Yellowish spots on leaves

hotrodharley

Well-Known Member
Just gotta say this is my first time. My babies have started showing some yellowish spots on leaves. They are now 4 weeks old (from seed) and were last fed few days ago at EC 0.9 and PH 5.7. Any ideas? If you need more questions to determine the cause, please ask.
Agree with Bob about more info but your EC is awfully high for a young bunch. 4 weeks?
 
Medium
Ph
Nutes
Watering schedule

Etc etc etc
hydrococo 60/40 gold label
I haven't tested the ph of the medium, any good method of doing it? I have the ph pen to measure the solutions for feeds.
I'm using Dutch Pro A + B
They were watered 3 times so far (every week) as the medium seems to retain moisture pretty well and I had them in large pots since the start.
Temp is 24-25 C during light and 16-17 during night. 20/4 schedule.
Lamp height 40cm, Power plant MH 1000w
humidity 40-65

Can I just pour some water into a glass, measure ph, then add a bit of medium, stir and measure ph? Will this give me a correct reading?
 

myke

Well-Known Member
Read up on coco,theres a dozen a week here making the same mistake.Feed to runoff,measure runoff should be same as going in.Plant like yours will get feed every 2 days never straight water.Allways to runoff,its hydro not dirt.
 
Read up on coco,theres a dozen a week here making the same mistake.Feed to runoff,measure runoff should be same as going in.Plant like yours will get feed every 2 days never straight water.Allways to runoff,its hydro not dirt.
Thanks for the reply. What do you mean by "never straight water"?
 

myke

Well-Known Member
Thanks for the reply. What do you mean by "never straight water"?
Never feed straight water. The idea of coco is to water often this pushes out yesterday’s food and gives it new food. We call it drain to waste it’s a type of hydroponics. The plant never has old food it’s always replaced with new food every day. My coco plants get fed twice a day.
you can feed your plant get at least 20 % runoff. Collect this and check it ph and ppms. I’ll bet your ppm or EC will be very high. This is why they look like this.
 
Yup

Typical new coco grower not researching it


Sad....sad indeed
It's tough to find the right info as I've come across people saying to collect run off and adjust feed accordingly and others saying not to bother as it will stabilise itself. Therefore I've decided to go with the latter option and consult you to see if that is the problem. I've also seen soil ph meters where you stick the probe into the medium and measure the ph and moisture levels but those are expensive. So do I just measure the run off and adjust the ph with my next feed?
 

myke

Well-Known Member
It's tough to find the right info as I've come across people saying to collect run off and adjust feed accordingly and others saying not to bother as it will stabilise itself. Therefore I've decided to go with the latter option and consult you to see if that is the problem. I've also seen soil ph meters where you stick the probe into the medium and measure the ph and moisture levels but those are expensive. So do I just measure the run off and adjust the ph with my next feed?
Remember its NOT soil,so anything to do with it dont look at it lol.Do your research,its hydro.
Did you feed your plant to runoff?Collect it and stick your pens in and report back.Then we can help.
 

BobThe420Builder

Well-Known Member
It's tough to find the right info as I've come across people saying to collect run off and adjust feed accordingly and others saying not to bother as it will stabilise itself. Therefore I've decided to go with the latter option and consult you to see if that is the problem. I've also seen soil ph meters where you stick the probe into the medium and measure the ph and moisture levels but those are expensive. So do I just measure the run off and adjust the ph with my next feed?
Runoff means nothing

Water/feed coco daily till 10% run off, with 1/4 strength nutes
Feed ph at 5.6-6.0

Never let it dry out,. Never feed plain water
 
Remember its NOT soil,so anything to do with it dont look at it lol.Do your research,its hydro.
Did you feed your plant to runoff?Collect it and stick your pens in and report back.Then we can help.
I know it's not soil. I always watered them till runoff, I'll measure the runoff today and report back.
 
Runoff means nothing

Water/feed coco daily till 10% run off, with 1/4 strength nutes
Feed ph at 5.6-6.0

Never let it dry out,. Never feed plain water
I cannot water them daily, at least till runoff as the pots are too big to dry enough over a single day and watering them daily would cause overwatering.
 
Another problem is your probably in too big of pot,coco can grow trees in 2 gallon pots.How big is your pot?
I'm aware of pots being too big, 15l so about 3.3 gallons. I cannot do anything about it now. This is my first time and the only way I'm going to learn anything is by trial and error. I've done a lot of research before starting but it's really confusing as there are so many sources and most of them state different things.
 

BobThe420Builder

Well-Known Member
I cannot water them daily, at least till runoff as the pots are too big to dry enough over a single day and watering them daily would cause overwatering.
Please

Read up on how to water/feed in Coco

Medium is supposed to stay wet, it's hydro not soil, you CANT over water

Listen to what people tell you or you will never learn how to grow
 

myke

Well-Known Member
Well give it time,3 gallon isnt huge. .5 ec and some calmag youll be feeding everyday soon enough.
 
Top