Pottasium def. or Nutrient burn?

Lalalando

Lalalando

Member
Hello guys,
I've been facing some problems with my plant for a week now.
Info:
- Amnesia Haze (photoperiod)
- Soil
- 3rd week of flower
- organic nutrients - biobizz
Problem description:
At the beginning it looked (to me) like nutrient burn (brown tips curled down), then also edges of leaves did get the brown "burn", later I've also noticed leaves yellowing.
Is it nutrient burn, pottasium deficiency or overwatering?
Thank for your advices!
Pictures:
 

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Well-Known Member
K is mobile, so deficiency starts at the bottom and moves up the plant. Burn happens at the top and affects the leaf margins.
 
MustGro

MustGro

Well-Known Member
could be potassium, but the first 3 pics don’t look it to me. The 4th one has the burnt edges I associate with K def though. In the 5th pic it looks like the edges are getting light and working their way toward a burn, but there’s a lot of strange coloring in those leaves in that pic.
You mentioned overwatering, how do you put fluids on?
@HydoDan knows his shit and could be right with nute burn too. I wonder if it’s too much nutes locking out the K?
 
GroBud

GroBud

Well-Known Member
Nutrient burn, if you're using liquid nutrients what's your runoff ppm reading? I've used this chart in the past. Each plant is different some want more some less, but I've never had a toxicity using this chart. Once you get a run off reading either just water until ppms drop, or just add enough food to equal the amount you're feeding. Like if runoff is 800ppms but you want 1,000 next feed just feed 3 to 400 ppms. The amount you were missing plus take into consideration how much was depleted since last watering. If toxicities or deficiencies start becoming an issue just get frequent runoff readings, you'll begin to understand how plants feed. Also wouldnt hurt to check ph by runoff or slurry test.

The charts is based on using r/o water with a base ppm of 0

If you're using liquid nutrients and your not allowing for run off get pot elevators and start giving 20% runoff each water and feed. Allowing a runoff will decrease the chance of salt and nutrient build up. Less is more concerning liquid nutrients if toxicities become an issue you can also flush in between each growth stage resetting medium. Not recommended but that'll help clear the scale for a boost in added nutrients.
 

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Observe & Report

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GroBud said:
If you're using liquid nutrients and your not allowing for run off get pot elevators and start giving 20% runoff each water and feed. Allowing a runoff will decrease the chance of salt and nutrient build up.
Click to expand...
If you don't have any runoff, how long will it take to get a salt and nutrient build up?
 
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