Potassium content in sand

How much potassium is present in your root zone or topdressing sand? It's not a question that many can answer, but Dr. Doug Soldat of the University of Wisconsin thinks it's an important one. That's because he has been looking at the potassium content of different sands, and discovered that there's a broad range of potassium content. For example, the sand with surprisingly high level of 2.2% potassium in this photo contains K feldspar, which is responsible for the slightly…