Yellowing from top down

Working with a G cake strain I got from a dispensary so I can't verify their genetics. Growing in GH cocotek, currently using the General Organics go box bundle watering to runoff once per day. Pretty much following the instructions on the box barring a little extra calmag.

In an approximate 2 gallon container that comes out to 4tsp bio grow, 4tsp calmag, 4tsp bio root, 2tsp bio weed and 4tsp bio marine. After pH adjusting to around 6ph it's coming out to about 1300ec. Yellowing was more prominent on the smallest clone but is slowly showing up in the bigger ones as well.

Any input is greatly appreciated!

Maybe over feeding? Have you checked the run off levels?

EDIT :: sorry i'm high, you stated the level in the post -_-.

Thats my only guess tho, hopefully someone else will be along.

1300 does sound pretty high tho!

First organics arnt the best to use in a coco grow.

Medicated Bonsai said:

Maybe over feeding? Have you checked the run off levels?

EDIT :: sorry i'm high, you stated the level in the post -_-.

Thats my only guess tho, hopefully someone else will be along.

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You cant go by tds with organic nutes.

hubba said:

Working with a G cake strain I got from a dispensary so I can't verify their genetics. Growing in GH cocotek, currently using the General Organics go box bundle watering to runoff once per day. Pretty much following the instructions on the box barring a little extra calmag.

In an approximate 2 gallon container that comes out to 4tsp bio grow, 4tsp calmag, 4tsp bio root, 2tsp bio weed and 4tsp bio marine. After pH adjusting to around 6ph it's coming out to about 1300ec. Yellowing was more prominent on the smallest clone but is slowly showing up in the bigger ones as well.

Any input is greatly appreciated!

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I am willing to bet you are using city water from the tap. The chlorine kills the microbes which the plants need to break down organic nutes

Also just noticed to say 1300ec. You probably mean 1300 ppm or 1.3 ec. 1300Ec is like 650000ppm

Lastly your going through a TON of ph up. One of the best things abought organic nutes is they self buffer in soil and the ph testing or adjusting is nessesary. Coco is hydro and must be phed.

Dynamo626 said:

First organics arnt the best to use in a coco grow.

You cant go by tds with organic nutes.


I am willing to bet you are using city water from the tap. The chlorine kills the microbes which the plants need to break down organic nutes

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I am aware Coco is hydro. I originally planned for a soil grow before obtaining the clones but switched to Coco since that's the medium they were rooted in. I just bought the GH flora series and will be switching immediately. I am using tap. Hoping that doesn't have as much of an effect on hydro nutes.

Dynamo626 said:

Also just noticed to say 1300ec. You probably mean 1300 ppm or 1.3 ec. 1300Ec is like 650000ppm

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I am referring to microsiemens per centimeter. Hence it'd be approx 1.3ec.

Dynamo626 said:

Lastly your going through a TON of ph up. One of the best things abought organic nutes is they self buffer in soil and the ph testing or adjusting is nessesary. Coco is hydro and must be phed.

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I am using about 1tsp per gallon to bring it to near 6PH. Is this a bad thing?

hubba said:

I am using about 1tsp per gallon to bring it to near 6PH. Is this a bad thing?

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It isnt bad just expensive. Am i wrong about the tap water? I managed a hydro store for 3 years and 90% of the time a customer was having deficiency problems with General or Roots Organics i found out they are using city tap water. As soon as they changed that or started using Dechlorinater the problem fixed itself.

Iron and sulfur deficiency.

Dynamo626 said:

It isnt bad just expensive. Am i wrong about the tap water? I managed a hydro store for 3 years and 90% of the time a customer was having deficiency problems with General or Roots Organics i found out they are using city tap water. As soon as they changed that or started using Dechlorinater the problem fixed itself.

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Yes i am using tap. Not sure why I forgot to reply to that. So, it sounds like the General Organics depends on microbes to break down the nutes for some of the micronutrients to be available but the chlorine in the tap is killing them off. However the general hydro stuff should have the micronutrients in a ready-to-absorb state so I should be fine using tap with those. Am I getting this correctly?

hubba said:

Yes i am using tap. Not sure why I forgot to reply to that. So, it sounds like the General Organics depends on microbes to break down the nutes for some of the micronutrients to be available but the chlorine in the tap is killing them off. However the general hydro stuff should have the micronutrients in a ready-to-absorb state so I should be fine using tap with those. Am I getting this correctly?

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The amount of chlorine in most tap water will not kill off any microbes in soil! If you start going over 60 ppm's of chlorides, then you may have some issue, but only the top few inches of soil are affected. Tap water usually won't have that much, mine for example has 25 ppm. It's like the myth that chemical fertilizers kill microbes, they don't, not if applied properly!

Do your feed ratios again & make sure P isn't too high. (bio marine in coco is probably not a good idea for vegging plants)

Blitz35 said:

The amount of chlorine in most tap water will not kill off any microbes in soil!

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Agree 100%. Been growing a while. Only when the base EC starts getting over 1.0 will you usually see problems and then it's not chlorine or chloramines but calcium mainly. Also high iron content water can cause issues but virtually any approved water supply is fine for cannabis.

Figured I'd post an update since most threads go unfinished. Since switching to general hydro nutes things seem to be improving. Not sure the exact reason I was experiencing a iron deficiency using general organics but I was definitely doing something wrong.

hubba said:

Figured I'd post an update since most threads go unfinished. Since switching to general hydro nutes things seem to be improving. Not sure the exact reason I was experiencing a iron deficiency using general organics but I was definitely doing something wrong.

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GH is good stuff, simple, complete, fairly cheap and plants love it..!