Some of the top colleges for rural management are:
Institute of Rural Management
XIM
TISS
XISS
Amity School of Rural Management
Institute of Rural management

After completing an MBA in rural management, students may be placed with appropriate government owned or sponsored rural development projects, voluntary groups, funding agencies, national or international NGOs.

For MBA in Agriculture colleges in India below are few colleges:

Institute of Agri Business Management, Bikaner
Indira Gandhi krishi Vishwavidhalaya
SIIB

Placements are good too. You can expect on an average a package of approx 3-4 lakhs per annum.

Good Luck.