Agriculture is becoming one of the popular courses these days amongst students to pursue higher education.
The Indian Council of Agricultural Research (ICAR) organizes the AIEEEA examination. It is a national level exam organized for providing admissions into UG and PG agriculture programmes.
Some exams are:
BVP CET
AMU 2018
Allahabad University, etc.

Hi,
If you are interested in pursuing PG in Agriculture, you may appear for the ICAR AIEEA. The application form for this year is already out, the last date being 31st May 2018. Check the official website of ICAR regularly for important dates and notifications. Besides, you have not mentioned which state you are from. Some states conduct their own agriculture pg entrance exams.
Good luck to you!