Calmag

use a nute ppm calculator on google search to figure out what you currently feed in regard to Ca / Mg - even N because i believe calmag has cal-nitrate in it?... 100-150ppm Ca daily feeding is probably a good range to start... this will in part depend on your tap water. Magnesium daily feeding is fine around 80-90, but you may need more than me due to my very hard tap water. this is tailored for a soilless or hydro grow, but still can be useful in soil too. In a tightly controlled environment and added co2, might need a bit more. just ballpark values that will allow oyu to observe and react to any small issue to dial it in. since you are in soil, this takes a little translation... you need to consider what was in the soil to start and whether you think you are at the point of providing 100% of the daily nutrient requirements (at least for ca or mg) once the original soil amendments are depleted. To jumpstart anything you'd need some familiarity with your soil... when does a calcium or magnesium issue show up? one of those takes 3-6 weeks before a symptom shows up, so you'd have to correct that one much earlier in the grow 'next' time (believe it is magnesium of the two that is a very delayed symptom on leaves). just as pH is important, ratios of nutes is important... they can block each other out or otherwise interfere with normal biological processes. it helps to have a more resolved idea of what you feed to hasten any learning curve.

Autos always do half feeding and play it by ear