Is this nute burn?

driver77 said:

Looks like your tickling the high side of nutes in a couple of those pics. Although if it's only the upper leaves doing it.....maybe light.
If you include a lot more information it will be easier to diagnose.......nutrients used, medium, container size, plant size, and light intensity would all help here....pic of whole plant usually narrows a few of those.
But it's so slight and the rest that I can see looks happy.......I recommend-burn one

Click to expand...

driver77 said:

Looks like your tickling the high side of nutes in a couple of those pics. Although if it's only the upper leaves doing it.....maybe light.
If you include a lot more information it will be easier to diagnose.......nutrients used, medium, container size, plant size, and light intensity would all help here....pic of whole plant usually narrows a few of those.
But it's so slight and the rest that I can see looks happy.......I recommend-burn one

Click to expand...

desplegado said:

Also thinking it's nute burn bc my tips and curled down and dark green but it also might not
Also might be from the tent so not 100%

Click to expand...

Delps8 said:

I know very little about soil growing or nutrient issues, but based on comments here on RIU and on a few trips to pictures of nutrient issues, I'm thinking that leaves that re turning down and have a dark green coloration have been impacted by overwatering and, for the latter, excess N.

"Light burn" - when using HPS lights, which are gas discharge lights that generate a lot of heat, plants could actually be damaged because of excess heat. When using an LED, it's, loosely speaking, impossible to do that. For one, LED's don't generate much heat but they do get warm. At full power, my lights will get up to a little over 105°. I don't think that's enough to "burn" a plant. It's "warm to the touch". I have seen pictures of plants growing into LED's and they were not damaged but the light levels weren't too high, I suppose.

If light levels are too high, plants will react by "turning away" - they will curl their leaves ("canoe" or "taco") or by rotating the leaf vertically around the petiole. This happens as a result of hormones moving from the light facing side to the light shaded side. It's a phototropic response in the same way that (some) plants will follow the sun over the course of the day.

I don't see any response that would indicate excess light.

The discolored leaf tips could be a nutrient imbalance but they're very minor. And nutrient imbalances can be because of improper nutrient mixture or too many nutrients but they are also caused by issues in the environment. Temperature and RH (VPD) drive transpiration and about 50% of nutrients are taken up as water moves into the plant.

Overall, though, I think these plants look really good. The fact that some of the tips are a little yellow? The first picture seems to be the worst but the others have a lot of nice foliage and they look pretty good. Keep feeding your plants well (light is food to a plant, nutrients are akin to vitamins and minerals).

Growers lose more yield from their crop by not turning up the light than they do by giving their plants too much light because it's hard to cause actual harm to a plant using LED's.

Click to expand...

desplegado said:

The first pic is the worst other plant is the same way so I'm thinking it's the same thing but the 3rd plant isn't showing any signs of that I don't think. Tops the only thing affectedView attachment 5421958View attachment 5421959View attachment 5421961View attachment 5421962

Click to expand...

Delps8 said:

I agree. These photos show signfincantly more yellowing. Not a lot, I'd argue, but enough that it should be dealt with and because it's trending to worse.

This graphic is really help as a checklist:



View attachment 5422030

Temperature, RH (which go together as VPD) are important because they drive transpiration and that drives water uptake which increases nutrient uptake.

O2 isn't an issue since you're in soil and microbes, CO2, and genetics are in play.

Lights good so in addition temp and RH, what's airflow like? Not that it can cause an imbalance directly but, because its influences transpiration which drives water uptake…

Also, it would be good step back from the plants and grab a photo of the plant in the tent. That sometimes helps.

Click to expand...