how much Ca is to much / to little ?

[habeeb]

looking at lucas / pH , I think, what is to little Ca, and to high Ca?

I'm looking for info relating to this, as mel franke's chart shows no mention of Ca, so what basis do we have to go off of?

we have a formula of : K:Ca:Mg = 4:2:1 , but where does this come from, and we all know, plants vary from plant to plant, so if this chart is for some other plant, it might not fully fit our plant?


as said, what do you think is to much Ca, where is causes problems, and to little where you start seeing a deficiency?

from what we do know, Ca move slowly in Ca, how can we use this to our advantage in knowing how much Ca to apply?

I have not much to say, as a soil grower, lime takes care of everything, which is why moving to hydro allows me to fully experience more range and detailed understanding of nutrient analysis..


comments / info welcome !

 

[BlueberryLovr]

If you are using RO water with appropriate GH line, Ca shouldn't be a problem unless the strain wants to eat more of it. For example: during flower. Lucas is hydro EZ-mode. Maxibloom or FloraNova even easier!

 

[YosemiteSam]

Check out Carl Cox's thread about tissue analysis. That will give you a good start on where those numbers come from.

I don't really like to compare Ca amounts to K. Most people use too little K...so that would lead to too little Ca also.

In general, flowering plants prefer NPK of somewhere around 3-1-4...very little tweaking should be needed from there. If that is where you are then...my opinion...Ca should be somewhere between 2.5 and 3. What do I base this on...well, I was running around 3-1-4-2.2 and then did a foliar feed with Calcium 25. 48 hours later the brix of my plants (measured with a refractometer) had increased significantly. No other changes. Now, to me, that says my plants would have been a little happier with higher Ca from the get go.

 

[ShroomDr]

Most Fertilizers are somewhere around 1:1 to 1:0.8 N:Ca

K, Ca, Mg (and Na) all compete with each other, so too much of one will start locking out the others (check out the periodic table).

I think your on the right track with the K:Ca:Mg 4:2:1, ive also seen 8:4:1, (but this may be too low Mg).


Here are some images of a study AN commissioned (from a 20 page pdf)