Flowering leaf discoloration...

[Tyga]

So i'm about 2 weeks into flower and I've started to notice lot's of my strains leaves starting to look like this in the pic below. They are in a Ocean forest perlite mix 70/30 in 3 gallon grow bags. Currently being fed only Maxibloom at around 5grams per gallon roughly (700Ppm) PH-6.5. Pretty sure it's not overfert considering my Ppm's are rather low and I usually run a little higher with no issues. Using aerated tap water.... Just trying to figure out what kind of deficiency I'm dealing with here. I've tried giving them a spray down with magic green (High in N) Didn't seem to do much... so I hit them with a little cal-mag and that didn't seem to help either. A Little stumped with this one...

 

[SeaMaiden]

Whole plant, please. Also, I seem to recall reading somewhere that N is not able to easily pass through stomata.

One leaf shows reddened petiole indicative of N- or P-. So, if it's low down on the plant it's a natural occurrence, with N being translocated from older to newer tissues.

If it were a Mg-, the foliar of Cal-Mag should have brought a bit of green back up. However, to double-test that theory you can use MgSO4 (Epsom salt) at a rate of 1/4tsp/gal of water as a foliar. IF you see greening back up then that suggests a Mg-. I think it's less likely, though.

Since you're still within that two week post-flip stretch, I say give her a good dose of N.

 

[joe fresh]

how often do you feed/water? have you checked ph runoff?

 

[Tyga]

how often do you feed/water? have you checked ph runoff?

Using blumats so theres no run off :/

 

[joe fresh]

Using blumats so theres no run off :/

up the feed to 1.8 ec...(900 ppm) imo, i hand water in promix and am feeding 2.0 EC every watering with no ill problems, so my guess is with a drip system you can do this as well with no ill effects...


so my guess is your plants are still hungry....but whats the runoff ph?

it might be a ph issue but you wont know till you check it

 

[Tyga]

Okay well I upped the PPM's to around 950 PH is sitting between 6.4-6.7... Feeding 7g maxi and 3ML cal-mag per gal. and Here they are! Very tempted to scrap this grow right now...

 

[SeaMaiden]

Wholly shit, that's a good bit worse. If it were my grow, I would begin using water only, remove what's badly affected, and reassess. I would also start making worm casting teas.

I can't remember what you said the medium is. Soil? No... kinda looks like a soilless mix. Maybe it's time to start treating them like they're in coir, pH lower.

 

[joe fresh]

i see some heat stress there...whats the temps at? might wanna lower it a bit

 

[Tyga]

Wholly shit, that's a good bit worse. If it were my grow, I would begin using water only, remove what's badly affected, and reassess. I would also start making worm casting teas.

I can't remember what you said the medium is. Soil? No... kinda looks like a soilless mix. Maybe it's time to start treating them like they're in coir, pH lower.

Its a soil/perlite mix, I flushed them today... Just worried if i give them plain water they will start showing more defficiencys :/

 

[joe fresh]

when i flush i like to make sure that right after they get a dose of nutes so the roots dont get starved and go into shock...this way you rinse out the salts and keep the plant healthy by not starving it

 

[Tyga]

i see some heat stress there...whats the temps at? might wanna lower it a bit

Sometimes tenps creep into the low 80's, but im also supplementing with co2 so i don't think thats an issue...

 

[joe fresh]

well then, all i can say is give em a good thorough flush and then a dose of nutes so they dont starve, looks like it may be salt build up...whats the runoff ph/ec?(when you got a problem its worth hadwatering plain water to collect runoff to see where your problem is)

 

[Maj.Cottonmouth]

Might be just me but I would cut out the Cal-Mag unless the plats start showing a def of one or the other. An overabundance of one element can lock out other elements. I run Maxibloom with tap water and my Cal-Mag is going to go bad because I never use it.

 

[Tyga]

well then, all i can say is give em a good thorough flush and then a dose of nutes so they dont starve, looks like it may be salt build up...whats the runoff ph/ec?(when you got a problem its worth hadwatering plain water to collect runoff to see where your problem is)

Well I flushed them yesterday with plain Ph'ed water and the blumats are still hooked up to the rez still filled up with nutes so once they start to get thirsty again they will be hit with nutes. Next time i change out the rez I will cut out the cal mag. Hoping for the best! Ill keep you guys posted.

 

[stinkhairs]

maybe a high dose of phosporous or potassium, such as canna's pk13/14? At 2 weeks into flower they're starting to want that type of food.