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AK-48 issue - Nute burn or Potassium deficiency or am I off?

Zekzor84

New Member
Hi, this is my first grow and I'm at flowering stage 19 days . Starting to be worried about those burnt tips that are also slowly getting on the sides of the leaves at any height of the plant. Tried to find tips online on good sites and i think this is either a lack of potassium or nutrient burn but I'm really unsure about this. If I'm completely honest since halfway of this adventure i'm weekly adding a reduced dose of 20-20-20 fertilizer I also did add a single dose of 7-15-30 (bud+) about one week into flowering. Typical temp is 75F 38%.

Please, could anyone take a look and provide input on how to adress my situation.
 

Emilya

Member of the Month: Mar 2019 - Grow Journal of the Month: Jan 2020
A potassium deficiency, involving one of the mobile nutrients, would start at the bottom of the plant and move up. This looks more like magnesium. You did not mention your pH... what pH are you adjusting to when you water? Is that soil you are growing in?
 

Emilya

Member of the Month: Mar 2019 - Grow Journal of the Month: Jan 2020
the range in soil is 6.3-6.8. Your pH is low and supports the magnesium theory, since it only becomes mobile above 6.5. Next time adjust up to 6.5 pH and I think that your problem will stop spreading... the damaged leaves will not come back, but at least you will get to harvest time.
 

Zekzor84

New Member
the range in soil is 6.3-6.8. Your pH is low and supports the magnesium theory, since it only becomes mobile above 6.5. Next time adjust up to 6.5 pH and I think that your problem will stop spreading... the damaged leaves will not come back, but at least you will get to harvest time.
I'll begin with stopping the fertilizing and adjusting the water's ph and sticking to water only for a while.
 

Emilya

Member of the Month: Mar 2019 - Grow Journal of the Month: Jan 2020
Hopefully the last gallon of water that you used for your flush was properly adjusted to 6.5 pH. If not, I strongly suggest sending another gallon through... the pH was in my opinion the larger issue.
 
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