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It may well be that those who use fertilizers that are high in phosphorus and potassium need to run such high EC to get an adequate nitrogen level and if using low EC get an nitrogen deficiency since many "nutrient lines" have unsuitable ratios.

What is your temperature and rhumdity? And what distance is the light away? Because if it is very close it could be too much with leds.

There is CHLORIDE (Cl‐), the anion of chlorine, in tap water and also as contaminant in almost every fertilizer or even in big quantities in fertilizers like potassium chloride that is widely used on fields. It is an essential nutrient in very small quantities. It is part of table salt (NaCl)...

Why do you think potassium based silicates should be avoided? I mean, the product with the highest plant available Si is AgSil 16H, which is a potassium silicate. Potassium silicates are widely used in horticulture and there are no studies showing any benefit in using more expensive silicate...

So true. They buy in bulk for even cheaper, just repack, put a fancy label on and charge those who don't know a fortune. Always the same in the cannabis ripoff industry. For example the Greenhouse Seed Co powder feeding fertilizers. Common premixed fertilizer salts as you can get it from almost...

Ok, your ph seems good, it will rise a bit the next days/weeks since the dolomite will continue to react. You could dilute the nutrient solution a bit to an EC of 1,0 if you want but i wouldn't worry too much as they are now at a size where their growth will soon take off and they will rapidly...

I would let it react for a few days but for this to occur a bit of moisture is necessary so it is best to slightly wet the mixture and mix it once again. But i think it should also work if it is directly used as long as it is thoroughly mixed since it doesn't take that long to neutralize if...

Yes it plays a big role if the lime is not powdered since it takes very very long for it to completely react. Longer than the few months till harvest. So it may well be that your substrate is too acidic since not enough was neutralized by the lime. I can't get powdered dolomitic lime too, so...

What is your target calcium concentration? I personally would not use much if any calcium chloride as fertilizers usually already contain a bit chloride as contaminants although i think it should be not much of a problem as long as you don't overdo it. Are you mixing your solution from...

It is common for the seed leaves to yellow and fall off, so i wouldn't worry that much and see how the plants are developing. Just be careful to not over water those young plants. Let the pots get a bit dry between the feedings the first times so the substrate doesn't stay wet all the time. Have...

Do you use tap water or reverse osmosis water?

Just saw at the end of the paper he writes that meanwhile they are using less potassium in the refill solution, so it should be somewhat lower than in their table at the beginning.

Oops i wrote a reply and just after posting i saw that you already did the math of mM to ppm :)

So, i read the paper once again. In this paper a special type of recirculating system is used. They do not dump the recirculating solution every week as it is common for such a system. They use the same solution for the entire crop cycle (several months) without discarding the solution and just...

I've read the paper you mentioned a few years ago but don't remember exactly what elemental concentrations etc. were described. I'll read it once again, perhaps i'm able to give you an answer on that. What i can say for now is that one difference is recirculating vs non-recirculating with...

Hello everyone! There are several things to consider. Dr. Bugbee's fertilizer recommendation is for use with tap water, and here's why: Firstly tap water contains calcium and magnesium (more often than not approx ~80 ppm Ca and ~25 ppm Mg), which together with some from the dolomitic lime is...