Here are some info
Detailed rules can be fund here
Reserve bank of India website
Reserve Bank of India
Specific Question answered
Q.2. Whether NRI/PIO can acquire agricultural land/ plantation property / farm house in India?
A.2. No. Since general permission is not available to NRI/PIO to acquire agricultural land/ plantation property / farm house in India, such proposals will require specific approval of Reserve Bank and the proposals are considered in consultation with the Government of India.
Q.13. Can an agricultural land / plantation property / farm house in India owned / held by a non-resident be sold?
A.13. (a) NRI / PIO may sell agricultural land /plantation property/farm house to a person resident in India who is a citizen of India.
(b) Foreign national of non-Indian origin resident outside India would need prior approval of Reserve Bank to sell agricultural land/plantation property/ farm house in India
Q.15. Can an NRI / PIO / Foreign national holding an agricultural land / plantation property / farm house in India gift the same?
A.15. (a) NRI / PIO can gift but only to a person resident in India who is a citizen of India.
(b) foreign national of non-Indian origin needs prior approval of Reserve Bank
Q.31. Can a person who had bought immovable property when he was a resident, continue to hold such property even after becoming an NRI/PIO?
A. 31. Yes, he can continue to hold the residential / commercial property / agricultural land/ plantation property / farm house in India without the approval of the Reserve Bank.