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| Forums > Marijuana Growing > Growing in Coco Coir > An apparent potassium deficiency | ||
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#1 |
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Member
Join Date: Dec 2016
Posts: 90
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An apparent potassium deficiency
This is my fourth run in this facility and the fourth time I've had this issue. It starts happening right after stretch. Symptoms are a yellowing/browning of edges of leaves from lower half of the plant, working it's way up the plant. Effected leaves eventually completely wither into a crisp and fall off the plant. Plants are on an auto-feed system fed 4 times a day. Coco is always moist.
Nutes - AN Sensi Coco Bloom A/B - AN Big Bud Coco/Overdrive (depending on week#) - AN Bud Factor X - Have also used Canna Coco A/B with same issue Coco - Canna bricks expanded and flushed down to feeding levels Strength - Between 450 and 550 ppm Ph - Between 5.6 and 6.2 Runoff Ppm - Between 550 and 850 Runoff Ph - Hovers around 6 Temps - 68-74F Relative Humidity - Between 55 and 65% Co2 - Set to 700ppm Pics linked show the bad damage at lower section of plant, beginning stages of damage at middle section of plant, and an apparently healthy canopy that will be deficient before harvest. I get that deficiencies are normal with a flush, but this issue creeps it's way into the tops before I'm usually ready for the flush. I've had issues showing up in the canopy as early as week 5 in the past. Sorry for not color correcting the photos. Also sorry for not attaching the pics here at the site. Tried to 3 times, but each time the 'attachments' pop-up just whited out and lagged up. https://imgur.com/G4JrINr https://imgur.com/MGLd5SJ https://imgur.com/zYc2520 https://imgur.com/0snCg9N |
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#2 |
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Frequent Flyer
Join Date: Nov 2011
Location: ~ In The Garden Pulling Weeds ~
Posts: 3,223
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I can see some significant leaf twist going on there, which points to a pH issue. Leaves tacoing is a mag thing.
Quick fix spray with Epsom salts. For future keep the pH a little tighter window. 5.9-6.1 is good for coco. Nice looking room! |
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#3 | |
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Member
Join Date: Dec 2016
Posts: 90
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Thanks lester. I'll try to keep the pH more stable for the next week alongside flushing the coco out and see if that does anything. The leaves are falling rapidly now, which is worrisome. AN likes to tack magnesium onto all their million additives. I've only noticed differences in big bud, overdrive, and factor x, and I use them at less than AN recommends. I think for that reason I get mag issues from time to time. Spraying in flower has always scared the crap outta me. Will it effect flavor/smoke at all? |
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#4 | ||
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Senior Member
Join Date: Sep 2015
Location: Deep in the Timber
Posts: 1,572
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1 year ago I posted in your other thread, when you were having similar problems...I warned you of exactly the dilemma you face now.
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But once again, Merry Christmas to you and yours. |
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1 members found this post helpful. |
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#5 |
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Member
Join Date: Dec 2016
Posts: 90
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Oh hey bwana, I remember you lol. Looking back on your post, I can't seem to find anything too helpful to be honest. Here's a direct quote of what you advised me to do back when I was dumping 400+ ppm of calmag on my girls during my first grow;
"Dump the CaMg, check your PPM meter(8ml should be much higher than 350, you're pushing the mid-late range flower feed), get pots with better drainage(no larger than 2 gal.), rinse new pots with 5ml PG of A+B & 1/2 tspn of Epson PG. Mix correctly(A into water wait 15 minutes...B into water wait 15 minutes...then PH to 5.7-5.8 before adding Epson). The A+B will never need more than 2ml per gallon added, I never use any CaMg additive anymore...the base has plenty." I've since cut out calmag almost entirely, giving them only a light dose (100-200ppm) whenever they show obvious deficiency signs. Drainage is and always has been good. I get runoff on a daily basis. pH is always between 5.6 and 6.2. True that I don't wait 15 minutes between A and B nutes (I've since moved to AN from Canna btw), so maybe that's it. Oh you also advised me to stay away from silica, which I no longer use, and to use multiple feeds, which I've always done in my flower room. I think it'd be helpful if you gave me some up-to-date advice my man, if you still see the problem clearly. Maybe link me to a few of your own journals, videos, or pics so I can see the differences too. I'm always down to learn. |
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#6 | ||
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Senior Member
Join Date: Sep 2015
Location: Deep in the Timber
Posts: 1,572
