Yellow leaves , brown spots like burns - HELP

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friskiii

Member
My Mate is having problems with his plant some of the leave have brown spots on them with some yellow patches. his ph is at 6.2 and his ec level is at 10-12 he has just flushed them with a day of pure water and now he is using nutes again he is using a hydroponic nft system he is just a lil worried any suggestions? i will post a few pics. He is only using Vitalink A and B and some canna rhizotonic for root development.
Thanx.
 

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Brokerj

Active Member
Yes friskiii... This plant is not getting the right conditions...is it in a tent? Does it have a nice rotation of air? Are you using soil? Coco? You are over feeding it with nutes. Explain please...
 
Twiggiams

Twiggiams

Active Member
I have the same exact problem with only one of my plants. I just now started feeding them flowering nutes 10 - 60 -10 its the only thing i could find around my house. I was trying to do it O'natural with my compost dirt inside. I only have 3 plants in a cabinet and only one of them is showing these symptoms. If anyone has a good idea besides phosphorous deficiency I would be curious to know.
 
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Brokerj

Active Member
Your plants are flowering twiggams so unlikely to be the same problem I'd stop the nutes with that high npk though for many reasons... pk 13/4 from canna sounds similar to yours WMD you only use that for 1week throughout the flowering stage
 
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friskiii

Member
He is using a room with an intake and outtake he only uses both the fans for a hour a day as there only young and he also has a rotating fan for the humidity that runs constant and 2 hydroponic nft systems that is constantly running so they get food and water when they want it.
 
maps84

maps84

Well-Known Member
First picture is P. the other ones are Calcium maybe due to high PH. Given the severity state I'd say it's PH fluctuation damage. What's the medium? does PH rise or low? what're the res temps?
 
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friskiii

Member
medium is rockwool 6'' cubes ph is between 5.8 and 6.2 and temp is about same as the room not to sure yet till i see my mate. It cant be ph level as its right and he lowered the nutrient level so all ask him if there is any changes in the next few days.
 
Twiggiams

Twiggiams

Active Member
Brokerj said:
Your plants are flowering twiggams so unlikely to be the same problem I'd stop the nutes with that high npk though for many reasons... pk 13/4 from canna sounds similar to yours WMD you only use that for 1week throughout the flowering stage
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Just posted my problem with pics, seeing if you might take a look. I think i may be reading to much and getting to many ideas of what could be wrong lol https://www.rollitup.org/marijuana-plant-problems/503991-pics-phosphorous-def-roots-choking.html#post6953101
 
maps84

maps84

Well-Known Member
Take pictures of the whole plant please. We'll try to get you through your issue and find the culprit.
 
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Brokerj

Active Member
How can you say that it is absolutely p and calcium? Reeeeeeally mate? It's clearly a burn..... It has been overfed, the best thing you can possibly do is have a nice rinse off with a couple of teaspoons of Epsom salts and cut your nutrient feed back by half .... Give it 3-5days... You will see this is 100% definitely not calcium in anyway whatsoever....I get amazed sometimes by people who literally write random advice that without doubt will ruin the poor guys plants.
 
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Brokerj

Active Member
Twiggiams said:
Just posted my problem with pics, seeing if you might take a look. I think i may be reading to much and getting to many ideas of what could be wrong lol https://www.rollitup.org/marijuana-plant-problems/503991-pics-phosphorous-def-roots-choking.html#post6953101
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Twiggiams... I only wished people had helped me out when I had all of my complications... Unfortunately i didn't know about this site back then..... How about you add me... And we can look at the pics. Could be simple... Or could be complicated so will have to see pics
 
maps84

maps84

Well-Known Member
Brokerj said:
How can you say that it is absolutely p and calcium? Reeeeeeally mate? It's clearly a burn..... It has been overfed, the best thing you can possibly do is have a nice rinse off with a couple of teaspoons of Epsom salts and cut your nutrient feed back by half .... Give it 3-5days... You will see this is 100% definitely not calcium in anyway whatsoever....I get amazed sometimes by people who literally write random advice that without doubt will ruin the poor guys plants.
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Leaves are not crispy neither the tips are burnt, the spots are brown with a darker colored edge rather than rusty and necrotic, also you can see signs of chlorosis around them. Have you read any theory at all? or just like to bash other people's opinion without putting any agurment over the table? You're suggesting Epsom Salts would be the miracle cure of his problem. I tell you this: Epsom salts is Magnesium Sulfate in case you didn't know. it's an Ionic element that interacts with the PH of the solution and problems caused by overfert (burns, lockout, increased sensitivity to heat and salt built up) will be exacerbated by yet another salty substance entering the mix. Problems caused by insufficient Calcium in the water are not solved by adding a Magnesium compound. You have to add Calcium.
 
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Brokerj

Active Member
I have decided to not continue to read your response beyond line 2 as it's seriously wrong. Epsom salts will give it the injection of MAGNESiUM that it needs.... I suppose the fact that I have had an identical problem and fixed it with those methods would be the reason I am making that suggestion....if you took 20seconds of your time to look at my profile threads rather than type incorrect assumptions possibly you might of lowered your pride and agreed. The fact that you think nute burn is only visible when leaves are crispy and drying is amusing though... Thanks for the giggle maps.
 
ismokealotofpot

ismokealotofpot

New Member
bingo maps84 calcium it is. seems to be a common problem. your p and k are locked out because you dont have calcium to absorb magnesium because you dont have magnesium you dont have p and k. are you confused yet?
 
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Brokerj

Active Member
Are you being serious? Have you encountered this yourself ?.. Because I have maybe 2weeks ago... My plant was a mirror image. Calmag? Wooooow. Good luck with your plant mr thread maker...follow these guys.... Calcium will sort your problem apparently. Lol. I'm out of here.
 
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