Hey !
Australia and USA are best if you want to study abroad and pursue masters in agricultural Engineering. Some of the top most colleges present around the world (abroad) are :
1) University of Southern Queensland (USQ)
2) Purdue University
3) Universiti Putra Malaysia (UPM)
4) Texas A&M University
5) University of Illinois At Urbana Champaign
6) Pennsylvania State University Park Campus
7) North Carolina State University
8) South Dakota State University
Hope this helps
All the best !