Nitrogen toxicity maybe??

Hello. This is my first grow and I chose to try organics. For my first run at trying to grow cannabis. I followed the subcools super soil recipe but I cut it down to 1/4 of the recipe. I have let it cook for 30 days or so. I just planted my month old plants in 7gal pots with only 1/3 of the pot filled with super soil 11 days ago. Every thing was looking great until I noticed a cal mag deficiency due to using RO water. I started using earth juice oilycanna and color started coming back to the bottom leaves. Now I have noticed that after this last time watering (with some azos) and the 90+ weather we just got hit with. My plants have started to claw a little and have really skinny growth of new leaves on the very top of my plants. They act pretty healthy always really perky in the morning and relax in the evenings. Not really sure what I may have done wrong. Hoping I don't have to repot or worse chop down. Anyone over come this problem before??

They look fine to me. I don’t see anything wrong.

I have a few burnt tips and clawing that I was worried about. I wasn't sure fixing my cal mag problem brought on nitrogen toxicity.

We’re those last 2 pics taken during lights out?

Yea sun just went down.

Saltysalamander said:

Yea sun just went down.

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Oh ok. I honestly don’t see anything to be too worried about at this point. It’s good that you’re being vigilant and paying attention. Good habit to get into. But sometimes being overly cautious can make you do things that just make matters worse.

I agree, its a double edged sword lol. looking at them this morning they are looking good. Roots must gave just hit the SS, toasted a few tips but that should be expected i presume. I used plain tap after aerating it for 24hrs and clawing is almost gone and burning has stopped. Thank you for helping ease a worrying gardeners mind. Just gonna work on this cal mag deficiency though. Any experience using hay or straw as a soil cover to protect from heat and drying out to fast??

Saltysalamander said:

Any experience using hay or straw as a soil cover to protect from heat and drying out to fast??

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Don't use hay. It'll break down and eventually rot. Use straw for this job. Just add a loose layer on top of the medium. The medium still needs to exchange air so don't pack it down.

spek9 said:

Don't use hay. It'll break down and eventually rot. Use straw for this job. Just add a loose layer on top of the medium. The medium still needs to exchange air so don't pack it down.

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Thanks, ill find some straw I appreciate the advice.

Love how every single grower thinks you treat individual calcium or magnesium with cal/mag but actually risk doing more damage. I never use cal/mag anymore just magnesium during flower to keep chlorophyll healthy.

Sade said:

Love how every single grower thinks you treat individual calcium or magnesium with cal/mag but actually risk doing more damage. I never use cal/mag anymore just magnesium during flower to keep chlorophyll healthy.

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Definitely not every grower, just growers who have been misinformed. For most, they repeatedly hear "Cal-Mag" and assume they are virtually a single element.

Ca and Mg are often bottled together, because nutrient companies most often have much reduced or even absent Ca and Mg as they assume that the vast majority of their users use water with enough of those nutrients already present. Adding those in would cause toxicity in a lot of cases. For us users who have very low PPM water (ie. not enough PPM to contain enough Ca and Mg), Cal-Mag is a single solution to correct both nutrient amounts.

Also, Ca doesn't play nice with other specific chelated nutrients (Phosphates, Sulphates etc) especially at concentrated levels. The Ca causes precipitation of the nutrient solution whereby they fall out of suspension and are no longer available to the plants for uptake. This is another reason why Ca isn't always included in a base nutrient regimen.

spek9 said:

Definitely not every grower, just growers who have been misinformed. For most, they repeatedly hear "Cal-Mag" and assume they are virtually a single element.

Ca and Mg are often bottled together, because nutrient companies most often have much reduced or even absent Ca and Mg as they assume that the vast majority of their users use water with enough of those nutrients already present. Adding those in would cause toxicity in a lot of cases.

Also, Ca doesn't play nice with other specific chelated nutrients (Phosphates, Sulphates etc) especially at concentrated levels. The Ca causes precipitation of the nutrient solution whereby they fall out of suspension and are no longer available to the plants for uptake. This is another reason why Ca isn't always included in a base nutrient regimen.

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Yes sir I keep my iron chelate separate from potassium phosphate. Usually people dont have a calcium problem but mainly magnesium problem in flower with early face. I use Magnum from Humboldt county's own nutrients.

Sade said:

Yes sir I keep my iron chelate separate from potassium phosphate. Usually people dont have a calcium problem but mainly magnesium problem in flower with early face. I use Magnum from Humboldt county's own nutrients.

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As an alternative to a name brand bottle of something, Epsom salt is an extremely cheap, extremely water soluble product to bump Mg, and you can buy it pretty much anywhere, such as a grocery store.

spek9 said:

As an alternative to a name brand bottle of something, Epsom salt is an extremely cheap, extremely water soluble product to bump Mg, and you can buy it pretty much anywhere, such as a grocery store.

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Yea but I get free stuff because I know the owner personally and drops off free clothing merchandise at my local hydroponics store.

Sade said:

Yea but I get free stuff because I know the owner personally and drops off free clothing merchandise at my local hydroponics store.

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Fair enough. Still good info for future readers though, those that don't have the contact you do and would like to pay pennies on the dollar for essentially the same stuff, but that doesn't come in a fancy bottle

spek9 said:

Fair enough. Still good info for future readers though, those that don't have the contact you do and would like to pay pennies on the dollar for essentially the same stuff, but that doesn't come in a fancy bottle

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Yea I tried switching to all natural ph adjusters but here you have to use quite a bit to equal the polyrythmic scale of ph.

Calmag use to be a must for me because I only used distilled water, didn’t trust my city water. After seeing my city water test results, all was well and I’m tap water forever now. Don’t ever really use calmag now. If I was growing in coco I probably would.