[alexgmcm]

FTA:

> Without artificial fertilizers, hydroponic equipment from the Soviet Union was no longer usable. Instead, this was converted for the use of organic gardening. The original hydroponic units, long cement planting troughs and raised metal containers, were filled with composted sugar waste, thus turning hydroponicos ("hydroponics") into organopónicos.

So it seems the name might come from the composted sugar waste that was used as an organic substrate for the plants to grow on (as opposed to the prior water-based hydroponics systems).

Therefore it seems the name might not be related to "organic farming" etc. as we tend to see in the West.