Hi, BSc Agriculture is a UG course of 3 year duration which deals with the study of fundamental principles of agriculture.
B.Tech in Agriculture is a professional course of 4 years duration which deals with the study of engineering principles in agriculture.
The main job profiles being enjoyed by them include the following. (Bsc)
Agriculture Technician
Agriculturists
Seed Technologist
Agriculture Specialist
Some of the work profiles suitable for them include the following.(Btech)
Agricultural Sales Engineer
Farming Consultant
Agriculture Manager
Agronomist
Researcher

The reputation of the job profiles and also the remuneration of the B.Tech in Agriculture graduate are better than that of a B.Sc Agriculture graduate.
Good Luck.