soil already contains nutrients which a soil grower would just be topping up
a coco grower would be proving all of the nutrient through feed as there is none in the coco
how would you accurately measure how much you're giving the plants? there isn't two different charts
Soil typically contains enough nutrients to get through about four weeks. After that, nutrients must be added. In coco, peat or other inert growing medium, it's much more like hydro, and nutrients must be added from the beginning.
You measure your nutrients by using an Electrical Conductivity (EC) or Total Dissolved Solids (TDS) meter. EC tells you, well, the electrical conductivity of the water (which you can decipher the strength of the solution). A TDS meter measures PPM (Parts Per Million) of the dissolved solids in the solution. A TDS/PPM meter is a EC meter, but it displays the result in PPM instead of EC.
For example, in veg, all of my plants except for brand new seedlings get 750-850 PPM (1.5-1.7 EC), and in flower, a bit higher at 900 PPM (1.8 EC). The baby seedlings have the same veg nutrients, but diluted to half strength (~400 PPM).
Those measurements don't work for everybody, nor do they always work for all of the plants in the same tent. Some adjustment may be necessary here or there.
