If we're talking PPM of P and K, we're talking elemental, right?

I'm reading some articles and posts where people are talking about PPM of P and (less importantly) K.

Can I usually assume that if someone is talking PPM of specific elements (as opposed to ppm on a TDS meter) that they're talking about elemental P/K instead of P2O5/K2O?

We should hope any proposed values are knowns within an unused solition

Forage said:

I'm reading some articles and posts where people are talking about PPM of P and (less importantly) K.

Can I usually assume that if someone is talking PPM of specific elements (as opposed to ppm on a TDS meter) that they're talking about elemental P/K instead of P2O5/K2O?

Click to expand...

I'm not sure i understand your question but the conversation is 50ppm = 0.1ec

Star Dog said:

I'm not sure i understand your question but the conversation is 50ppm = 0.1ec

Click to expand...

The percent N-P-K listed on the bottle is really the percent of N-P2O5-K2O (so far as I know, I think UK and Australia have slightly different labelling conventions). So when I read comments referring to "PPM of P (or K)", I'm often unsure of what P or what K they're talking about. If people are working from water reports or software, I assume elemental. But if you're doing match from bottle labels I assume you wouldn't bother converting.