I use the standard Hanna buffers
HI 7007 = pH 7.01
HI 7004 = pH 4.01
What troubles are you having?
Dutch Passion Objective; Medical CBD | Dutch.P. | Ortega Indica | Night Queen | LED&CFL | Airpots | Coco
- Thread starter Groff
- Start date
I use the standard Hanna buffers
HI 7007 = pH 7.01
HI 7004 = pH 4.01
What troubles are you having?
Got the same ones too
God damn it! 
The Purple Haze has started to show the same yellowing too.
The Night Queens are perfect. But 3 of 5 plants are yellowing. They're too little a plant to be exhibiting a deficiency, it looks like iron deficiency, but from my reading it could also be from the medium being too wet, which I suspected yesterday. Sooo... no watering at all today and possibly tomorrow, reduced the extraction to increase tent heat to around 25/26ºC to promote evap.
I know its nothing too dramatic, but yeah I am being triple cautious.
They don't seem to be growing in height, which also suggests excess water. The leafs certainly are developing, Night Queens are starting their 3rd set of true leafs, the others still on the second.
Coco really does behave quite differently that soil/soiless. When they say you have to water a lot less, they were NOT joking! (at least, I hope this is the case)
The Purple Haze has started to show the same yellowing too.
The Night Queens are perfect. But 3 of 5 plants are yellowing. They're too little a plant to be exhibiting a deficiency, it looks like iron deficiency, but from my reading it could also be from the medium being too wet, which I suspected yesterday. Sooo... no watering at all today and possibly tomorrow, reduced the extraction to increase tent heat to around 25/26ºC to promote evap.
I know its nothing too dramatic, but yeah I am being triple cautious.
They don't seem to be growing in height, which also suggests excess water. The leafs certainly are developing, Night Queens are starting their 3rd set of true leafs, the others still on the second.
Coco really does behave quite differently that soil/soiless. When they say you have to water a lot less, they were NOT joking! (at least, I hope this is the case)
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Maybe you should talk to OhJay....
Will do, thanks!
A soon as I put the meter in 4.01 buffer solution WRNG appear on the screen and it remain so. When I press on O
I see OK1. I want to have OK2. I will try some other PH buffer manufacturer.A soon as I put the meter in 4.01 buffer solution WRNG appear on the screen and it remain so. When I press on O
Are you sure the buffers did not get cross contaminated? Usually 4.01 will be out due to "buffering malpractice". Don't think is a brand problem, but who knows...
The Adwa meters have an option of 1 and/or 2 point calibration points, in which the second can be 4.01 or 10.01 (auto detected). But it has a second buffer set of 4.01/6.86/9.18.
Check if this last on is not set to default. Buffer 7.01 to 6.86 is not that far off and could trick the calibration and skew the curve to not accept 4.01. But my guess would first be buffer contam. Oh, by the way, is it new? Or have you been using it ok for some time now?
In any case, with the single 7.01 cal you should be in the ballpark between 5.5 and 6.5. Further from that is not to be trusted for measuring, but will be a clear indication nonetheless.
Also, have a cup of plan water handy. Rinse the probe and wipe the exterior. Calibrate 7.01. rinse, shake a little to clear the probe heads, and wipe the outside. Don't ever dip straight into the 4.01 of the buffers will contaminate!! (If you've ever done this, buy a new little 4.01 buffer sachet!!)
Put in 4.01 to calibrate. The thing is you have 12 seconds between buffers or it will error out. So once you OK 1 on 7.01, rinse, shake, wipe and dip!
Shake the probe inside the buffer solution a bit, a quick jiggle, so that no air bubbles/left overs swings the pH.
Also, leave a few drops of pH 7.01 in the cap of the pH meter. When storing, rinse, shake, wipe and cap it. This will ensure a longer lasting precision.
Also, I think Robwars should write a song called "Rise, Shake, Wipe and BOM!" as the soundtrack for his next featured presentation
hope it helps :thumbs:
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O
Oh Jay
Guest
Hiya bud,
I can't really tell from the pics, but maybe it's overfeeding.
My usual regime is 0.8 to 1.0 grow with a pH of 5.8 -6.2 from seedling. Then I increase the feed until the tips yellow a little, then back off a bit until the leaves go dark green.
Some plants like a lower pH than others, so experiment with tiny changes, and water each plant individually.
It's a right pain sometimes but it can be worth it until the plants are older and can cope.
Hope that's useful,
OJ
I can't really tell from the pics, but maybe it's overfeeding.
My usual regime is 0.8 to 1.0 grow with a pH of 5.8 -6.2 from seedling. Then I increase the feed until the tips yellow a little, then back off a bit until the leaves go dark green.
Some plants like a lower pH than others, so experiment with tiny changes, and water each plant individually.
It's a right pain sometimes but it can be worth it until the plants are older and can cope.
Hope that's useful,
OJ
Thanks for the advise Groffuwiwi, It (PH 4.01) maybe got contaminated or it could be old solution. Thus the temparature matters when calibrating? It just bought it new a couple off weeks ago. My EC meter (AD32) works fine. Before I start to calibrate it I put it in different solution and got wrong readings. Vinegar can never be ph6 so I know something was wrong. If another PH buffer solution don't work I will try another replaceable electrode. Thanks for the reply and explanation. :thumbs:
Yes, it matters a lot, but these meters auto-compensate for temperature. Buy a cheap little bag of new buffer and check
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