Calcium deficiency or too much light? Getting frustrated

theR6maniac

theR6maniac

Active Member
I've had these weird brown..almost slightly red spots ever since I started my grow... I have looked at a bunch of pictures to compare and the only thing that looks similar is a calcium or manganese deficiency. I did a flush and got everything where it's supposed to be again and used some Cal mag about 4 days ago and I still see new spots on fresh growth.

I have two mars 300w led full spectrum, 2 large 2700k CFLs in the center and a couple small fluorescent tubes for side lighting. I'm experimenting with turning the LEDs off completely. This is day two and I still see new spots that weren't there yesterday...Im still thinking it's the LEDs since the leaves with spots are all large and very exposed to light. The leaves underneath are much less exposed and look perfect.

Really need advice I'm starting to think I messed this all up and wasted alot of time/money
 

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Joint Monster

Joint Monster

Well-Known Member
It looks like a CalMag deficiency, fairly progressed.

You want to begin feeding CalMag at the dosage you should be, or increase it slightly from what you are currently giving. You do not want to try to over-dose to "make-up" for the deficiency.

Old growth will not get better. You are only looking for the problem to not progress.

Do you have any means of checking PH?
 
tiltswitch

tiltswitch

Well-Known Member
As above, really we need to know what nutes and what medium, if your in soilless I doubt your problem is cal mag , rather you have a cal mag problem due to unbalanced ph I suspect, unless your plant has been in the same pot for months. Give us more info, definitely it can be sorted
 
theR6maniac

theR6maniac

Active Member
tiltswitch said:
As above, really we need to know what nutes and what medium, if your in soilless I doubt your problem is cal mag , rather you have a cal mag problem due to unbalanced ph I suspect, unless your plant has been in the same pot for months. Give us more info, definitely it can be sorted
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All the info is on another post I have. I'm new to this site but I've kept the pH at 5.9-6.2 and nutes are fox farm trio...temp is between 68-75 humidity under 50. It's a dwc setup with clay pebbles as a medium
 
theR6maniac

theR6maniac

Active Member
theR6maniac said:
All the info is on another post I have. I'm new to this site but I've kept the pH at 5.9-6.2 and nutes are fox farm trio...temp is between 68-75 humidity under 50. It's a dwc setup with clay pebbles as a medium
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Oh and I started these on April 17th and was a little late adding nutes
 
tiltswitch

tiltswitch

Well-Known Member
theR6maniac said:
It's right around 900 but it bumped up slightly with the calmag. It was a cheap bottle and they gave no instructions so I only added 2 tablespoon for 15 gal
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Proberly not enough cal mag, needs to go in every res change. Find out what the dose is online for your cal mag, you can't guess really
 
Xs121

Xs121

Well-Known Member
Is that 900 your normal nute mix? I'm guessing when you top your reservoir , the ppm of the mix you add is below 900, right? If my guess is right then you have a rising ppm. For a plant that size, you're pretty close to 2 EC which is really pushing it for that size.

Now, if you have a rising ppm then it means you have salt build up in your reservoir. Your plant is not taking all the nutrients you're feeding it. Whatever nutrient that is left behind is building up and from the look of your pic, you have excessive combination of phosphorus and potassium (toxicity).

Rising ppm is also due to high canopy temperature. You mentioned about 2 led lights, 2 cfl, a couple of florescence, I know you mentioned your ambient temperature but what's your canopy temperature? When your canopy is hot, plant will use a lot of water but will be inefficient in absorbing nutrients.

Just my 2 cents.
 
theR6maniac

theR6maniac

Active Member
Xs121 said:
Is that 900 your normal nute mix? I'm guessing when you top your reservoir , the ppm of the mix you add is below 900, right? If my guess is right then you have a rising ppm. For a plant that size, you're pretty close to 2 EC which is really pushing it for that size.

Now, if you have a rising ppm then it means you have salt build up in your reservoir. Your plant is not taking all the nutrients you're feeding it. Whatever nutrient that is left behind is building up and from the look of your pic, you have excessive combination of phosphorus and potassium (toxicity).

Rising ppm is also due to high canopy temperature. You mentioned about 2 led lights, 2 cfl, a couple of florescence, I know you mentioned your ambient temperature but what's your canopy temperature? When your canopy is hot, plant will use a lot of water but will be inefficient in absorbing nutrients.

Just my 2 cents.
Click to expand...
Sorry I never saw this until now. My canopy twmp rides around 73-78 and I think you are correct about the excess phos/potassium. I recently did another flush and got everything balanced out. All strains are growing well now. I moved 3 plants outdoors in 18 gallon drums and they seem to love the sunshine :) I just did a little LST on them last night. I've also selected a mother to start doing clones. This one is growing literally 3x faster then all the others and is huge already. I put her in a locker so there's plenty of stretch room.
I'm kind of forced to learn this stuff the hard way or at least the slow way. Can't talk about it with anybody and research only gets you so far. Definitely starting to get a "feel" for what my ladies need. Just about to start flowering in the cabinet after the little runt gets big enough to hookup the screen. Wish me luck!
 

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