As we're on the subject. Has anyone got any good pointers to any actually scientifically sound research/advice on gardening/growing crops on a smaller scale. T

As we're on the subject. Has anyone got any good pointers to any actually scientifically sound research/advice on gardening/growing crops on a smaller scale. The amount of rubbish I've heard spouted by gardeners about what you should and shouldn't do is crazy. And I'm not even talking about the more 'spiritual' side. Even seemingly mainstream type stuff like companion planting isn't internally consistent.