Bleached leaf edges, spotting to some leaves

[mrsgreenfingers89]

I am guessing some sort of nitrogen toxicity. I recently underfed these babies, and they just didn’t grow, I had a feeling I was overwatering but soon came to realize it was the lack of watering/nutrients that was causing my issues. The plants then started to grow vigorously and have now come across this issue in 4 of the plants.

Any help to this new grower would be much appreciated

• Room Size – 8ft x 5ff​
• Lights – 1x 600w LED & 1X 300W LED​
• Strain – Runtz Muffin​
• Growing Medium – Coco​
• Nutrients – Canna Coco​
• RH – 55%​
• Temperature – 22c​
• Extraction - 8 inch CarboAir​

I have been feeding everyday for the past week with the following –

5 litre mix
A – 10ml
B – 10ml
Rhizo – 10ml
Cannazym – 5ml
Calmag – 2ml

The water is then PH’ed to 5.6

 

[mysticepipedon]

First my disclaimer: I don't know shit about coco.

Are these under LEDs? If so, try turning them down a little bit or raising the light a bit. It isn't intuitive, but it seems that lower leaves can get burned under LEDs, when the plant takes some nutrient from them to feed upper leaves and you get a burn pattern like the one in the last pic.

 

[mrsgreenfingers89]

First my disclaimer: I don't know shit about coco.

Are these under LEDs? If so, try turning them down a little bit or raising the light a bit. It isn't intuitive, but it seems that lower leaves can get burned under LEDs, when the plant takes some nutrient from them to feed upper leaves and you get a burn pattern like the one in the last pic.

Thanks for your reply, yes they are under LED's I have now moved them to around 28inches above the top of the plants and lowered the power to 50%.

Would you say it is more likely to be light burn than nitrogen? I noticed one plant with claw like leaves, I will attach a photo when next visiting them.

 

[Ponky]

I use peat. When that happens to me it's a smidgen too much fertilizer.