Top leaves only showing the issue, and is affecting the bigger/older plants. At first I thought it was too much Nitrogen due to the burnt tip but then remembered the leaf would be dark green rather than light.
Being the top of the plant with the issue makes me think it’s a none mobile nutrient that is lacking, and so I’m drawn to a magnesium deficiency?
Hopefully that’s correct but wanted some input before I give them something they don’t need. Thanks guys and keep up the good work.
With so many variables I don't know how anyone could get the issue, but I'll give it a shot. What…
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ooops meant to reply to danka
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This seedling is just starting to show signs of needing a little more nutrition. Not much more as it’s still very young. The lower leaves edge yellowing is a potash indication, not magnesium. Potash has a very wide pH range so your pH is not the most likely issue. How is nutrition being provided?
Likely excess calcium locking out potassium.
Cheers guys, I’ll make sure not to add any more calcium, I’m running Vitalinks Coir Max range, and these are autos so only lightly feeding, I’ll knock off the extra calmag and up the AB a touch and hope for the best. Cheers