Yellowing on SOME leaves Nutes or lights or both?

S

SoCal65

Member
Indoors
3 plants, week 6 still on 18-6 using 1000 watt Arknoah led panel (100x10w)
50% cocoa coir, 50% organic soil from big box store, but ingredients have lowest % of nutes I could find.
Each plant is in a 3 gallon bucket
65-70% humidity
avg 72-76ºF

I've been feeding with Foxfarm according to their scheduled mixtures, using big bloom, grow big and tiger bloom, but maybe not enough. I've been mixing into a 1 gal jug, and giving 1/2 gallon split 1/3 between each plant, once a week, and watering twice a week with straight water besides that.

My light is about 16" from plant tops.

All three plants have leaves turning yellow in the middle, with darker green veins. From my research, I'm either deficient on magnesium or iron. HOWEVER, this is only happening in the center of the plants where the one light is concentrated, except for there are a couple of sets of fan leaves at the very bottom that are dying. The first picture is the worst leaves, and those spots aren't on any other leaves yet, just yellowing.

My thoughts are to double the feedings and move the light higher. Does that sound right?
 

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Last edited:
polishpollack

polishpollack

Well-Known Member
Your plants aren't growing upwards much, which might be due to the light being too low, too close to them. You also have brown areas that look like they might be the result of heat damage, also indicating the light is too low.
Are you sure that you should be using all three fert bottles? I would think grow has what you need, at least for veg. I'm not familiar with the FF line of ferts except the trio. The thing to do is research what nutrients are needed by plants and try to give them that without over doing it. If you feed to often, it's similar to giving too much all at once. I think the only difference is plant death takes longer, but the outcome is the same.
 
Jenko

Jenko

Well-Known Member
SoCal65 said:
Indoors
3 plants, week 6 still on 18-6 using 1000 watt Arknoah led panel (100x10w)
50% cocoa coir, 50% organic soil from big box store, but ingredients have lowest % of nutes I could find.
Each plant is in a 3 gallon bucket
65-70% humidity
avg 72-76ºF

I've been feeding with Foxfarm according to their scheduled mixtures, using big bloom, grow big and tiger bloom, but maybe not enough. I've been mixing into a 1 gal jug, and giving 1/2 gallon split 1/3 between each plant, once a week, and watering twice a week with straight water besides that.

My light is about 16" from plant tops.

All three plants have leaves turning yellow in the middle, with darker green veins. From my research, I'm either deficient on magnesium or iron. HOWEVER, this is only happening in the center of the plants where the one light is concentrated, except for there are a couple of sets of fan leaves at the very bottom that are dying. The first picture is the worst leaves, and those spots aren't on any other leaves yet, just yellowing.

My thoughts are to double the feedings and move the light higher. Does that sound right?
[/QUOTE
Click to expand...
Foxfarm not hearing a lot of good about it, wouldn't use it.
 
S

SoCal65

Member
polishpollack said:
Your plants aren't growing upwards much, which might be due to the light being too low, too close to them. You also have brown areas that look like they might be the result of heat damage, also indicating the light is too low.
Are you sure that you should be using all three fert bottles? I would think grow has what you need, at least for veg. I'm not familiar with the FF line of ferts except the trio. The thing to do is research what nutrients are needed by plants and try to give them that without over doing it. If you feed to often, it's similar to giving too much all at once. I think the only difference is plant death takes longer, but the outcome is the same.
Click to expand...
I've done some LST on the stems, which is why they are more spread out than tall, and also topped main stems on day 38.

Below is the chart I've been using for nutes, but just the three I've mentioned.
 

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The Gram Reaper

The Gram Reaper

Well-Known Member
I would say heat pulling the N out of the leaves from light too close/low air flow, as suggested by others.
nl5xsk1 said:
In my opinion,Charts can cause over fertilizing, When I used nuetrients I never went above 50% of what they recommend
Click to expand...
Beautiful plant in your avatar pic. I am finding this also, especially now that I work with smaller plants. Plants are topping out at 5ml/gal at their size and it recommends 8-10. I would have lost plants.
 
nl5xsk1

nl5xsk1

Well-Known Member
The Gram Reaper said:
I would say heat pulling the N out of the leaves from light too close/low air flow, as suggested by others.

Beautiful plant in your avatar pic. I am finding this also, especially now that I work with smaller plants. Plants are topping out at 5ml/gal at their size and it recommends 8-10. I would have lost plants.
Click to expand...
Blueberry Headband, Looks nice but that main cola was solid foxtails, don’t grow in that fashion any longer. I pinch em back to get better yield 1599930445111.jpeg
 
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