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![]() You the same guy that won't listen any advice, members try to help you and you choose to ignore sound advice...then insult them with your "all knowing wisdom" When DHF, Dans Buds, and others add multiple posts of advice in detail...you choose to find a shortcut to success your way. I've offered help many times, and now you state "I can't seem to find anything too helpful to be honest" haha. I'd advise dumping more chemicals on them, and sing Olivia Newton John songs to them daily...hoping for some primo this round..."my man".Here is the list of your threads, from day one on ICMag: Some Coco Issues Terrified of Broad Mites 2.0+ EC runoff and auto watering Corrosive Acne Flower Week 2 - Burned or Deficient? It appears we have hermies One of my Blue Dream phenos smells... bad Let's talk about salt buildup. Coco - Unknown Issue An apparent potassium deficiency Huh, do you see a pattern here??? Wonder what could be happening he say's ? Maybe I should re-read all of the thoughtful & constructive advice that was offered to me ? Your arrogance and unwillingness to listen(learn)will be your undoing, you THINK you know the answer before you ask the question...so why ask ? Example: Quote:
PS: There is no "up to date" advice, nothing has changed in growing weeds except mechanical technology and more shiny objects(Nute labels)available to anyone with the internet. PPS: Please don't offer further advice on growing to new members, it appears you'd find Chia Pets challenging ![]() |
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3 members found this post helpful. |
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#7 | |||||
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Member
Join Date: Dec 2016
Posts: 90
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Hmm interesting. I seem to really have bothered you lol. Sorry if anything I've said offended you brother. Let me unpack that post real quick.
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Let's take a look at that list of my threads together yeah? Quote:
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#8 |
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Senior Member
Join Date: Sep 2015
Location: Deep in the Timber
Posts: 1,572
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The nature and tone of your response, say's all that I expected.
You have the same problems you had in the past: 1) You DIDN'T pay heed to the sound advice. 2) You have all the answers, and everything is "wonderful now" 3) Everything is a debate for your convenience and continued dialogue. Instead of "unpacking" your bullshit, you should have spent the time reading the advice...the answer is there, it always has been. Merry Christmas |
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#9 | |||||||||||||||
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Member
Join Date: Dec 2016
Posts: 90
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It's objective that this view of me you have is false. There's dated documentation in the form of my threads and responses. I took advice in every thread I've opened. I've made changes every time I've had an issue. Here's a rundown of all my threads. Some Coco Issues - Took the advice of cutting way back on calmag. Terrified of Broad Mites Corrosive Acne - Took advice of getting the plants bit further away from fan. 2.0+ EC runoff and auto watering Flower Week 2 - Burned or Deficient? - Took advice of flushing out the buildup. It appears we have hermies - Took advice that early budsites just look like that. One of my Blue Dream phenos smells... bad - Took advice of having patience to see how she develops. Let's talk about salt buildup. - Took advice on watering to runoff. Epicseeds mentioned a nute calculator that I've been wanting to learn for a while now, but have been too lazy if I'm being honest. Coco - Unknown Issue - Took advice of lowering EC. Quote:
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- I start a thread titled "I think we have hermies" with pics. - I don't actually have hermies. - Guy #1 says "chop the garden down." - I immediately walk away from computer and chop garden. - Guys #2, 3, and 4 say "don't chop, those are normal." - I come back and read other guys' posts. - Fml. Quote:
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So which piece of all of this advice deals with the issue I'm seeing currently? Is it not having 6.2-6.3 pH for my flowering girls? pH too low (5.6-6.0) causing lockout of P or K? Or is it not using epsoms, and therefore ending up with a mag deficiency? That's all it could possibly be according to you, since I've taken all of your other advice besides using maxibloom, and I'm positive a good grower can make a grow work with any number of nute lines. It'd be helpful to me if you could respond more precisely next time, rather than writing out a haiku or throwing an illegible tantrum. Something a bit more direct perhaps, like "I don't want to help you", "I don't have the answers", or "Here's what you could try", like how adults problem solve. Sorry of this post is harsher than the others. We all have the same profession/hobby here at this site. It's a loving and scientific field. I come here looking for helpful, scientific, and friendly discussion. When I get a grown ass man coming in here with a year-old grudge that's based on a misunderstanding rudely encrypting his communications to me from a place of emotional pain stemming from the aforementioned misunderstanding (which has somehow gone unhealed over the course of a year) I get impatient. Sort yourself out brother. I've never meant you harm. |
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#10 |
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Senior Member
Join Date: Sep 2015
Location: Deep in the Timber
Posts: 1,572
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