Whats going on here?

[Frank Reynolds]

I can get an exact quote for you later at work atm, it is to do with coco's ability to hold onto certain actions versus others, as it is not an inert media it will also 'give off ' causing the ph to differ

[See]

If you are mean that coco is organic and breaks down releasing certain nutes and lacking others, I am onto that. Coco breaking down would also raise the ec within it.

[Frank Reynolds]

No I don't mean nitrogen draw down!

[See]

cation exchange ?

Edited November 27, 2013 by See

[Frank Reynolds]

Its called preferential retention of cations Edited November 27, 2013 by Frank Reynolds

[See]

Knowing about nitrogen draw down and cation exchange, within my capacity to do so , I stiil use runoff PH as a close enough indicator of the coco PH.

If the runoff is 6.2 then I can be fairly certain that the PH of the coco is not 5.8 and adjust my next feed to compensate.

It has kept my plants happy

[Frank Reynolds]

Imo just a waste testing waste for ph, I have never found a need to adjust ph up and down to compensate, whack it at 6 ph the coco will do the rest

[See]

Whatever we are doing it must be keeping the PH within the acceptable range. It works! 

[Frank Reynolds]

Coco has a great buffer capacity!

[jez1]

The runoff is at 6.2 already - whether that makes a difference or not. I understand you saying its not accurate, but I have no other way of getting a rough idea, besides i'm not exactly an 'accurate' grower 

 

I have been feeding at 5.8 - which seems to be the norm.

 

The white rhino and power plant look normal so I can't be too far out. I really think the pineapple chunk is just an abnormal plant. Don't know if that will be a good thing come flower time though, I'll probably just do the other ones.

 

little snap of all 3 (rhino was put in water 1 day after the other 2)

 

 

(P chunk is bottom left, top is rhino, bottom right is power plant)