A Safe, Versatile Potassium Fertilizer for any Cropping System

Sure-K is a high-efficiency potassium fertilizer giving plants the nutrients they need to thrive at key reproductive stages. The unique formula provides increased utilization at lower concentrations, providing the same or better results than standard potassium fertilizers while using less. In addition, Sure-K uses no chlorides or hydroxides, so it has little risk of harming plant tissue and helps preserve soil health long-term.

After nitrogen, potassium is the second most-used mineral nutrient for permanent plants and trees. Potassium is particularly important to fruiting trees and vines because it plays a key role in the formation of sugars and starches. Potassium is also important in regulating the use of water and carbon dioxide. This means trees and vines with adequate potassium are more resistant to drought and temperature extremes which have been known to ruin harvests. 

The Nutriq Technology in our fertilizer is what promotes better plant growth while actually using a lower concentration of potassium. These plant-based polymers make more potassium available to the plants over a longer time period, allowing plants to continually draw potassium as they bud, bloom, and produce fruit and seeds.

Sure-K makes it easy to sustain ideal potassium levels or correct potassium deficiencies. The flexible application of this liquid potassium fertilizer makes it easy to use across many different orchards and vineyards. It can be used with your existing fertigation equipment, sprayed as a foliar, or applied as a sidedress.   

Product Benefits

  • Improves sugar content of fruit
  • Promotes nutrient movement through the tree or vine
  • Improves water use throughout the tree or vine
  • Plant is more resistant to weather extremes
  • Flexible application via fertigation, foliar, side- or top-dress

Composition Guarantee Analysis

Total Nitrogen 2.00%
0.41% Nitrate Nitrogen
0.59% Ammoniacal Nitrogen
1.00% Urea Nitrogen
Phosphate (P2O5) 1.00%
Soluble Potash (K2O) 6.00%

Sure-K is a clean potassium fertilizer free of chlorides and hydroxides. Sure-K can be safely combined with other nutrient solutions or crop protection products, however, it is recommended to consult with an agronomist before combining solutions.

Sure-K is a clean potassium fertilizer free of chlorides and hydroxides. Sure-K can be safely combined with other nutrient solutions or crop protection products, however, it is recommended to consult with an agronomist before combining solutions.

Have us design a custom nutrition plan for you

An AgroLiquid nutrition plan is dependent on your location, climate, soil conditions, and goals with your crop. All of our tailored programs start with reviewing your soil samples with one of our expert agronomists. After our analysis, our team will provide you with a couple options that will help you meet your goals on a budget that won’t break the bank.

AgroLiquid Scientific Advancements

Not all potassium fertility products work the same. Potassium, like other essential plant nutrients, quickly breaks down and becomes unusable to plants when it combines with ions in the soil. This is why conventional 0-0-60 potash uses such high concentrations, but doesn’t last throughout the crops’ growth and reproductive stages. Through extensive research and testing, we developed soluble potash fertilizer that makes potassium available to plants and doesn’t get trapped in soil. This allows farmers and growers to use less actual potassium, while crops utilize more of it.

Nutriq Technology

This bonds with your nutrients and creates a protective layer that makes up to 80% more of your nutrients available to plants. It sounds like magic, but it’s just science.

Application strategies for Sure-K®

Planter placement

Topdress or sidedress


Broadcast or banded over seed zone

Foliar treatment

Combined with pesticides or fungicides

Have a specific crop problem you’re trying to solve?

AgroLiquid was founded because there wasn’t a nutritional product that was solving our fertilizer needs; after 35 years of development and research, our chemists, biologists, and agronomists continue to innovate and create the best products on the market. If you have a specific crop problem, ask one of our agronomists and we’ll help you solve it!

Sure-K® soluble potash is used regularly with

Pro Germinator

Pro-Germinator provides well-balanced crop nutrition and supports early growth at planting. It provides a range of nutrients without damage to plants. (Sure-K is best used as a soil application when combined with this product)


FertiRain is a complete multi-nutrient liquid fertilizer containing the optimal mix of macronutrients, secondary nutrients, and micronutrients. (Sure-K is best used as a foliar application when combed with this product.)

Micro 500

Micro 500 provides boron, zinc, manganese, iron and copper. This product does not contain sulfur. Speak with an agronomist to find the best micronutrient combination for your crops.

Ready to give AgroLiquid a try?

Our suppliers are experienced crop advisors located throughout the U.S. and Canada.
Each crop advisor knows the soil, climate, market, and most popular crops of the area.