The Importance of K

Potassium plays a critical role in sweet potato production. But the source of potassium you use also impacts yield and quality of your crop. Protassium+® premium sulfate of potash (SOP) supplies the potassium your plants need, while providing benefits other sources can not match.

The Role of K

Potassium and Sweet Potatoes

For a sweet potato plant to thrive, one of the key nutrients it needs is potassium (K). Potassium impacts the plant's ability to efficiently use nitrogen and aids water uptake. K is also essential for:

  • Improving nutrient value
  • Enhancing taste, color and texture
  • Promoting disease resistance
  • Optimizing yield and grade

Readily Available

The Difference of Sulfate Sulfur

Protassium+ SOP offers 17% sulfur in the sulfate form. This means it is readily available to for uptake, unlike elemental sulfur, which requires significant time, correct temperature and moisture to be converted to a form that plants may absorb. Sulfate sulfur additionally benefits sweet potatoes by:

  • Aiding photosynthesis
  • Enhancing chlorophyll, protein and amino acid production
  • Promoting growth for stronger yields

Sweet potato plants remove 1 lb. of K2O per cut of yield. A 200 cwt of yield will remove 200 lbs. of K2O per acre.

Less Worry

Low Chloride

Excess chloride can pose a threat to yield and quality in sweet potatoes. Protassium+ fertilizer contains less than 1% chloride, compared to muriate of potash (KCl) which contains 47%. Protassium+ SOP delivers more flexibility for application at any time because there is no worry about chloride or salt toxicity.

Potassium Proof

Sweet Potatoes and Protassium+ SOP

A 2007 sweet potato study that compared potassium sources showed that Protassium+ sulfate of potash increased yields and number of marketable U.S. #1 sweet potatoes more as compared to MOP.1


Sweet Potato Potassium Fertilizer Source Test, Louisiana State University Agricultural Center, Sweet Potato Research Station, Chase, LA: 2007