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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.

Colorado Sorghum Field Days

Sorghum Field Day Flyer

Colorado State University Extension, Colorado Sorghum Producers, and the CSU Crops Testing Program invite you to attend one of our Sorghum Field Days to see new and adapted hybrids side-by-side in trial plots.  We will discuss hybrid characteristics, new herbicide tolerant hybrids, production challenges, and agronomy.  The field days will be held at Walsh on Sept. 8th at 10 a.m., Akron on Sept. 9th at 9 a.m., and Sheridan Lake on Sept. 22nd at 10 a.m..

2021 Wheat 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

Jerry Johnson

Jerry Johnson is a Professor and Extension Specialist for crop production and since 1995, has been the leader of the Crops Testing Program at Colorado State University in the Department of Soil and Crop Sciences.

He obtained his B.S. from U.C. Davis and his M.S. and Ph.D. degrees from Washington State University where he studied crop variety testing. The Crops Testing Program currently conducts on-farm and small-plot variety trials on sorghum, winter wheat, dry beans, sunflower, proso millet, irrigated and dryland corn, and oilseeds for biodiesel (canola, Indian brown mustard, and camelina).

He also worked for over 12 years in West Africa as a Peace Corps Volunteer, doing food crop research and extension, and developing famine early warning systems in Benin, Mali, Cameroon, and Chad.

Dr. Jerry Johnson
Professor and Extension Specialist – Crop Production
1170 Campus Delivery
Fort Collins, CO 80525
(970) 630-9259 cell (preferred)
(970) 491-1454 office



Sally Jones-Diamond

Sally is a Research Associate for the Crops Testing Program who first joined the program in 2010 as a graduate research assistant, and then as a Research Associate after finishing graduate school in 2012.  She handles all variety trial entries and works with fellow researchers, seed company representatives, and commodity groups.  She also sets up trials, helps with planting and harvest, collects trial data, plans field days, manages and analyzes harvest data, and publishes trial results and annual crop reports.

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 newly Certified Crop Advisor (2020).

Sally Jones-Diamond
Research Agronomist
CSU Extension Office
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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