identify problem

[fusa91]

What Strain is it? White widow
How Many Plants? 6
Is it in Vegetative or Flowering Stage? Vegatative
If in Vegetative Stage... How Long? 2-3 Weeks Old
Indoor

Size (Wattage) of Light? How Many? 1 sunmaster dual(400 Watts )
Is it Air Cooled? Fan Blowing Over Plants
Temperature of Room/Cabinet? 75-90 F
RH of Room/Cabinet? 30-45 %
PH of Medium or Reservoir? 5.60-7
Any Pests? No
How Often are you Watering? Every 2-3 days (no feeding)
Type and Strength of Fertilizers used? none

I think the plants were exposed to heat in the first 2 weeks light was 15" close and the soil got hot and dry really fast.

 

[fusa91]

the yellow ones are the same "age" as the big one they have stopped growing

pls help

 

[MaryJWanna]

Do you rotate the pants around? Maybe the biggest one is getting most of the light? (assuming you are doing everything the same for all of them)

 

[fusa91]

they are in the middle of the grow room same amount of light for all, yes i am doing everything the same.

 

[fusa91]

there are 2 green ones who are 1 week younger (photo 4 and 5) the rest 3 weeks old

 

[MaryJWanna]

What kind of soil? They look very wet. are they getting good drainage? Do you have plastic dome over them?

 

[fusa91]

wattered them 20 hours ago
soil: potting soil + coco + perlite
no plastic dome
the pot has 5-6 holse in them

 

[MaryJWanna]

If the over heating was from the lights, raise them up higher. Sprouts can handle or need intense light until they are bigger. What kind of water? What is the pH?

 

[fusa91]

i have raised the light from 15" to about 40"
tap water with lime ph 6

 

[Teldren]

How often do you water? I use a couple drops of superthrive in the water on smaller plants once I move them into pot. They look to wet to me. You should try to only water around edges of the pot to promote root growth to search for the water.

 

[fusa91]

2-3 days in between wattering i dont have superthrive. i dont think i can get it here in spain

yup.. that's what i'm doing around the edges..

 

[fusa91]

Nutrients to be used:

the soil :

 

[fusa91]

so what can the cause of the yellow plants be?

 

[David Bowman]

The first picture shows a fertilizer with significantly less N than either P or K which is fine for the flowering stage. For the vegging stage, there should be more N than either P or K. I would find/buy a fertilizer with a better ration of N to P or K, say 20-5-10 or something similar. Wait until the pots dry out and then water them using the new fertilizer and see how the plants respond.

 

[fusa91]

ok, will do .
thanks for the moment.

 

[KingJohnC]

Place your hand underneath your light reflector and move your hand to the point you can not feel any heat and move it above your canopy to that level, raise the light as your plants grow.

here are some lumen versus distance charts, they do not take heat into account

You want pH 5.8 for hydroponic and soiless (peat moss and coco coir) and pH 6.5 for soil.

Here is a nutrient availability chart

Here is a cannabis leaf deficiency chart

here is the Cannabis Plant and Pest Problem Solver and the Plant Abuse Chart

Cannabis Plant and Pest Problem Solver - Pictorial

Plant Abuse Chart