Is this heat strees nute burn or both?

strain is critical kush barneys farm day 29 flower nutrients line I advance nutrients ph perfect conno with additives in 5 gallon smart pot coco coir medium watering every 2 days water before last I watered with 1000 ppm run off was 1300 ppm so the next watering I watered with a dose of calmag at ph 5.7 ppm 200 run off was 500 or so I water with 2 1/2 to 3 gal each water cause it usually take 2 to get run off was wondering if this Is burn or heat stress temps at top of canopy 86 degrees just added another fan got temp down to 82 degrees the leaves look ridged and look like there start to fold just wondering what you guys think light im using is 1000 watt hps there about 18 inches from tops. was thinking that I should water them with a light dose next water say 600 ppm then keep them under 800 ppm from now on.

I'm not an expert but it looks like heat stress. You said you recently got temps under 82, i would give it a few days and see how they are looking at that point.
I grow in soil and don't monitor exact PPM of my nutes, just do mild supplementation of the supersoil in flower, so I can't help much there.

i found flowering is much better at cooler temps, unless its a pure sativa. Indica likes the cold to flower. I exposed my plants to light frost a few times thru the flower stage, and they bud so quick you can almost watch them grow. My avatar pic was exposed to frost 3 times, every 2 weeks, I woould try to get temps down to low 70's durning the light cycle and like around 65 at night.

the bud looks good tho!! nice, try to get it cold in there a couple time before harvest, it will up resin production also, during the summer, I would fill a bucket with ice and put in the flower room, Also thro a few cubes right on the soil every day, worked great. Cold also brings out color, deep shades of purple, red ,orange, and some times a blue tint. the best ad vice I could give you is cold, cold cold!! but dont keep it cold all the time.... try to get 45-50 for the night, and see what that does!!good luck and nice grow!!

You have leaf tips curling up could be a Potassium deficiency.
You have leaf edges turning up that could be a sign of a Phosphorus deficiency. I see that at the bottom of the plant too.
Your leafs look like they have a Magnesium deficiency going on. Yellowing between the leaf veins. unless it's your flash from the camera.
Your leafs will fold up (Taco) when there getting to much light. The leaf tries to reduce it's surface area to the light source by folding along the mid rib.

IMO- raise your light if you can 18" is sorta close. (24" - 26")


Good Luck on Your Grow.

sourdieselyumyum said:

strain is critical kush barneys farm day 29 flower nutrients line I advance nutrients ph perfect conno with additives in 5 gallon smart pot coco coir medium watering every 2 days water before last I watered with 1000 ppm run off was 1300 ppm so the next watering I watered with a dose of calmag at ph 5.7 ppm 200 run off was 500 or so I water with 2 1/2 to 3 gal each water cause it usually take 2 to get run off was wondering if this Is burn or heat stress temps at top of canopy 86 degrees just added another fan got temp down to 82 degrees the leaves look ridged and look like there start to fold just wondering what you guys think light im using is 1000 watt hps there about 18 inches from tops. was thinking that I should water them with a light dose next water say 600 ppm then keep them under 800 ppm from now on.

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It is because temps/RH is not in tune with light/hrs and water. Not a big deal, I get that frilled magin tips at times. if it browns that's different then, and I would be inclined to believe it's caused by potassium. Heat stress is going to show itself as resembling a canoe I shape, an I just dont see that in your pictures. Your plants are different from mine so it' a very likely possibility seeing temps are 82. But I run a 82 with my leds and its an ambient not canopy temp. Just make sure the plant has plenty of circulation across/thru the canopy when at 82 and under HID's.

It's a weed and it's origin is in soil (not pots). Pots dry out, in nature mother earth is deeper than any pot, thus the plant can cope with higher temps. Its cooler #1 and #2, there's plenty of moisture, coupled with fungi that seek even deeper than the roots to supply it.
You lack this in a pot- don't completely fret with high temps, just compensate. Water is the key holder of all life on this planet. I would venture to say in your growroom, at 80+, it's the main limitation.

Nice chart top fuel!! Ill use that, I cant really keep all growth in optimal ranges but I have seen some problems with a few of the taller plants which I see are too close. with the switch to brand new equipment, new hoods, new bulbs and so on, it has been a guessing game as to how close to keep the lights. I have 8" raptors and do notice a few "hot spots" with them but they dont burn the back of my hand. The close plants show stress towards the end of the light cycle. and are fine when the dark period ends. Thanks again!!

Some more pics I fed with about 550 ppm today phed to 5.6 and runoff on the 3 were from 550-680 runoff ph ranged from 6.0-6.3