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Hi Sanjana,
Every university and country has its own admission requirements. International students must take the IELTS or TOEFL. You may also be required to take the GRE if you are applying to universities in US or any top ranked university. Wageningen University, The Australian National University, Swedish University of Agricultural Sciences, Agro Paris Tech, etc. are some world famous agricultural universities in the world. Free education is not really possible for international students, you have to pay some tuition fee. For affordable options you can check Germany, Poland, Finland, Malaysia and Ireland to name a few. Check also China Agricultural University and Universidade de So Paulo.

Dear Pradip,
B.Tech is a graduation, you have to complete Master or post Graduation level and then M.Phil is also a step, For Ph.D in any stream you have to pass all the steps, you can't apply by doing Graduation. FYI more details:
ADMISSION ELIGIBILITY:
A candidate is eligible for Admission and Registration for Ph.D. programme provided he/ she has qualified:
Masters Degree of any recognised University/other qualification in a relevant field. The minimum qualifying marks are 55% at Post Graduation level (Relaxation of 5% of marks, from 55% to 50%, or an equivalent relaxation of grade, may be allowed for those belonging to SC/ST/OBC/Differently-Able and other categories. )
then In the Entrance Examination conducted by the University at the national level on the pattern of UGC followed by interview.