It is true that milk and molasses will encourage the growth of some fungi
and bacteria. Whether they are benefical and this is a net benefit to the
soil and if it is any better than (say) adding organic matter such as
compost, manure etc is less certain. You would have to read up on any well
conducted studies to find out. There are many "magic bullet" garden
treatments that are said to do wonders, people swear by them and pass them
around, it doesn't mean they necessarily work or that they are better than
other systems. There are side effects, molasses will attract ants etc.
The classic case of this is Biodynamic farming, where a number of special
potions are prepared through complex and arcane rituals. The last I heard
the results were indistinguishable from standard organic growing methods.
This doesn't say that BD doesn't work, it does work. It is just a lot more
trouble than other simpler systems that work just as well. But people love
to have magic potions.
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