It's still phosphorus problem late stages now
Check temps and ph
Are the leaf stems red too ?
What's the new growth like?
What are you feeding?
Have you sprayed anything?
looking good n there bro keep it up lad..........
looks like P is locked out due to cold get the old heaters out mines coming out later !
Purple to black dots usually indicates P issues but looking at your pics it doesnt really look like that to me. Have you checked the roots for any rot or pests? Get a lights off pic mate, its hard to see with the glare of the HPS.
Peace,
HGO
Hmm is that a block of wood in the pic?
What other materials you got in there as it could be off gassing
Check your runoff ph and ec
The timber is for holding up the tent as the lights r pretty heavy so it's a daftest precaution really it's got a smooth finish other than that nothing out of the ordinary.. I shall check ph and ec run of and post up Monday eve cheers bud
Cover wood with some reflective material wood carpets glues etc can give of gas that poisons your plants
also too much K in coco can cause all sorts of problems with nutrient uptake
I wouldn't do that just yet manganese is a trace element which it's availability will have more to do with primary nutrients
Adding more won't make the nutrient more available
Need those ph and ec reading from the runoff
Bottom feed in autopots ?
Remove pot from tray place saucer underneath take a cup and hand water from top collect waste and take readings
Coco absorbs and stores K too much messes with the cation exchange rate
What's the npk of the base feed and how much are you giving them