The easiest way to combine your interest in agriculture with teaching is to do a degree in an agriculture type programme, followed by a 1 year Graduate Diploma in Teaching (most universities have the grad dip in teaching). This is the easiest way as there are not a whole lot of courses that allow you to specialise in agriculture in a teaching course. But remember, agriculture studies is a branch of science so you will have to do at least some science courses if you want to study it at a university level.
There are a few ways you can do this. I found a variety of first degrees for you from Charles Sturt:
Bachelor of Agricultural Business Management
http://www.csu.edu.au/courses/undergraduate/agricultural_business_management/course-overview
With this background you will be able to teach Business Studies, Agriculture and maybe General Science.
Bachelor of Agricultural Science
http://www.csu.edu.au/courses/undergraduate/agricultural_science/admission-requirements
(requires background in Math and Chemistry but you can get in without as they have pathways to help)
With this background you will be able to teach Agricultrue, General Science, General Maths and probably Chemistry and Biology.
Bachelor of Agriculture
http://www.csu.edu.au/courses/undergraduate/agriculture/admission-requirements
(requires background in Math and Chemistry but you can get in without as they have pathways to help)
With this background you will be able to teach Agricultrue, General Science, General Maths and probably Chemistry and Biology.
Second qualification:
Graduate Diploma of Education (Secondary)
http://www.open.edu.au/public/courses/education/monash-university-graduate-diploma-of-education-secondary--mon-eds-gdi-2012
Qualifies you to be a teacher.