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⚠️ Information and Updates Regarding COVID-19's Impact on the College of Agricultural Sciences

Colorado State University Extension logo on left side with Crops Testing Logo on right side

Welcome to the Official Colorado Variety Testing Program!

Crop Variety Performance Trials are conducted by Colorado State University’s Crops Testing Program to provide unbiased and reliable information to Colorado crop producers to help them make better variety decisions. Each crop in our program has a page where the most recent trial information can be found. Technical reports are available for each crop page. Use the navigation menu above to reach all information about a specific crop.

We're hiring!

CSU’s Crops Testing Program in the Department of Soil & Crop Sciences seeks a full-time Research Associate in Akron, CO to assist with crop field trial research. Read full job description and apply online by 12/5/21 at:

CSU is an EO/EA/AA employer and conducts background checks on all final candidates.

2021 Corn Trial Results

Recent Crop Publications

Current Research

In addition to our crop variety performance trials, the Crops Testing Program conducts relevant and cooperative research on common crops grown in eastern Colorado. This research is done with funding from crop commodity groups, private seed companies, and other grants.

We have a PhD graduate student, Roger Tyler, whose primary research objective is to understand how modern winter wheat varieties grown in Colorado respond to specific environmental conditions which impact quality and yield. To accomplish this he has designed, built and installed weather stations at all of our dryland wheat variety trial locations to collect environmental data at the field. The data is uploaded to the cloud where it can be accessed to see real-time weather conditions at most of our trial locations. Using weather, soil, and fertility data together with yield and quality data we hope to develop another tool to make more specific variety recommendations for dryland wheat farmers in Colorado.

We also have a Master’s graduate student, Danica Kluth, working on soil fertility (nitrogen and sulfur) in dryland winter wheat on three different varieties across ten locations in eastern Colorado (grant funded).

Our Team

Sally Jones-Diamond

Sally is Director of the Crops Testing Program in the Dept. of Soil and Crop Sciences.  She first joined the program in 2010 as a graduate research assistant, and then as a Research Agronomist after finishing graduate school in 2012.  She handles variety trial entries and works with fellow researchers, seed company representatives, and commodity groups.  She also sets up trials, helps with planting and harvest, manages and analyzes harvest data, and publishes trial results and annual crop reports.

The Crops Testing Program currently conducts on-farm and small-plot variety trials on grain and forage sorghum, winter wheat, dry edible pinto beans, cowpea (black-eyed peas), sunflower (confection and oil), corn, and winter canola.  We also conduct a range of agronomy trials and test new plant or soil applied products coming onto the market for use by farmers producing the above-mentioned crops.

Sally earned her M.S. degree in Soil and Crop Sciences in 2012 from CSU where she studied agronomic factors that affect grain sorghum yield and maturity in Northeast Colorado. She obtained her B.S. in Soil and Crop Sciences from CSU in 2009. Sally grew up in eastern Colorado and decided to study agronomy after working as a research intern for a seed company.  She works out of the Washington County Extension Office in Akron, CO.  Sally is a Certified Crop Advisor.

Sally Jones-Diamond
Director – Crops Testing Program
Dept. of Soil and Crop Sciences
181 Birch Ave
Akron, CO 80720
(970) 214-4611

Ed Asfeld 
Ed Asfeld photo

Ed Asfeld joined CSU’s Crops Testing Program as a Research Associate in 2015. He plants and harvests crop variety trials across eastern Colorado, including wheat, corn, sunflower, grain sorghum, and oilseeds. He also repairs, builds, and maintains equipment and vehicles that are used in the program. As the principal field person for the Crops Testing Program, Ed works with graduate students, Cooperative Extension agents, Research Station personnel, and staff at CSU and other universities. He also collaborates with area farmers,  government representatives, and crop commodity groups.

Ed grew up on a farm and graduated from high school in a small western Minnesota town. He graduated from North Dakota State University in 1990. After graduation he worked in Wisconsin for a year as a crop consultant, and then farmed full-time while doing custom combining until 2002. Ed was a retail agronomist in Wilmot, South Dakota until 2010, when he and his family moved to Colorado and he worked at Sterling as a manager and retail agronomist. Ed has been a Certified Crop Advisor since 2004.

Ed Asfeld
Research Associate
Central Great Plains Research Station
40335 Co. Rd. GG
Akron, CO 80720
(970) 554-0980

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