Light burn or potassium deficiency??

KyKamper · Jul 13, 2017

I am trying to figure out if this is a potassium deficiency or light burn/heat stress.
I am growing indoors, in ocean forest soil. I am 3 weeks into flowering on an auto flowering northern lights. I mainly water when the soil is dry, about 2-3 times a week. Every other watering contains fox farms tiger bloom, grow big, and big bloom at the recommended dosage for each. My ph is between 6-7.

It started looking like nute burn at the tips but has progressed. Most of the damaged leaves are at the tops of the plant but some are lower. It also starts with small brown dots.

Thanks!!

firsttimeARE · Jul 13, 2017

Looks like a lot of deficiencies. P, K, N

I wouldnt be surprised if you had nutrient lockout somehow

I will let someone who grows soil comment.

CriticalCheeze · Jul 14, 2017

KyKamper said:
I am trying to figure out if this is a potassium deficiency or light burn/heat stress.
I am growing indoors, in ocean forest soil. I am 3 weeks into flowering on an auto flowering northern lights. I mainly water when the soil is dry, about 2-3 times a week. Every other watering contains fox farms tiger bloom, grow big, and big bloom at the recommended dosage for each. My ph is between 6-7.

It started looking like nute burn at the tips but has progressed. Most of the damaged leaves are at the tops of the plant but some are lower. It also starts with small brown dots.

Thanks!!

pic of whole plant?

Rolla J · Jul 14, 2017

What size pots? I use 3gal for flower fox farm ocean perlite. I definitely dont water 2 to 3 times a week.. More like once every 6 days. Consistently in flower is crucial. You r probably drowing the roots too much to the point the roots cant breathe and uptake your nutrients.

CriticalCheeze · Jul 14, 2017

I'm thinking lockout possibly. Especially with the fox farm nutes. Those tend to be pretty strong. FFOF is hot out the bag too.

Rolla J · Jul 14, 2017

CriticalCheeze said:
I'm thinking lockout possibly. Especially with the fox farm nutes. Those tend to be pretty strong. FFOF is hot out the bag too.

Very true. I always up pot to flower with that soil with added perlite calcium and epsom salt. I introduce like 1/4 tsp of tiger bloom to a gal and only give like 3/4 of a gal like between the 3rd or fourth week after transplant. Idk guess people are different. Also using all those nute can throw your ph way whack. I sometimes fill half way with good 6.4 water. Then tiger bloom drops it to around 4.7. Then i use my sink water which is like 7.2 to fill the rest of my jug and it gets around 6.2. Other times i have to use ph up.

Rolla J · Jul 14, 2017

I hardly ever feed. and when i do at most i really go is 1tsp per gal 2 times in flower. Whole grow i just water really. Strains are different tho

KyKamper · Jul 14, 2017

Here are some pics of the whole plant. Thanks for the replies, it sounds like nutrient lockout from what everyone is saying. I talked to my local shop and they said the same thing you guys are saying. They recommend using water with no bites for the next week to see if it recovers and maybe using sledgehammer to rinse it. Good to know it's not light burn.

By the way, how do I like people's responses??

KyKamper · Jul 14, 2017

Rolla J said:
What size pots? I use 3gal for flower fox farm ocean perlite. I definitely dont water 2 to 3 times a week.. More like once every 6 days. Consistently in flower is crucial. You r probably drowing the roots too much to the point the roots cant breathe and uptake your nutrients.

The pot size is about 3 gallons. I don't have a lot of vertical space so I took a five gallon fabric pot and cut it down so its wider than it is tall.

KyKamper · Jul 20, 2017

UPDATE: my plants condition has continued to deteriorate :-x

. More leaves have turned yellow mostly at the top on the newer growth. They have also curled upwards. I have trimmed all of the affected growth off. Its close to harvest and I'm not sure she's gonna make it :sad:

. With nutrient lockout as discussed earlier should I have used a cal-mag solution??

Johnei · Jul 20, 2017

Have you tried raising your lights a bit? I think you have a few issues going on at once, and I think lights too close is indeed one of them.

KyKamper · Jul 20, 2017

Johnei said:
Have you tried raising your lights a bit? I think you have a few issues going on at once, and I think lights too close is indeed one of them.

Light are as high as they'll go. Not a lot of space. The temps are 68-70 degrees

im4satori · Jul 20, 2017

to me they look like theyre over watered.. I heard you , you said when dry but they look water heavy

and the fox farm fert directions are way to strong

an appropriate amount might be something around 5mls of each

KyKamper · Jul 21, 2017

I thought leaves dropped down when overwatered?? My leaves are curling up

im4satori · Jul 21, 2017

they drop when theyre young and over watered

when theyre large the kinda yellow out like N def but not always drop

curl up like a canoe or taco is usually magnesium, or light/heat stress and in ph related issues

ive also recently believe ive noticed soil symptoms might show slightly different than hydro symptoms for certain elemental imbalances.. bu this is an un-proven theory I have while I sleep ..lol

Light burn or potassium deficiency??

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