:smoking:...I'm with HM, pH check is needed,... and are you feeding every time you water? In coco, this is recommended, but the amount used must be smaller, and proportioned to the size of the plant, and therefore uptake,... coco is not like a soil, and has peculiar CEC characteristics,.. high Ca demand and if it's not well processed, a lot of native K,... symptoms are similar for both defc. and toxicity with K in coco, but nute burn may manifest like this too,.. only thing having me think twice about that is the tips of many leaves seem okay, no yellow/burn,..I think? we need more pics, side shots of plant, close up of some affected leaves please,... coco pH is best around 5.8-6.2,.. that in-pot pH is critical mate, do you have a pH meter for testing liquids?
You gave me some good points man. So do I feed everyday cause it is said you cannot overwater in Coco.
And I dont have CaLMAg, I live in India, cant find no where and it costs a bomb to import from the USA. A quart of Botanicare CalMAg is like 120$.
So I have ordered dolomite lime. Hopefully that should work. Also, am using tap water so maybe get some CalMag from there. Btw the tap water PPM is 17.
I keep watering with 5.5 ph average but the cocos PH never changes. Its really annoying.
BTW the plant is PHOTOPERIOD !!!! (Heavily Medicated: forgot to mention it above )
I ll post more pics tomorrow.
Thanks for your time.