Is This Heat Stress?

[Mustbob]

Hello AFN

I am growing Lemon AK Auto and Blueberry Auto. I just harvested top of Lemon Ak's. She has completed 12 weeks. But as you can see she is not normal, airy and small buds with dry sugar leaves. 4 weeks ago i had to carry these girls to my friend's home. I had to use a wardrobe with low air circulation. Temperature wasn't exceed 28 C, and humidity was around %38. Distance between light and top of plant is 20cm.
Do you think the cause of this very little harvest is low air circulation or too much Nitrogen or what?

Please can you help me to find the main cause that? Because the blueberry still has 4 more weeks. The last pic. belogs to blueberry growing in a same wardrobe
for your valuable ideas

 

[Mustbob]

Any comment?

 

[Arthur]

A lot more info is needed to even begin here...
Soil? Coco? Type? Nutrients? How much? How often? An rH of 38 when? All the time? Then too low. Even in flower that's a bit lower than I'd like. PH? Ppm/ec?

Type of light, power etc... 20cm is not a lot of distance, with my lights that would fry plants, with maybe a quantum board, you might be ok.

Many things go into getting a large harvest (one of the biggest is skill) , not going to be able to help with just a couple pics of the plant.

Just off the looks, I'd raise the light, but am betting there is a bunch of other things that are affecting your final weight.

 

[Mustbob]

A lot more info is needed to even begin here...
Soil? Coco? Type? Nutrients? How much? How often? An rH of 38 when? All the time? Then too low. Even in flower that's a bit lower than I'd like. PH? Ppm/ec?

Type of light, power etc... 20cm is not a lot of distance, with my lights that would fry plants, with maybe a quantum board, you might be ok.

Many things go into getting a large harvest (one of the biggest is skill) , not going to be able to help with just a couple pics of the plant.

Just off the looks, I'd raise the light, but am betting there is a bunch of other things that are affecting your final weight.

Medium is soil. I didn't give the details because the other parameters are constant. I was harvesting around 50g dry per plant with same light (250W COB Led) and same amount of nutrients (Biobizz acording to receipt.)
Until i need to change the enviroment everything was perfect. I am just asking that poor air circulation in a small tent will cause this burnt buds? The blueberry is in the 2. week of flowering stage and losing her leaves too much.

 

[Arthur]

No poor circulation won't cause burnt buds. It can cause mould if the rH is high enough, and I suppose if there is no air exchange going on outside to inside, then the CO2 level has crashed. If that happens, overall size of the plant would be smaller.

All your damage is on the top of the plant. That would point to light intensity or heat.