Heat stress?

[Potbellied pothead]

I'm seeing some weird wrinkling on my auto flower plants. They are under a 1000w mh hid and were 20 inch from bulb. I've moved them to 24 inches away as I'm assuming they are heat stressed. Room is 24c at peak and 18c at low. Humidity around 30 unfortunately. Two plants at the back have most visible signs on biggest leaves. Any idea?

 

[fanleaf]

I dont see any sign of heat stress. Low humidity is probably your issue. With lights on and room up to temp I would shoot for 55-65%rh. With low humidity in veg the leafs bring in co2 through their open stomata. When they open the stomata it makes the plant uptake water through the roots. If humidity is too low they cannot sweat out the same amount of water coming in. This sort of water logs the leafs. This also slows photosynthesis. Get your rh up and you will be fine. Overall they still look great.

 

[Potbellied pothead]

Thanks

 

[Big pete 132]

I'm seeing some weird wrinkling on my auto flower plants. They are under a 1000w mh hid and were 20 inch from bulb. I've moved them to 24 inches away as I'm assuming they are heat stressed. Room is 24c at peak and 18c at low. Humidity around 30 unfortunately. Two plants at the back have most visible signs on biggest leaves. Any idea?

I would say low rh is problem i had leaf curling up once and low rh was the problem tem is ok

 

[Big pete 132]

I allso use 1000w hps even on seedlings you have to watch temp and rh to use 1000w lights from start but light hight is very important with seedlings but i find starting in pot you will finish in is a good start

 

[Jackalope]

I have started transfering my plants under the big light sooner than before. I still use the T-5 lights to start seedlings. I agree the sooner you can get your pants under big lights the better start they will get. I am now transferring them after the first repot. When I go to 1 gallon pots. I am transplanting sooner now also. Anything after 4 leaves and they are ready. Because they are in the starting pots for less time I dropped to 4" square pots instead of solo cups. All this just to get plants under the 1000 watt light sooner.

 

[Blew Hiller]

I feel like I already asked this on another thread of yours...but do those buckets have drain holes? Filling that drip tray with water will help increase the ambient RH of that space (I assume that is also a humidifier in the background?).

 

[Potbellied pothead]

Yup. Drip trays. And now that plants are bigger they are putting off their own humidity. Staying around 40.

 

[Potbellied pothead]

Thanks for the responses. Here they are day 39 above soil...