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A lot of the data that I use comes from cut flower plants. Seeing as cannabis is a normal cut flower plant, it mostly applies all the same. If you're in Denver, you've probably got 4 ppm Total K, 17ppm of Ca, 4ppm Mg, 16 ppm S. I have a water test from Denver water on my desk. :) And yes...

Well, short of getting the rest of the info on the label, here's where you stand on concentration. 1/4-1/2 teaspoon. 1 tsp is about 5ml, 1/4 is 1.25ml, so lets call it 1.7ml of the product. Loosely packed density is going to be about 1.25g/ml. 1.25g/ml*1.7ml = 2.12g. 2.12g/gal = 0.56g/l 1/8...

It seems as though JRPeters has stopped producing that blend. I can't find a label for it anywhere and it's no longer listed on their website.

Gotcha. Additionally, a 7-15-30 may have calcium or magnesium in it, so which one are you using? I know the 0-0-50 is a sulfate of potash.

Do you add any calmag of any sort to it? If so which one?

As I said, concentration is important. So, how much of each of those are you using?

Concentration is important here. Although, I do not ever recommend using that sort of ratio during flower. One thing to be aware of is that when growing in soil, developing a fertilizer program is a very very different ballgame. You can achieve the same results with two different soils and two...

The number one way to cause a calcium or magnesium deficiency is to have too high potassium levels, not phosphorus. Potassium competes with other positively charged ions, like calcium and magnesium.

That is correct. 500 ppm of your 2-1-2 will give you 10 ppm N, 5 ppm P2O5, and 10 ppm K2O. Something you probably just noticed was my use of P2O5 in place of phosphorus and K2O in place of potassium. This is important because that is what those numbers on the bottle actually stand for. To...

Alright, so, in reading a lot of your posts, you seem to misunderstand ratios with chemical concentration. Bear with me for a second, because this will all make sense in a bit. First off, all fertilizers in the US are sold on a weight/weight% basis. This means a fertilizer that has a 2-1-2 on...

Hardness is a measure of the quantity of divalent ions (for this discussion, salts with two positive charges) such as calcium, magnesium and/or iron in water. There are many different divalent salts; however, calcium and magnesium are the most common sources of water hardness. A low CaCO3...

Okay, so the rockwool cubes are wet. Did you wet them yourself before hand? And did you add any fertilizer to that water? Adding a small amount, at probably 1/4 concentration as your normal growth fertilizer blend is a good way to go.

It looks like all the Chempak fertilizers are water soluble. So, the media you use it in does not matter. Any soil that has had liming materials added will not necessarily have added magnesium, but will have calcium. All agricultural lime has calcium, but not all has magnesium. This shouldn't...

A 25-15-15 fertilizer will not likely have calcium or magnesium in it. So, make sure you check on that. A little bit of gypsum and epsom salt as a soil amendment would do you well in that case.

That's sort of what I thought, but I wasn't quite sure as I saw some green and a lot of purple.

lol, both your pictures are just about opposite in size. One is as big as my 4K resolution, the other smaller than your avatar. You're leaves are really purple. While your stuff may turn out okay in the end, purple leaves in the growth stages aren't healthy in the long term. You should only see...

You are right, it would be better off. But I gave him two options.

I'm sorry, I know I didn't answer your question. A PK additive like RSN8 will do you better for an improvement in flower. What I would do is look for any fertilizer that has a high number in the P and K slots, so like a 0-7-8 or like a 0-10-10 or even better, just monopotassium phosphate(MKP)...

Except Fullup isn't a Fulvic acid product. It's peat moss. And if there is iron in a product, it's added in addition to the fulvic acid.

Cha Ching is not just phosphorus and potassium. There's a nice big 9 in the spot reserved for total nitrogen. It also contains a bunch of your micronutrients. The thing about Cha Ching is that it is a very high phosphorus fertilizer. Which is about the opposite of what you want when growing cut...