You can defenitely go for post graduate degree in agriculture.

You can do either Agricultural Science or Agricultural Engineering.The basic eligibility criteria for B.Sc Agriculture Science is 10+2 or equivalent with science subjects with a minimum 50% marks. B.Sc or B.Tech degree in relevant subject is needed for the 2 year Master's degree programs.For details about Agricultural Science click here
The basic eligibility criteria for BE/ B.Tech in Agricultural Engineering is 10+2 or equivalent with Physics, Chemistry, Mathematics and preferably Biology and have to appear for the entrance examination conducted at the State level, National level or University levelFor details about Agricultural Engineering click here.