Atami puts ec in theyir chart but like the nutrient dose cut it in half, i like give 300seedlings, 800/1200grow, 1200/1800 all the flowering in general for heavy eaters and non. 200ms watering with calmag for like 3 times to give the time to eat and then again, so in soil you can follow the ec that u can use in coco maybe, but u have to give the plants the time to eat all the salt accumulation .