what do u think pop is? sugar water phosphorus CO2, all that stuff is good, but i dont see why ppl would add sugar (molasses) to their soil.
Somebody (or more) obviously doesn't understand the concept of organics (or plant bio in general). Even if you weren't growing organically, all of that stuff is not 'good'. A primary issue is the carbon dioxide. Plant roots do not utilize carbon dioxide (foliage does), they actually breath oxygen and most of the soil biota does as well. Carbon dioxide is heavier than air; it tends to settle, not rise... meaning if you poured any carbonated beverage on a plant not only is the gas not going to help the plant, it could cause problems for the roots and the microbes.
Phosphoric acid could also burn the roots, and I am pretty sure that plants actually absorb
salts of phosphoric acid (phosphates). Granted that these salts will probably form as the phosphoric acids dissociates H+ ions in the substrate...but WHY?
Sugar and molasses are far from the same thing. Molasses is a by-product of the sugar-refining industry, left over from
after the majority of sugar has been precipitated out. Of course there is still sugar that remains, but more importantly minerals have been concentrated. So molasses introduces some carbohydrates primarily intended to stimulate microbial activity
as well as minerals.
Soda is too likely to shock or even kill the microbes before they could ever utilize the sugar, and even if it didn't it is quite useless nonetheless.