I need to know whether contract farming should be promoted for the upliftment of farmers or farmers should be brought to a competitive market and let them to compete with other big players?
There is a small piece by me on my page, that you may find useful, though it is a little dated. Poultry Farming in Integration mode has worked well. Most others have not. Pepsi's potato contract farming has had mixed results.
You may conduct a google search using contract farming, India, vegetables, fruits, poultry and dairy as key words. This should generate publications and data as you require.