A garden’s need for potassium is not so simple to describe. It seems that clay soils “fix” or hold onto potassium, whereas, sandy soils tend to experience severe leaching of their potassium levels. So, the type of soil you have greatly affects the levels you may have. It is important for all kinds of reasons including larger fruit, strong stalks, disease resistance, less wilting and much more.
The potassium soil test is a little more complicated to run. It starts the same with some measured extracting solution in the test tube. Shaken not stirred, then soil settled. Use of an eyedropper to put liquid into a second test tube for the “before” color on the card. Next we count how many drops it takes of the other solution to match the “after” color on the chart. It says to add two drops at a time, then shake and see if it matches but we actually started with eight because our
Out of 10 areas of soil tested all had over 10 drops to even come close to match. For instance, 12 drops equals a “medium-high level” of potassium and we had two of those. 14 drops equals a “medium level” which we had 4 of. A couple 15 drop guys, which are “medium-low” potassium levels and a couple 188 drop results showing “low”.