"Runoff pH is useless" or "Keep an open mind"?

simpleleaf said:

Electrical Conductivity: How to Convert mS/cm to uS/cm

The SI measurement unit for electrical conductivity is called Siemens(S). Typically conductivity measurements are displayed in either MilliSiemens per centimetre (mS/cm) or MicroSiemens per cm (μS/cm). It is critical to know how to convert measurements from mS/cm to uS/cm (and vice versa) to...

www.instrumentchoice.com.au

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That conversion is for when you’re dealing with micro salinity levels which are not relevant in nutrient strength That we use. Lol.

that’s for laboratory testing of salinity etc again not what we use in horticulture lol.

Just wait until you realise that nutrient temperature can play a role in EC/PPM values too it will blow your mind lmao.

MickFoster said:

You guys make this way too complicated.

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That's an understatement.

jondamon said:

God knows within the EU more often than not people are using EC as it’s more universally accepted as a nutrient strength measurement and there is no confusion with calibration (unless your name is @simpleleaf lol)

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I took the time to goog it.
From the Canna UK site...

"EC units
Electrical conductivity can be expressed using a number of different units, but the typical unit is siemens per meter2 per mole (S/m2/mole) or millisiemens per centimetre (mS/cm). The mS/cm unit is generally used in Europe as a guide to the concentration of nutrients in water. In North America, conductivity is converted into a count of the ions in the water using parts per million."

jondamon said:

EC is always measures in mS/cm

so your question about mS/cm or S/cm is invalidated.

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No EC can be measured in mS/cm or µS/cm.

"
In addition to collecting a soil sample to test, growers can collect leachate from container grown plants using the Pour Thru method. One of the major advantages to leachate pour thru is that there is no media sampling or preparation. Unlike SME and 1:2 methods, plants do not have to be sacrificed or disturbed for testing because the extract is the leachate collected from the container during routine irrigation. The leachate can be analyzed on-site using the pH and EC pens or it can be sent to a commercial laboratory for a complete nutrient analysis. In the reference section there is a fact sheet from North Carolina State University which provides detailed information on the leachate pour thru method or see: http://www.ces.ncsu.edu/depts/hort/floriculture/Florex/PourThru Handout 123s.pdf
Leachate pour thru is best used for continuous monitoring and graphical tracking of pH and soluble salts. To make this method work best an irrigation and leachate protocol must be established and carefully followed when sampling takes place. Leachate pour thru is not a good choice for casual checks (use 1:2 method for this). Unfortunately, with casual use, the "numbers" are often quite variable, inconclusive, and probably unreliable. "

Im having problems on my big plant, all the leaves on the one side of the plantare turning yellow. I have no idea why. I have been putting in proper PH with my feeds every single time. Idk what to do. I know people say the runoff ph doesnt matter bc its always inaccurate but all my other plants runoff water is under 7 and the plant with the problems is at 7.8. Leaves are rapidly turning yellow. I ended up giving the plant a flush. I know thats not recommended and often doesnt help but i did it at last resort. I will start back with water for a few days before switching back to nutrients.

SkEE87 said:

Im having problems on my big plant, all the leaves on the one side of the plantare turning yellow. I have no idea why. I have been putting in proper PH with my feeds every single time. Idk what to do. I know people say the runoff ph doesnt matter bc its always inaccurate but all my other plants runoff water is under 7 and the plant with the problems is at 7.8. Leaves are rapidly turning yellow. I ended up giving the plant a flush. I know thats not recommended and often doesnt help but i did it at last resort. I will start back with water for a few days before switching back to nutrients.

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You should start your own thread and provide more information if your are looking for help.