Can I ask what week do you start raising K and, Ca and, also do you raise P as well? My last few runs I did not adjust P. I let it sit at 40 ppm the entire time, but I think it would of been better to raise it slightly.
Were you having an issue with micros and low P? Otherwise, Iāve had no issues with 40 ppm P in flower.
I use CaAOc at transition like @SidViscous. but not through flower.
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Yes. Iāve bumped it up to 66 and things, while not perfect, definitely look better. A friend on another forum has recommended bumping it up to 80 something. Iām a little hesitant to go that high at the moment.
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The plants will tell you.
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Can I ask when you cut out the Ca acetate and, what else you use to maintain Ca levels in flower?
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With Jackās, I just use cal nit start to finish, calcium bump at transition with cal acetate. @SidViscous also uses it all through flower. Itās the same stuff in Mendocino Flowering Cal Mag (no N).
When I mix my own, I can raise calcium over nitrate levels.
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It seems P antagonizes micros? Not sure where the sweet spot would be for P? @emdub27 suggested 65 to help with the micros uptake.
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You canāt ask everyone what to run in ppm for each individual ion. I could be running the same or wildly different ratios of other ions compared to others. Ratios are more important than absolute values for single ions. Environment and style are also incredibly important to dial stuff in. Top feed coco has a cec (effects cations and their ratios)and isnāt near as efficient as an undercurrent, so the concentration needs to be higher.
Edit: As an example, I have a spot right now that is N deficient (verified via tissue analysis) despite it being at 160ppm in late flower.
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I really wish there were an inorganic option for Ca other than CalNit and Ca-EDTA (not a real option fyi) but the CaAOc does the trick. Fwiw, out Ca probably doesnāt need to be as high as it is because the plants arenāt transpiring as much in flower but we didnāt want to mess with the cation ratios so we did the ālazyā thing and kept it high
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Would calcium chloride be an option?
I always wonder about it when I look at my bag of sidewalk salt for ice baths, but assume it isnāt a clean enough source to feed plants with. Seem to remember some talk of calcium chloride used successfully as a calcium source, just not from de icer.
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Yes, but itās like playing with fire. The Cl is incredibly bioavailable and will pretty heavily antagonize P and N. I personally will run Cl up to about 40-50ppm in solution without concern, but at those levels the macros need to be adjusted to compensate.
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We use CaCl2 to supply Cl, but I think our max is like 7.5ppm Cl so you really canāt get enough Ca from it to be worth much.
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Is there a best time to take brix readings? We typically do it an hour after feeding. Does it matter as long as it is consistent?
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I like to see beginning of day along with one around 7 hours after lights on. That way you can verify it is falling at night. Brix is more of an art than exact science due to its variability.
I use it mostly because no DRIS data has been published for cannabis and its entirely possible to be way off even if everything comes back in sufficiency range on tissue analysis. Iām currently compiling DRIS data based on brix, yield, terpene content and subjective quality. Cannabinoids used to be included in there, but the lab to lab variability made the data useless.
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Hello everyone. Just received my order of Calcium Acetate from bulk supplements. I plan on using it to boost Ca, while reducing the N from Calcium Nitrate. Not sure how much is to much. 1 gram per gallon only nets 26 ppm of Ca. Donāt want to end up using to much like I did with the Ca EDTA and mess things up. Anyone have any experience with Ca acetate that could provide some guidance. Any and all help is much appreciated.
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A gram per gallon is 264 ppm.
Bump it until your calcium is slightly higher than your nitrates. You may have to raise K as well.
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Is that the total ppm value because it says on the bag it contains 10% Ca? When I plug that into hydro buddy it says 1 gram is 26 ppm of Ca.
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Oh, duh. I forgot it isnāt all calcium. Hydrobuddy does a lot of my thinking. Youāre right.
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Iām super confused now because I found some papers on line that say Ca acetate is 25% elemental Ca. I wonder if that means 10% is C acetate and, the rest is Ca carbonate?
Calcium acetate is 25.34% elemental Ca.
Molar mass of Ca(C2H3O2)2 = 158.16604 g/mol
Atomic mass of Ca = 40.078 g/mol
40.078 / 158.16604= 0.25339
Adding 1g to a L of water gives 253.4ppm of elemental Ca.
Adding 1g to a gallon of water (3.785L) gives 66.9ppm of elemental Ca.
Is this what you bought? Calcium Acetate ā BulkSupplements.com
The 10% refers to percentage of serving size compared to suggested daily intake for a human. Not important.
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