Hey growmies. I think i might have a slight nitrogen deficiency going on but i wanted to ask the community what they thought? And also suggestions as what to do. I’m growing in coco perlite using ro water. Vivosun base a and b nutes vivosun nutriboost rqs rhizoblend and gh calimagic. I don’t have anything that’s straight nitrogen but it was almost time to add the nutriboost and rhizoblend again. I did that, the rhizoblend has a good amount of nitrogen.
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Looks more like Mag.
Marty
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That’s actually what my first thought was especially since I’m using ro and i switched from spring water to ro about a week ago. I’m putting in cal mag with every watering so maybe just bump up ? I root drenched 1ml of cal mag in the ladies that were showing signs.
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I use 1 tsp per gallon cal mag with good led lights
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Okay i been using half teaspoon per gallon i have really high ppfd and good c02 going so i suppose the high light and c02 need more nutes. Thanks for the input.
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I’m currently running 1200 ppm of Crop Salts and am about to bump it up to around 1400/2.5 EC. Every girl is different. Been adding Epson salts too.
Marty
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Thank you yes totally i know my dosidos are perfectly happy with what I’m doing… while writing this I’m realizing all 3 that are having issues are wedding Cake… just shows how important genetics are imo
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Thank you all for help… i just want to say i think it’s really cool when you can see almost instant results from fixing a decicency like what must have been a mag def or iron either way they are looking very healthy now just one day after adding nutriboost and calmag… instantly gone
This last one was the worst and may need a bit extra guess if your growing wedding Cake add extra cal mag everyone. While it was not exclusively on the wedding cake it showed up first and most in the wedding Cake barely even showed on the dosidos. While the whole nyc sd plant turned slighlty yellowish almost gaundance… they are all looking very healthy now
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So just wanted to give another update they are looking healthy and completely healed ( except1). It was a mix of a magnesium and iron deficiency most definitely, possibly slight calcium also in some of the plants… after i gave them a root drench of cal mag and foliar spray it looked like it improved over 1 to 2 nights. I then added chelated iron in its next feed with a foliar spray of iron amd magnesium and the next morning (today) they look beautiful and it’s hard to tell which leaves were even affected on some of the plants. I do have 1 NYC SD that needs more cal mag still slight yellowish bottom leaves. (Could it just have grown with a cal def and that’s how it Is now??) I’m going to root drench and give it another folar spray on the next watering in a few days see how she does. It
The last pic is the NYC SD… any useful insight is always welcome thank you
Justin
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Cut that leaf off and take another picture. 
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Is this nitrogen or magnesium deficiency? Or a light issue … i checked ph 6.2 growing in coco i was spraying magnesium but i stopped and i did notice the yellowing leaves were on the side facing the side lighting so I’m not sure if i missed spraying ( over a week ago no longer spraying mag) the last time or a light issue from not being turned and too close or nitrogen because i over did the nitrogen slightly before and put a lot less In the last feed all the other plants are happy now a few still got some really dark leaves besides that they look good. I just flushed it with foxfarm sledgehammer. I flushed all my plants I’m starting fox farm nutes and haven’t flushed them at all yet so thought it would be good to do before starting them on new nutes i ran out of my last base nutrients and were not happy with them really.( vivosun base nutes)
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Nutes are nutes. With the plant in growth stage, it needs nitrogen plus its other pk…you would dial the new nutes back to a weak formula and rack it back up to normal strength within a few feedings.
What do you mean spray magnesium?
From looking at them overall, I think you may have gotten a nitrogen overdose. I’m looking at the leaves on the far left of the picture and some of them behind the leaf you are inquiring about and it looks like nitrogen toxicity. If you overdose you can kill a plant, it won’t get greener past a point but instead die and turn yellow.
Marty
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Magnesium is a foliar absorbable nutrient.
Spray it on for quicker recovery of a deficiency.
Marty
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Yeah i figured as much in some of the other plants… so i probably over did the nitrogen and caused a nutrient lockout? I did notice the plants with darker leaves have purple stems of the fan leaves after flushing them the other day a lot of the leaves started to go back to a more natural green… i also stopped using the vivosun nutes as i think that was partly the problem switched to foxfarm. I think I’m going to flush them again before starting them on the foxfarm though.
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I was spraying magnesium with some good noticeable signs but your not really supposed to spray in flower i heard is that correct? Or is it fine for mag and just not to do it in like the last 2 or 3 week’s? I hear some conflicting information about spraying nutes
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So i flushed them again and when i flushed this second time i initially got a crazy low ph reading im assuming this is from the nutrients building up in the coco and then being washed out? I kept flushing until the ph got back to near 6… I’m flushing with ro water ph to 6.3 with foxfarm sledgehammer… i got all of them to ph between 5.8 and 6.4 by the last of the run off
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Almost all brands of nutes will lower the PH of your feed water and so also your runoff water as well. That is why you PH them before you feed. I have long said that the nute companies tell you to overdose to sell more product. It also depends on the strain, some will suck up tons of nutes and go gangbusters and others will do what yours are. I have had both, I am currently running a strain called Blackberry Moonshine that is sucking up everything I am throwing at them, I am two tiers UP from the standard dose and they are just generally pale, not like yours with dark dark green then burning I mean just overall still hungry and this is with the auto watering system Autopot.
Unless you make it too strong mostly foliar feeding won’t harm them, sometimes it will brown the pistols, so just keep the spray on the leaves only. I suspect you don’t need any addition of any kind at the moment.
Marty
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So i read that too much phosphorus will cause the ph to drop in the root zone as well. I’m going to start low and slow. I was feeding using vivosun vbase nutes and not realizing just following instructions i should have changed the formula for flowering and i forgot the cal mag i was using also had nitrogen in it so that’s where i got too much nitrogen from in thinking. I just ordered an organic cal mag with no nitrogen. It was just strange it came out at ph of 2 to 3 for a min in almost all the plants. When i flushed last time it came out closer to what i was putting in actually a bit more alkaline this time it came out 5 then dropped to 2 then got it to go back to to almost 6. So I’m hoping that was all the built up salts and nutes coming out. I’m starting with half the general feeding… my dosidos were like that at first i had to keep upping the feeding in just that one strain they have a good dli and i have c02 ambient of 600 and running 800 to 1000 for about 4 to 8 hours a day.
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