I thought it was the Potentcy highWhat is pH?
pH is one of the most common analyses in soil and water testing. An indication of the sample’s acidity, pH is actually a measurement of the activity of hydrogen ions in the sample.
pH measurements run on a scale from 0-14, with 7.0 considered neutral. Those solutions with a pH below 7.0 are considered acids, and those above 7.0 are designated bases. The pH scale is logarithmic, so a one unit change in pH actually reflects a ten-fold change in the acidity. For instance, orange juice (pH 4) is ten times more acidic than cottage cheese, which has a pH of 5.
Many industries rely heavily on pH for their processes to work properly, or to maintain expensive equipment. Breweries maintain the pH between 4.2 and 4.6 to keep infectious bacteria from breeding during the fermentation process. In many industrial applications, if the pH is too low the water may corrode metal equipment, but if it is too high scaling may result.
pH can be measured visually or electronically. Visual comparisons use a pH indicator whose color change reflects the pH, which is then matched to a color
standard. pH meters, such as the pH 5, simplify the pH test. A probe is placed in
the sample, and the pH is read directly from the meter.
While the meter is very easy to use, the electronics within the meter are more
complex. After the pH probe measures the millivolts of potential between the
reference electrode and the pH electrode, the meter converts this reading to pH
units using the Nernst Equation:
where Ex = constant depending upon reference electrode
Tk = absolute temperature
n = charge of the ion (including sign)
F = constant
ai = activity of the ion
Because your pH electrode is susceptible to dirt and contamination, clean it
every one to three months depending on extent and condition of use.
Clean the electrode in a mild detergent solution. Wipe the probe with a soft
tissue paper. Avoid touching the glass membrane with your fingers. Rinse
thoroughly in tap water and then in distilled water. Recalibrate your meter after
cleaning the electrode.
The pH electrode should always be stored in the soaker bottle. The cap should
be tightened to prevent leaks. The soaker bottle contains a dilute solution of
Special Cleaning Tips
Salt deposit: dissolve the deposit by immersing the electrode in tap water for ten
to fifteen minutes. Then thoroughly rinse with distilled water.
Oil/grease film: wash electrode pH bulb gently in detergent solution. Rinse
electrode tip with distilled water.
Clogged reference junction: heat a diluted KC1 solution to 60-80°C. Place the
sensing part of the electrode into the heated solution for about 10 minutes.
Allow the electrode to cool in some unheated KC1 solution.
Protein deposits: prepare a 1% pepsin solution in 0.1M of HC1. Place the
electrode in the solution for five to ten minutes. Rinse the electrode with
When you fed her what was the PH of the water with Nutes?One of my plants, Stacy, has some yellow leaves. I thought it was a magnesium deficiency and gave her CalMag. This hasn't helped as she's growing more yellow every day. And she's a few weeks away from harvesting.
This morning I checked her pH with one of those soil probes. Her pH is close to eight. I have no idea how this happened as she gets the same feeding as her sister plant (which is doing fine).
What's the best way to bring the pH down? I thought of watering her with some acidic water. The thing is, I flushed and fed her yesterday. Her soil is saturated with water; I don't want to wait a week for her soil to dry.
And help would be appreciated.
Just water with the right solution and the right PH and instead add 20% watering to it it will eventually adjust without causing ireversible damage.. do a complete saturation with little extra and wait a little longer before watering and feeding again.I couldn't find the test kit so I just fed her the scheduled nutes.
I'm thinking of adding a little acid solution to the soil every day until the matter is resolved.
There are very acurate ph reading brobes iut there. They cost 300-400 dollars. And si i'm an actual horticolturist. I can tell you that its possible to do soil testing with a normal ph pen. You need iy to be calibrated need to take sample at a few places in the pot and mix it in distiled 7.0 distilled wated to a certain part and mesur the diference in the water tested after iy has been siting and you'll know the soil ph.Soil PH Meter? As in those cheap probes that tell you when to water etc...? Can't get a correct reading with those, and if we talking actual soil and not a hydro like medium like coco then it has things built into it that buffers the PH and no reason to even try to measure the PH of it. Worry about the PH of water/nutrients going in being in the proper range for your medium (or your nutrients as some call for a slightly different PH according to manufacturer) , as chasing problems that are not there will create actual problems, unless your plants are showing signs of deficiencies/lockout.