Hello Willy and Oxanna,

Thank you for the question.

For lawns that need the application of potassium, it is best to apply half the needed potassium now and half in the fall. https://hles.unl.edu/winterizer-lawn-fertilizer

Your soil test says you need to apply 2.3 pounds of potassium this growing season. That means you need 1.2 pounds of potassium in May, and 1.2 pounds of potassium in the fall. Every 1 pound of the potash fertilizer will deliver 1*0.5 pounds of potassium. That means you will need to spread 2.4 pounds of the fertilizer over 1000 square feet. Potash needs to be watered in after application.

Unfortunately, we cannot tell you a specific number to use on your spreader. The physics of a spreader makes the amount of product delivered quite variable even in two devices from the same company, so calibration of your specific spreader is required. The following article from Penn State is very good at explaining how to calibrate a spreader: https://extension.psu.edu/calibrating-your-fertilizer-spreader

Measure out 2.4 pounds of the fertilizer, mark out 1000 sq feet of lawn and choose a small setting on your spreader. See if you use all the product or not before you cover the 1000 sq feet. Reset the product to 2.4 pounds in the spreader, increase the spreader setting and do another 1000 sq feet. Keep doing this until you are applying 2.4 pounds of product in a 1000 sq foot section. When you reach that application rate, you have the correct setting on your spreader. Use that number setting on the spreader to finish applying fertilizer to your lawn and record it on the fertilizer bag, because you will need it again in the fall.

I hope this helps.