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.

Recent Crop Publications

2018 Spring Crop Report (individual location results for corn, sunflower, dry bean, forage and grain sorghum trials)

2018 Corn Report (Making Better Decisions)

Recent Trial Results/Updates

Sunflower Oil Trials  (Oil content added to oil trial tables and confection seed sizes added to confection results table)

Western Slope Trial ResultsDelta Dry Bean Trial, Hayden Winter Wheat Trial, and Fruita Alfalfa Trial (trials conducted by Fruita Research Station)

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, and commodity group representatives.  She also sets up trials, helps with planting and harvest, collects trial data, plans field days, manages and analyzes harvest data, and creates 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 was born and raised in eastern Colorado and decided to study agronomy after working as a research intern for a seed company.  She currently works out of the Extension Office in Akron, CO and is happy to be back in eastern CO after living on the Front Range for 13 years.

Sally Jones-Diamond
Research Associate
CSU Extension Office
181 Birch Ave
Akron, CO 80720
(970) 214-4611

Ed Asfeld 

Ed Asfeld joined CSU’s Crops Testing Program as a Research Associate in 2015. He plants and harvests multiple crop variety trials across eastern Colorado, including trials of wheat, corn, sunflower, grain sorghum, and oilseeds. He also repairs, builds, and maintains equipment, machinery, 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, scientists, government representatives, and crop commodity groups.

Ed grew up on a farm and graduated from high school in a small West-Central 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 with Farmers Co-op of Wilmot in 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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