The admissions in agriculture is through entrance exams counducted by the various authorities. And the candidate must have passed the exam with 50% marks. There are various entrance exam like EAMCET, KEAM, PAU exams, IGKV CET based on the various universities. So you have to clear the entrance as per the respective university norms and then you will be able to get the admission in th agriculture courses. Also refer the link below to know more about the agriculture admissions and the colleges offer this course.

https://collegedunia.com/courses/bachelor-of-science-bsc-agriculture