Potential calcium lockout or deficiency?

Day 54. Noticing a worsening of what looks to be a calcium deficiency/lockout I noticed a few days ago. Unfortunately, my plant was neglected on Friday so I wasn't able to react until Saturday morning. The medium really dried out between Thursday night and Saturday morning. Nothing terrible, but I need to water every day. I noticed the calcium issue on 3BOG and the freebie. I think this is due to the excess potassium from sweet candy locking out calcium in the coco. So I've reduced sweet candy to 1g/gal and will potentially reduce it further. I gave all three a good amount of water, almost 2 gal between the three. Things looked fine this morning, nothing got worse. It looks more confined to the top of the canopy and it's not everywhere.

What does this look like to you guys? Medium is coco, 3 gal fabric pots. Nutes are 10ml/gal Canna A, 10ml/gal Canna B, 5ml/gal calmag, 2g/gal sweet candy (I've now reduced that down to 1g/gal, used this concentration for the water/feed last night. These are all mephisto autoflowers, 54 days from sprout. Left to right, freebie, forum stomper, 3bog.

Phosphorus deficiency

Phosphorous deficiency? I find that so difficult to believe as I was using sweet candy at 2g/gal. As I said, first thing I'm doing is lowering that amount to get more back to my base nutrients. What might be telling is I'm only seeing this leaf stuff in the area that has the brightest light. So I'm not sure if that's coincidence or evidence.

durbanpoisoner said:

Phosphorous deficiency? I find that so difficult to believe as I was using sweet candy at 2g/gal. As I said, first thing I'm doing is lowering that amount to get more back to my base nutrients. What might be telling is I'm only seeing this leaf stuff in the area that has the brightest light. So I'm not sure if that's coincidence or evidence.

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Well get back with us when you have it all figured out. I’m just going by what I see. Not by what you’ve given it. Good luck.

I'd cut the Sweet Candy out completely. Why were you using 2 grams per gallon to begin with? That's twice what they recommend. That stuff is just monopotassium phosphate, potassium sulfate, and magnesium sulfate. Everything in it that's required by the plant is already present in the Canna A/B in adequate amounts. The rest is just sugar and vitamins. Nothing you need to be giving plants growing in coco and especially with every watering.

I'm going to do that. Unless I misread, it said 1-2g/gal during flower. First time using it, so perhaps too much fertilization. Thank you both for your input.

durbanpoisoner said:

I'm going to do that. Unless I misread, it said 1-2g/gal during flower. First time using it, so perhaps too much fertilization. Thank you both for your input.

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I guess it does. I was looking at their online calculator and it showed 1 g per gallon but I see it says 1-2 on the label. It's best to alway go on the low end of any fertilizer recommendation. Also, when using additives with any complete nutrient as Canna A/B is it's probably better to halve the low end. I'm not a believer in using high P/K additives myself.

Check this out. Check potassium which you have been giving in excess. If you have a deficiency it doesn’t matter if you have been giving it if something else is locking it out. That is how that works.

Good to see that chart, thanks.

I'm going to cut out the sweet candy completely and will water with that solution tonight.

Thanks for the advice fellas. I cut out sweet candy and all looks good. Staying with 10ml/gal A and 10ml/gal B.