Auto AK deficiency or heat stress?

86Hemphill

86Hemphill

Active Member
Hey all! So I've got a single Auto AK47 from ILGM. Grow conditions:

Sprout on 4/20 - 41 days old
3g of FFOF
Veg'd first 30 days under 2ft4lamp T5s
Now under Mars Hydro 600w
20x36x63 Apollo tent
Upgraded to 4" 190cfm fan last week
Water with 2g non chlorinated tap every 3ish days
Have fed twice now with Heavy 16 Bid A&B
-- quarter strength each time.
Water/Feed/water schedule.

The problem is that I have recently developed brown/brittle spots on my fan leaves only. I'm thinking this could either be a deficiency/toxicity from recent feeding or from heat stress.
I upgraded to a Mars Hydro 600w a little over a week ago and wasn't prepared for the temp increase. I had temps in the 90s for two days before I was able to knock it back down to about 82.
I am also noticing the fan leaf stems turning purple on the top portion of the stems. And I know that the purple stem could be from a variety of reasons though I thought it may be more serious due to the spotting of the leaves.
Check out the photos below and let me know if you have some ideas or need any more info. Side note : these pics were taken before a watering. Thanks!



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86Hemphill

86Hemphill

Active Member
Awesome links! I've tried the stickies on here but all of the photo links have been dead for quite some time.
I think I'll pick up some mag/cal from Home Depot and maybe switch my nutrients as well.
As far as watering, I'm letting the water runoff until it stops before returning it to the drip tray. The soil seems dry and is light when I lift the pot. When I feed I am only using 1g and not allowing runoff.
I have heard bad stuff about Heavy16 but figured I would use what was left of it. What's your thoughts on switching to the fox farms trio?
I would think the fox farms trio would fix any P deficiency since I'm using their soil already.
 
$bkbbudz$

$bkbbudz$

Well-Known Member
One other thing...you said you had a 4 bulb t5 fixture as well? You could use it as well for side and under canopy light...no such thing as too much light.
 
$bkbbudz$

$bkbbudz$

Well-Known Member
Your plant is 1/2 way or more finished...changing now will not add much benefit. I use the FFHF and have always used the FF products as well. The nutes are mostly synthetic...not necessarily a bad thing...they always worked well for me. I am changing over to the General Hydroponics Flora Series Trio for my next grow. I am wanting to go organic and while I don't believe the GH products are 100% organic...they are closer than FF nutes.
 
$bkbbudz$

$bkbbudz$

Well-Known Member
86Hemphill said:
True! I have the 100w cfls on the sides now. My plan was to sell the T5 fixture to another grower.
Click to expand...
Yeah...I was also going to say that all 3 of those light sources can be closer to your plant...a lot closer. The cfl can be as close as a couple of inches and the LED can go down a few as well.
 
$bkbbudz$

$bkbbudz$

Well-Known Member
86Hemphill said:
Water with 2g non chlorinated tap every 3ish days
Click to expand...
86Hemphill said:
As far as watering, I'm letting the water runoff until it stops before returning it to the drip tray. The soil seems dry and is light when I lift the pot. When I feed I am only using 1g and not allowing runoff.
Click to expand...
I am a bit confused now?? How many times and how many gallons of water (including feeding) are you adding per week on average?
 
86Hemphill

86Hemphill

Active Member
$bkbbudz$ said:
Yeah...I was also going to say that all 3 of those light sources can be closer to your plant...a lot closer. The cfl can be as close as a couple of inches and the LED can go down a few as well.
Click to expand...
I originally had the LED closer but was afraid I was stressing her with heat. Not that I feel comfortable it's something else, I'll drop the LED back down.

I feed 2-3 times a week. Pending when the pot feels dry by weight and the top inch of soil is dry. She seems really thirsty right now. Or maybe I'm an idiot and I'm over watering lol. My RH is relatively low and the temps have been high.
Alternate water/feed/water. 2g and allow for runoff when I water and only 1g and no runoff while using nutes. So roughly 4-5g weekly but some of that is runoff.
 
$bkbbudz$

$bkbbudz$

Well-Known Member
86Hemphill said:
I originally had the LED closer but was afraid I was stressing her with heat. Not that I feel comfortable it's something else, I'll drop the LED back down.

