Yes, I believe you can pursue Postgraduation in Agriculture after B.Sc. in Community Science. Most of the Universities have relaxed their eligibility criteria nowadays. However, it would be preferable to check and re confirm the same with your Target Universities and Colleges.

For more information about Agricultural Science Courses do follow the link below

https://www.careers360.com/courses/agricultural-science-course

For more information regarding M.Sc. Agriculture/Agricultural Science at Universities do follow the link below

https://university.careers360.com/colleges/list-of-msc-in-agricultural-science-universities-in-india