Engineering is a field of science that is governed by mathematics and physics on a equal level. Without mathematics is would be very much difficult for a basic understanding of this subject. Hence for engineering mathematics plays an important role.

Same for Agricultural Engineering too , students must have passed  in 10+2 from a recognised educational board with physics, Chemistry and mathematics as a compulsory subjects.

This rule is for majority of engineering subjects except for biotechnology.

So I am afraid to tell you are not eligible for agricultural engineering , however you can build you career by opting Biotechnology, genetics ,bioinfomatics as a subject.

Thank you and don't lose hope .