I have 5 plants at two weeks planted in Coast of Maine Stonington Blend which claims to take a plant through to harvest without added nutrients. I don't think I'll take that as gospel so when and if doo you think I should start feeding them and should I add cal mag as well. They are in a 4x4 Grow Tent.
Ken
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I would add in CalMag every watering during Veg just in case as it's really hard to give them too much.
The main thing you have to keep an eye on now is the PH of your water. Try and keep it around 6.5 to 7. If the PH is off, then your plants will not be able to use the nutrients in the soil properly.
Probably give them at least 30 days of just PH balanced water with CalMag. After that try and measure the TDS (PPM or EC) or just keep an eye on them. If the leaf color starts to fade then they are hungry for nutrients.
Have fun!
Depends. Are you using synthetic or organic inputs? Are you using tap water? If so, look up your local municipal water quality test reports and see what they say regarding amounts of each elements to determine if it's necessary to add calcium or magnesium.
Full cycle nutrients(not saying it won't grow plants, but it won't grow as efficiently). To that I say-
BEGINNERS ANSWER
I don't think there is a way to make the proper ratios for all the way through to harvest. Plants require specific ratios at specific times for optimal growth and development. If you're going organic I'd suggest adding rose and flower from down to earth 2 weeks before 12/12. If you want just calmag go with dolomite lime (you'll also want slow release sulfur to counter the ph increase.
ADVANCED
You can mix ratios of biolive, seabird guano, and langbenite to make a custom fertilizer suiting your grow depending on cycle. It would probably last you 3-4 full grows of 5 plants depending on pot size. Biolive has billions of bacteria and mycorizea along with natural plant growth hormones from kelp extract and is a good general fertilizer. Seabird guano has phosphorus and calcium in high amounts. Langbenite has potassium and magnesium in high amounts. Mix them all together in appropriate ratios and you will have a very potent mix.
If you are feeding with synthetic fertilizers then it's basically dealers choice. Companies have different ratios but are generally similar and contain similar forms of these nutrients. Although, shout out to Chris, there was a recent from the stash where he was talking about combining different ratios of nitrogen fertilizers to stabilize ph. So there are subtle differences between brands.
Thanks for the advice.
Someone can give you a more detailed answer, but I think you need to measure your TDS of your run off as well as just observing your plants appearance. I think cal-mag should be used in each watering.