Roller the most important factor in determining what soil amendments we use has to be the results we get from comprehensive soil tests at the outset.
I'm not advocating the use of sugar in all and every situation to improve soil biota, there has to be thorough examination and diagnosis of what if anything is lacking in the particular soil profile being looked at, and this is of course in conjunction with an understanding of the interplay between plant (tree) and the soil food web.
It can get very confusing discussing this across continents since we all work with different soil classification systems, very different climates, different plants and very different soils.
Sugar in the form of pure molasses, when applied as a diluted soil drench does have a well understood impact on the organisms living in the upper horizons, but you must first know what organisms are there and how they are interacting before you can even consider influencing any aspect of the rhizosphere.
Basic soil structure and chemistry is still a huge factor in the health of not only the plants living there but also all the other living organisms.
__________________ Sean  Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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