I feed 2-3 times a week. Pending when the pot feels dry by weight and the top inch of soil is dry. She seems really thirsty right now. Or maybe I'm an idiot and I'm over watering lol. My RH is relatively low and the temps have been high.
Alternate water/feed/water. 2g and allow for runoff when I water and only 1g and no runoff while using nutes. So roughly 4-5g weekly but some of that is runoff.
Click to expand...
HMMMM...I grow in 5 gallon pots and I have never given my gurlz more than 2 gallons per week. So, you are giving them more than 2X the amount of water in 3 gallons....I still say you may be over-watering. But, hey it is your grow and if you say they are dry, thirsty, and light in weight...than who am I to quibble about it?...LOL! I love the word 'quibble' HAHAHA!!!
 
86Hemphill

86Hemphill

Active Member
"Quibble" haha. I may be brother. I watered this morning so I'll check from the bottom of the pot next time I think she's dry. Thanks for all the input!
 
J

j00ster

Member
You shouldnt be having any definciencys in ffof this early in a grow, and imo dont need to feed till passed 2 months in the soil. Ffof is already full of nutrients needed. I have done npk soil and run off tests to show this on some extremelly heavy feeders. The purple stems can also be cause by a ph or heat stress.
I also see maybe a light nute burn. If you do want to feed, id back the feedings off every 3rd watering
Have you dont any run off tests. Also id suggest going to your local hydro, or hd/lowes and pick up a cheap npk test. Theyre like 10-15 bucks, and you can get refil pills. I have found them to be pretty spot on compared to when ive had my soil samples sent off. The only thing they dont tell you is your cec and organics. But if you leave the npk tester to sit for a minimum of 4-6 hours, depending how much your mix it. They are pretty accurate
 
86Hemphill

86Hemphill

Active Member
I've heard that as well that FFOF was hot enough to carry a plant into late flowering. I'll check out my store and see what they have! Thanks!
 
86Hemphill

86Hemphill

Active Member
Here's an update :
Have not watered since Monday (4days now). Leaves are worsening and moving further up the plant. I have some cal mag and tiger bloom on the way and are set to arrive today. I will not be going back to Heavy 16. Last time I grew I seemed to encounter similar issues immediately after introducing Heavy 16. Though last time I started the nutes off at double strength by accident and assumed all my issues came from shocking or a lock out.
I will continue to post updates after introducing the cal mag and tiger bloom.
Should I introduce them individually or would it be ok to go with both?
 

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86Hemphill

86Hemphill

Active Member
Another update. I have since watered/fed twice. I fed first with cal-mag and 4ml of Tiger Bloom. I watered with cal-mag only about 4daus after. I am now showing signs of N-tox & deficiency?? And generally terrible looking leaves. Buds are not fattening as I hoped (probably due to stress) and I'm overall not happy. Feels like I'm chasing a ghost here and wish I had never introduced nutes at all...
Any input would be greatly appreciated.
Also, this is day 50
Thanks
 

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trippytrappy

Well-Known Member
Looks like you should of topped up a little with N just after started flowering to make sure they had enough to last through the cycle .
I use house and garden bat special and its probly got same EC as FFOF , I veg for 4 weeks in 1ltr pots then into 11ltr bags , and after 1st week off 12/12 give them 1ml per 2tr water of plant magic veg , just to keep the Nitrogen flowing , Then 3rd week of flower give them 2ml per ltr of plant magic bloom , and thats it , Two feedings throughout the whole plants life cycle , i do give them a blast of mollasses round about week 4 flower for sugar boost and also a sorce of cal/mag suppliment plus other micro benifits mollasses has ,
 
86Hemphill

86Hemphill

Active Member
Nice! I think I'm going to keep feeding at 1/4 strength instead of holding off nutes. Light N and some PK boost. Then flush well and molasses toward the end. Thanks for the post trippy!
 
Awkcyde

Awkcyde

Member
following this... I'm having the same issue here and I've done some reading on it and it appears to be an issue with the fox farms ocean forest soil. Is that the soil that you're using ?

I don't water or feed as much as you and my leaves look almost identical on a different strain so gonna follow this thread.. Let you know if I figure anything out as well
 
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