I have 14 autos in my room around 50 days from seeds. Some seem to be more mature than others. I run a CMH 1000w + qbs. I think the heat from CMH is the problem. Also some plants have brown spots on leaves. All the leaves have light green yellow edges. I also didn't do any mid grow flush and I water without runoff. Maybe that's the problem too. The CMH produce a lot of heat. I try to control the temps between tops around 28-29° and the rooms temp around 22°-24°. The leaves do tacoing but in most of plants top pistils are ok some not. Also a plant you can see on 1 photo has dead pistils on top and also removed something like pollen sack grown on a little new branch on lower level of plant. Bad day today. I am so confused I cannot figure out what's going wrong with my grow.
Need some help here
- Thread starter Leon1111
- Start date
2Hearts
Well-Known Member
I only want to say that putting a thermometer under the light is wrong and wont be the air temps your reading but the light radiation. If its 22-24 not under the light you dont have any heat problems and mostly causing more probkems by running too much extraction and fans.
Light is hot bro, learn to read air temps properly and it will by magic become the same as any other light.
Light is hot bro, learn to read air temps properly and it will by magic become the same as any other light.
So what's the problem if the temps are ok? Can this be the brown spots on the leaves?
2Hearts
Well-Known Member
I dont know but the advice on how to set up a thernometer for accurate reading will help not worry about heat.
JoeBlow5823
Well-Known Member
What are you doing for nutrients? They just look slightly hungry. And canopy temp is actually very important but you need to get a laser thermometer to read the exact temps of leaves/buds.
Right now 2ml/L sensi bloom A/B and 1ml/L carboload. Every 3 days 2.5L each. I let them get complete dry
Maybe I have to add more nuts because I have 1500watts
JoeBlow5823
Well-Known Member
I dont know much about liquid nutes but that sounds like a fair amount.... I would just stick to the plan.
JoeBlow5823
Well-Known Member
Yeah fair point.... the more light you have the more nutes they burn through. The second big auto run i did, i gave them to much light.
2Hearts
Well-Known Member
JoeBlow5823
Well-Known Member
Right. But having your thermometer in the light will give you an accurate idea of leaf temps.
JoeBlow5823
Well-Known Member
Air temp yeah.
2Hearts
Well-Known Member
No, a leaf is an efficient cooling system, a thermometer is a lump of plastic, they will atain different temperatures.
Leaf temperature is more complex anyway, we can draw easy conclusions if we were to monitor it but im happy just knowing air temps are in the right range.
Leaf temperature is more complex anyway, we can draw easy conclusions if we were to monitor it but im happy just knowing air temps are in the right range.
2Hearts
Well-Known Member
Original post says 24 max in room.
What is the coldest area in the room?
If you have good extraction and mixing and intake is lower temp then i dont see a problem. If intake is high or bad extraction mixing thern theres the reason its hot in the grow.
Nobody reads air by allowing thermometer to be in the light or have light on it, the canopy is the worst place for a meter and hope you see that when temps get really high under the light.
What is the coldest area in the room?
If you have good extraction and mixing and intake is lower temp then i dont see a problem. If intake is high or bad extraction mixing thern theres the reason its hot in the grow.
Nobody reads air by allowing thermometer to be in the light or have light on it, the canopy is the worst place for a meter and hope you see that when temps get really high under the light.
JoeBlow5823
Well-Known Member
Depends what your leaf temps are.