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Additional Testing

Biostimulant, Biofertilizer, and Soil Amendment Evaluation

Colorado State University delivers results that you and your customers can trust.  We test biological technologies–whether delivered as a seed coating, powder, liquid, or soil amendment– on corn, grain sorghum, and sunflowers under both dryland and irrigated management.

Our multiple trial sites throughout Colorado enable consistent testing under a wide range of soils and climates. Colorado’s semi-arid environment is ideal for testing products intended to relieve drought stress and enhance climate resiliency.

How we work

Our precision plot planter is equipped to test up to ten different liquid products or rates in a single trial with in-furrow planting applications.

All of our trials are planted with a precision small-plot vacuum planter equipped with Monosem seed meters (to allow for seed singulation) in 4-row plots that are 30 feet in length.  Treatments are replicated at least three times at each site.

We offer the following options to measure crop performance during the growing season:

  • grain yield
  • grain test weight
  • grain protein
  • early season plant vigor
  • emerged plant population
  • plant height
  • plant lodging (if applicable)
  • days to mid-bloom (select locations)

Soil samples measuring organic matter, pH, N, P, K, and micronutrients are also taken prior to planting down to a depth of two feet. Additional soil health analyses can be provided through our state-of-the-art Soil, Water, Plant Testing Laboratory and through collaborations with CSU faculty.

A trial inquiry form is now available with a deadline of April 4 for 2022 summer trials. Space is limited and allocated on a first-come first-serve basis. For questions or more information, please contact Sally Jones-Diamond at or at 970-214-4611.

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