Plant based is quite broad but look up tillage farming and horticulture and see what one suits your project best. You need to discuss how your project influences the sustainability in this enterprise, it is not just about naming it.
okay thank you, I don't have an imidiate teacher who can help me on this, but my project is on 2 plants and i use organic fertiliser for one and chemical for the other then compare but i don't think its enough to do on the topic on sustainability though. Would it be? I'd love to do it on a farm animal but but i don't have access to a farm.