Hi. Yes you are eligible for BSC Nursing. I recommend you to go for it and apply for the course . A lot of good colleges offer BSc nursing through lateral admission or through entrance exams. Since a diploma course is just equivalent to a plus 2, and since you are from agriculture background, pursuing a BSC would be the best for you. You can also go for BSC Agriculture and then MSC Agriculture to get expertise in your field. Or else, if you are interested in nursing, you can definitely go for it. You are eligible for BSC in any specialization.