Eligibility for admission to M.Tech degree is B.Tech/M.Sc in the discipline. You can find eligibility requirements for various M.Tech programmes from the following links.

(i) http://gate.iitkgp.ac.in/mtech/eara.html
(ii) http://gate.iitkgp.ac.in/mtech/table2.htm
(iii) http://gate.iitkgp.ac.in/mtech/table1.htm
(iv) http://gate.iitkgp.ac.in/mtech/table4.htm

Eligibility for Admission to various branches of M. Tech (Agricultural Engineering) Degree are:

1. Soil and Water Engineering -Bachelor degree in Agril. Engineering / Civil Engineering
2. Farm Machinery and Power-Bachelor degree in Agril. Engineering / Mechanical Engineering
3. Agricultural Process and Food Engineering-Bachelor degree in Agril. Engineering / Chemical Engineering / Mechanical Engineering/ Electrical Engineering
4. Renewable EnergyManagement -Bachelor degree in Agril. Engineering / Mechanical Engineering/ Electrical Engineering

   For GATE eligibility requirement is Bachelor’s degree in Engineering/Technology/Architecture/Pharmacy (which has to be of 4 years) and not B.Sc., but you can just confirm from the institute where you are looking for admission.

   Since most of these institutes also provide M.Sc Agriculture and M.Sc Life Science course, so you can try for M.Sc Ag/ Life Science. And then can purse PhD in any of the agriculture related fields. For PhD eligibility is post graduate degree M.Sc or M.Tech in the related field.

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   Hope this helps
   CareerAge Counselor