerits : -
 - scarcity of water 
 - land gets less and  un-fertiled 
 - fertilizer are used  large amount that also creates land and water pollution in different ways .