The Proof is in the Potatoes

Field Trial Emphasizes Benefits of SOP vs. MOP

There’s no question, potassium is vital to potato health and performance. But not all K sources are created equal. A Umatilla Russet potato field trial – near Othello, Washington – compared a sulfate of potash (SOP) K fertilizer [with less than one percent chloride] against muriate of potash (MOP) [containing 47 percent chloride]. The study, led by Steve Holland, a research and agronomic consultant with Holland Agricultural Services, evaluated potato yields and crop quality. 

Trial details 

Small plot research was conducted in a commercial potato field on the variety Umatilla Russet. Five K treatments were applied: 1) Protassium+® premium sulfate of potash, SOP (0-0-50-17S), 2) MOP (0-0-60), 3) MOP plus sulfur, 4) Protassium+ SOP/MOP blend and 5) an untreated control. The study was replicated 4 times.

Potash + Potatoes = Performance + Profits

The Protassium+ SOP plots outperformed all the other treatments. Not only did the SOP-treated potatoes produce five tons more than the MOP-fertilized potatoes but they yielded at least three tons of U.S. No. 1s more than the rest, too.

Protassium+ is the right K source

Protassium+ SOP fertilizer has the lowest salt index per unit of K20 among all major sources of potassium. With 17 percent sulfur in sulfate form and 50 percent K2O that are readily available for uptake, Protassium+ premium sulfate of potash delivers the vital K that potatoes need to grow to their full potential.

To learn more about Protassium+ premium sulfate of potash and how it can maximize potato yields, call 1-800-743-7258.