potassium

  1. C

    Potassium Deficiency or Magnesium?

    High Guys Hope you can give me some clear sight about my lower leafs. 20 gal pot on 3x3ft with LED Lights and alright temp and humidity. Day 22 of Flower in a Croots Mix which is used now 3 times in a row with topdressing after each run. Everything is going fine so far but I found some leafs to...
  2. Rubisco456

    High Potassium is not necessary for flowering?

    Alright, so what is the consensus on potassium in the flowering stage? I've been “doing my own research” on nutrient compositions of various solutions used on cannabis plants in industry and in scientific papers. After all my reading I’m starting to wonder if the hype with high potassium...
  3. Reap911

    Potassium Deficiency? - Living Soil (Day 28 Flower)

    Hi Guys, I hope that you are well. Please can someone just confirm if this is Potassium Deficiency. If not, any help is truly appreciated. Plants have been extremely happy up until recently. I fed the plants a tea I brewed with Alfalfa, Kelp & Worm Castings a week after I top dressed with the...
  4. C

    Optimum Nutrient Levels for Cannabis. A Scientific Study

    A scientific study was published in November 2021 about the optimum amount of nutrients for Cannabis. Increased K had no effect on inflorescence yield. 30 mg/L did not show deficiency nor did 340mg/L indicate toxicity. The study suggests that many commercial fertilizers supplied far too much K...
  5. G

    Help please! Images attached

    I started off With happy frog in red solo cups and had to be away for a week or 2 so they stayed in them for too long. I transferred into 5 gal recently using Big Rootz soil. Considered a super soil they said at the hydro store. They recommended using BioCanna Rhizotonic and BioCanna Vega.. I...
  6. giantcola

    Best Potassium Source for Foliar Application

    Hey guys, one plant of mine is currently showing potassium deficiency. I am foliar spraying her nearly every day with Neem, Nirvana, Aloe and Seaweed. What could i add to the mix to feed her some potassium? I have a bottle of diluted potassium silicate which provides around 4% potassium. Could...
  7. lonkbell

    Nutrient Burn or deficencies?!

    Hey, I've been growing some LSD-25 autoflowers, they're currently around day 33, been growing nicely in some bat mix by house and garden, but I've noticed the lower leaves browning and curling, and I cannot identify why for the life of me! It seems like it could be nutrient burn, so I flushed it...
  8. J

    Possible potassium deficiency

    As seen in the pictures its looking a bit sickly. It looks like a potassium deficiency but I’m still vegging. Growth has defiantly been slow down. I’m growing in an organic living soil so I think I need to adjust my recipe for next time. Already fed them compost tea and now I’m making a banana...
  9. Cinco

    First grow, in coco - was going fine, until it wasn’t.

    Well, it’s my first grow, and I have 2 of 3 plants showing what looks to me to be a potassium issue. However despite having been a member here for 12 years (holy shit) this is my first post and and grow. Pics, and then grow info below: How it began, small spots on old growth The worst of it...
  10. Weouthere

    Shit spots! Potassium/Phosphorus Deficiency?

    Hey y’all! This grow has been going great up until this point. I’ve noticed some shit spots or like bruises on the leaves, as well as some rust spots (like calcium deficiency) on my ATF plant. 4x4 Tent 480w Meijiu board (3500k) Ffof/happy frog (50/50) with 3 parts perlite, 1 part EWC. Water with...
  11. L

    Potassium deficiency fix? Dark spots on leaves

    Royal Dwarfs: (1x 7 weeks and 1x 9 weeks) 8L Fabric Pots 6.3Ph water/nutes BioBizz BioGrow, Bloom and CalMag (Been following the feeding schedule since I flushed) Growing in BioBizz Light Mix Soil Only LST Jamaican Pearls: (2x 4 weeks and 1x 5 weeks) 9L Fabric Pots 6.3Ph water/nutes Same Nutes...
  12. P

    What toxicity is this?

    Hi! The new leaves of my plant look weird! The old ones are really dark mayne nitrogen toxicity Im not sure! Can you guys please help me? Cheers:weed:
  13. giantcola

    Different NPK ratio for different stages of flowering

    Hi everyone, i would like to ask a question to the top growers here, but also share opinions about our experience: which NPK ratio do you think works the best for each phase of flowering? Meaning transition and stretch, then early budding, bud swelling, and ripening before an eventual flush? And...
  14. Dontjudgeme

    Bloom booster

    What’s up fellow growers, just curious if anyone has ever heard of flower fuel. See picture for reference. Looking to get some higher PK ratios during flower and ran across this stuff. If you know of anything better please feel free to mention it. Looking to get something before my clones are...
  15. S

    Struggling with nutrient issues (PICS)

    I have a really old momma (3months) I used to clone that I am trying to get ready to flower. The soil is buildasoil living soil 3.0 I’ve been adding 5ml of cal mag per gallon and use about 1/3-1/2 every time I water. The light is a 630 cmh. I just transplanted to a 7 gal pot about a month ago...
  16. J

    Save a tree today.......

    Hello anyone have any idea what my problem with my leafs are im thinking maybe potassium def my tap water is 7.2ph very high in calcium maybe think might be my problem? humidity is very low 30% but was fine all last grow im useing dolomite lime to keep my ph stable as ive had a few ph pens not...
  17. B

    White Bleach Spots

    Does anyone recognize the cause of these white spots on the leaves of my plant? This is a plant that has not been taken care of and probably has multiple deficiencies. I do not want to know how to fix these deficiencies, I just want to know the cause or specific nutrient that is making these...
  18. B

    Weird leaf twisting. K deficient?

    My plants are 5 weeks into flower (growing in coco/perlite), and I am noticing leaf twisting on a lot of small fan leaves and sugar leaves. I also noticed some brown spots on a couple large fan leaves, and leaves with other deformities (like missing lobes, missing tips, two lobes growing stuck...
  19. kuruth

    Can't seem to get it right

    New grower. One full harvest under my belt, and a second one soon. Problem with my veg plants that 4x blue cookies from seed 2x4 closet currently in 3 gallon fabric pots Canna Coco+Perlite Canna A+ Canna B+ Cal-mag PH ~5.8 room temp ~24 Celsius/77 Fahrenheit RH ~65 I planted these "Blue...
  20. B

    Deficiency or nutrient burn?

    I am growing in coco under LED light, and I'm starting my 4th week since the 1w/12 flip. Only a few leaves are exhibiting twisted tips with browning on the leaf serrations. There is also yellow tips, so I think I'm seeing nutrient burn. I was only using 500-600 ppm nutrients (450ppm of base...
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