Got a couple plants growing. One of my Purple Kush is showing a deficiency of some sort. Need some help asap identifying. I've heard some leaves die off in flowering. I'm on day 37 of flowering. 7500 lumens psf under cfl Average 75 degrees Humidity 40% Leaves being assholes 23 inches tall 10-52-10 every other watering It started with brown spots so I'm assuming its a cal/mag def but I tried a little gentle foliar feeding and the effected leaves just crisped up, though the lower yellow ones are still soft. Please help me guys!
they're getting nute burn! 10-52-10 is strong bro!!! use something that is more balanced.....or use alot less of the 10-52-10 and mix more of something else with K in there. the other leaves are turning yellow because they cant absorb anything; there is too much of an abundance of P!
with such high NPK im assuming your using boosters. could very well be calmag, but you gotta understand once a leaf goes, its fucked. its never gunna look better, key is to watch growth around effected area and new growth. That will tell you if youve nipped it in the bud. No pun intended.
i personally still think that is too much nitrogen for flowering. for flowering it is best to have an smaller, but adequate amount of nitrogen. you want mostly phosphorus and a slightly smaller amount of potassium than phosphorus (5-21-17, for example).
Way to much nitro for flower! 5% max. Those plants are fried with that strong of nutes every other day! Less is more my friend...