February 2017

Aspire® Alfalfa Yield Trials


Evaluate the yield response to Aspire® (0-0-58-0.5B) compared to MOP (0-0-60).


  • MOP is commonly used as a potassium (K) source in alfalfa production. 

  • In addition to K, alfalfa removes approximately 1.5 oz boron (B) per ton of dry matter.

  • Granular B products can be blended with K, but application of these blends often leads to undesirable distribution.

  • Aspire® is the first-of-its-kind micronutrientenhanced potash fertilizer. Formed using innovative Nutriform® technology, Aspire® premium potash combines potassium and boron in each granule to help achieve balanced crop nutrition.


Locations and Crop Management:

Crop: Alfalfa (Medicago sativa)

Year: 2013-106

Location: 20 trials United States – CA, ID, IL, MN, NY,OH, SD, WI

Data Source: Field studies conducted by third-party, independent researchers.

Experimental Design: Small-plot RCBD with 4 replications.

Cropping Conditions: Trials conformed to local cropping practices and were conducted on an established stand.

P Rate: As required by soil test.

K Rate: 180 lbs K₂O/ac

B Rate: 1.55 lbs B/ac

Application Timing: Directly following first cutting

Application Method: Broadcast


MOP_Aspire Yield
aspire alfalfa yield trials graph


  • Across 20 trials, Aspire® outyielded MOP by 0.5 tons/ac.

  • By combining K and B in one granule, Aspire® reduces the risk of uneven application and improves nutrient use for maximum yields.

©2020 The Mosaic Company. All rights reserved. AgriFacts, MicroEssentials, SZ, Fusion, Aspire and NutriForm are registered trademarks of The Mosaic Company.

Individual results may vary, and performance may vary from location to location and from year to year. This result may not be an indicator of results you may obtain as local growing, soil and weather conditions may vary. Growers should evaluate data from multiple locations and years whenever possible.

WARNING: Contains boron. Use of boron may result in crop injury. DO NOT place this product in direct contact with the seed.