Hi,

Both these fields are totally different. It depends majorly on what you have interest in. After B.Sc Agriculture , you will be able to apply for various posts like officer, assistant in  government agricultural sectors. You'll have to deal with administrative work and also understand the field work well. You can also go in the management industry after agriculture degree. You'll have lots of opportunities in both private and government sector. In case of physiotherapy, you'll be able to go for your masters, and apply for jobs in the private sector, mostly the hospitals, clinics, rehabilitation centers, etc.  So it's upto you which field you want to choose. 

Hope this helps, good luck to you!