Newer leaves yellowing between veins feel dry and crispy

Hello Community, Got another one for ya! Noticed a couple days ago some yellowing between the veins of the top set of fan leaves. The leaves that aren't yellowing are twisting pretty badly. I'm thinking Magnesium. I did a 1/2 strength watering w/ Cal-Mag. Also have been doing foliar feedings w/ lower than recommended strength FF Nutes. (2Tsp instead of 1Tb Big Bloom & 1/4 tsp instead of 1/2 tsp of Tiger Bloom.) Trying to work on some P + K deficiencies. I hope I'm not overdoing things...

As a refresher; I'm still in 1.5 gal pots, I'm in the 7th week of Veg 10 weeks from sprouting. Been using FF Grow Big for 4/5 weeks. I've switched them from under my nursery fluorescents to under a 1000w HPS 8 days ago. Running 18/6, top canopy about 12" from lamp. Photoperiod highs 81F H44% Nightly lows Avg. 71F 24%. Water at 6.5, runoff is around 6.1. If I'm leaving anything out let me know.

Image1 top view with flash (leaves of concern Bottom left corner)
Image2 Top view w/o flash
Image3 Side leaves with some spotting. w/o flash
Image4 More side leaves showing twisting if you look. w/o flash

went from fluoros to a foot from a 1ker? my guess is a little light burn. Back her off 6 inches or a foot for a week or so and let her grow to the 1 foot distance. bottom leaves look like you might have splashed some butes on the leaves and got a little burn. No biggie there. You going to bigger pots soon?

^^^^ this, id raise that a few more feet

ya I just raised the light to 15" away from the top canopy. Update as things progress.

Planning on transplanting a week before the switch to 12/12, gonna use whole bags of FFOF with hydroton at the bottom for drainage and about 20% more pearlite per bag.

i would transplant sooner rather then later, and still raise the light a little more, you only moved it 3 inches

it might be from ferts and foliar feeding. i personally dont feed my plants that way, just put in water and put in the soil.

the foliar was more of a response to the already progressing condition. And it has helped some of the other plants in the garden.. The condition dosen't seem to be spreading either but the leaves that have it are tacoing more and are really brittle, to the point of crumbling.

Just an update my plant seems to have recovered, Cal-Mag feeding and a light strength FF BB/TB foliar spray for 2 days. The plant seems vibrant and healthy except for the leaves that got the most f*#@d up, unf. I don't think they will recover. At least it's still kicking!

HELP ME PLEASEEE --- I am using a 12 pot IWS system in a 3x3 meter space. with 9 600watt lights. Im using House & Garden nutrients. i am 4 weeks into flower. My plants were really heathy and fine up until a couple of weeks ago. loads of my leaves around the middle top and bottom area started to look like they were burning, then turning yellow they dying. I quickly started to flush them and made sure PH was right and also temperature and lights were high enough. i have done this for over a week now and there still looking bad. its only the leaves and not the stems or buds. i need to start putting nutes back in the water before i run out of time.

rolldacheese21 said:

HELP ME PLEASEEE --- I am using a 12 pot IWS system in a 3x3 meter space. with 9 600watt lights. Im using House & Garden nutrients. i am 4 weeks into flower. My plants were really heathy and fine up until a couple of weeks ago. loads of my leaves around the middle top and bottom area started to look like they were burning, then turning yellow they dying. I quickly started to flush them and made sure PH was right and also temperature and lights were high enough. i have done this for over a week now and there still looking bad. its only the leaves and not the stems or buds. i need to start putting nutes back in the water before i run out of time.

Click to expand...

Seems like a lot of firepower for that space. Are the serrated edges standing up?