Yellowing between veins and on edges of top leaves

F

Forage

Well-Known Member
20210625_193147.jpg

Some of my upper fan leaves are getting this. Coco, almost 40 days since the flip to 12/12. Feed every watering, 20% runoff.

At the flip I was (from the labels):

N-150
P2O5-50
K2O-100
C-120(high, kind of hard to fix with what I have on hand, for now)
Mg-20(Low, because I had a bad info on Mg% in epsom salts. I'm putting 2 grams per 10 liters of feed).

I've increased all levels by a third over the last 5 weeks, runoff is consistently 0.2EC below water in.

pH is about 6 in, 6 out. I'm using drops and my water isn't totally clear so the reading can be murky but it seems normal.
 
Last edited:
Tracker

Tracker

Well-Known Member
Forage said:
View attachment 4931229

Some of my upper fan leaves are getting this. Coco, almost 40 days since the flip to 12/12. Feed every watering, 20% runoff.

At the flip I was (from the labels):

N-150
P2O5-50
K2O-100
C-120(high, kind of hard to fix with what I have on hand, for now)
Mg-20(Low, because I had a bad info on Mg% in epsom salts. I'm putting 2 grams per 10 liters of feed).

I've increased all levels by a third over the last 5 weeks, runoff is consistently 0.2EC below water in.

pH is about 6 in, 6 out. I'm using drops and my water isn't totally clear so the reading can be murky but it seems normal.
Click to expand...
What are your temps and humidity?
 
F

Forage

Well-Known Member
Humidity has been around 50-60%.

Heat just spiked so we're 24-29C/75-84F but until a few days ago more like 20-25c/68-77F.

Both of my indicas have this, one has for weeks, the other one just started showing it.
 
F

Forage

Well-Known Member
Leeski said:
What size pot ? Looks tiny from pics
Click to expand...
The pots are 15 liter. There's about 7.5kg/16lb of coco in each pot when fully saturated.

I would say that you're right, and the pots are a bit undersized. I flipped late and they got bigger than planned, and I didn't have enough coco to fill the pots all the way in the first place. But they might look smaller because the height of the plants makes the pot further away from the camera.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Forage said:
View attachment 4931229

Some of my upper fan leaves are getting this. Coco, almost 40 days since the flip to 12/12. Feed every watering, 20% runoff.

At the flip I was (from the labels):

N-150
P2O5-50
K2O-100
C-120(high, kind of hard to fix with what I have on hand, for now)
Mg-20(Low, because I had a bad info on Mg% in epsom salts. I'm putting 2 grams per 10 liters of feed).

I've increased all levels by a third over the last 5 weeks, runoff is consistently 0.2EC below water in.

pH is about 6 in, 6 out. I'm using drops and my water isn't totally clear so the reading can be murky but it seems normal.
Click to expand...
Interveinal chlorosis is classic Mg deficiency and you're right about the time it would show too. You need more Mg. Those leaves won't get better but things will stop getting worse. Best of luck.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Forage said:
The pots are 15 liter. There's about 7.5kg/16lb of coco in each pot when fully saturated.

I would say that you're right, and the pots are a bit undersized. I flipped late and they got bigger than planned, and I didn't have enough coco to fill the pots all the way in the first place. But they might look smaller because the height of the plants makes the pot further away from the camera.
Click to expand...
You're in hydro. I finish in 2 gallon pots and have finished healthy 6 ft plants. The size of your pot just affects how quickly your pots dry out and how often you need to feed/water up to a point. I haven't reached that point myself though.
 
F

Forage

Well-Known Member
curious2garden said:
Interveinal chlorosis is classic Mg deficiency and you're right about the time it would show too. You need more Mg. Those leaves won't get better but things will stop getting worse. Best of luck.
Click to expand...
Thanks for that. I'll bump up the epsom salts a bit and see how things go.

I thought I had noticed a bump to my yield when I switched to bigger pots, but there's too much variability to my grows to draw any real conclusions.
 
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