Ideal Temp Range Vs Lighting To Aid Stunted Plants - Veg

[blazeup420]

Just wondering what you guys would say is the perfect temperature?

I have 1200 watts total on 18/6 and my plants are stunted, they been through the wars a bit though. Cold start. Topped too early. Cal mag def. and nute burn.

Recently adjusted soil ph to around 7 the new growth is fine for the most part. They are just growing very slowly. Temps can get up to a max of 85 and humidity is about 40%

Bigger one of the two is 8 weeks old and 6 in tall. Should I turn some of the 300w LEDs off? And burnt the temp down? Or?... what am I doing wrong. These are sativas they're supposed to be tall!

 

[blazeup420]

Also I meant bring* down temp, not burnt

 

[blazeup420]

And that photo was after bringing the soil down. It's not normally wet like that I am slowly getting watering OCD under control.

 

[DemonTrich]

In veg I strive for 80-85*f and 65-75% rh. Check the vdp chart for a o
good start matching tour temp to ideal rh. Imo, 40% rh is way too low. That alone will cause plants not to grow as properly as they could.

 

[jumpincactus]

1st thing that jumps out at me along with what @DemonTrich added is at a ph of 7.0 in soil is going to stunt your growth due to limited nutrient uptake. I run all my soil runs at 6.3-6.5 with great results.

 

[blazeup420]

Yeh I'm really trying to bring it back down. The soil original ph was 6

I just turned one light off making it cooler and rh went up to 50s

 

[v12xjs]

Is there signs of bleaching on those leaves? Hard to tell from the pic.
Not sure it applies to you but I have my young guns under a 20w white light until they are ready to flower, and when I first used it I had to tie some card across the glass to tone it down as it was killing everything. The only thing I changed was to reduce the light a little and everything went back to normal.

 

[blazeup420]

@v12xjs Na no bleaching. Don't think... I will also be Ordering some hoists this week.

Yeh I think the lightin I have is a bit overkill as well. Hence why I turned one off. The majority of lights are going to a flower room soon