Centennial Ag Supply Co. is here to help you achieve the greatest return per acre.  We recognize the complexity and myriad of factors that affect crop yield.  It’s not just the products you use.  Strategy, flexibility to changing conditions, timing and application methods also play a vital role in getting the results you expect.

That’s why we work side by side with you to understand your needs and risks.  Our experts create custom growing programs and strategies for your operation.   To ensure consistent and predictable results we do extensive research for and with you.  Our team of local experts, many who grew up in agriculture, is personally committed to helping you optimize your return on investment. 

Agriculture is not just a vocation to us…it’s our passion.

Sales Team

Eric Johnson, Eastern Regional Manager - Julesburg, CO, Kersey, CO, Yuma, CO, Imperial, NE, Holyoke, CO, Corporate Office

As Eastern Regional Manager, Eric leads our operations team in the areas of application and delivery at our locations in northeastern Colorado and southwest Nebraska. His hands on experience, attention to detail, and leadership skills bring a high level of service excellence to our grower’s farms. Eric trains our staff in the field as well as the classroom in the areas of professional application and customer experience. Eric is known for his dedication to the surrounding community. Eric is the sole recipient of Centennial Ag Supply Co.'s "Hero Award," in honor of his high level of integrity and commitment to our company. Eric was recognized with this award appreciating all he does for his team and the growers in the community.

Alan Curtis, Wyoming Regional Manager - Pine Bluffs, WY

Alan has been in the Retail Fertilizer and Chemical business since 1974. He is a Certified Crop Advisor (CCA) in Nebraska and at the Federal level. As well, Alan retains a Commercial Applicator license for Colorado, Nebraska, and Wyoming and earned his Associate of Science certificate through Western Nebraska Community College in Scottsbluff, Nebraska. Throughout his professional career, he has been involved in nearly every phase of agriculture related to fertilizer and chemicals. Alan takes pride in maintaining an efficient and professional office and outlet. His primary focus is quality service and profitable harvests by always putting the growers’ needs first.

Brad Walker, Company Agronomist - Corporate Office

Brad earned his Bachelor of Science degree in Soil Science in 1982 from University of Wisconsin-Stevens Point.  With nearly thirty years of experience in crop consulting, Brad currently works as the “Company Agronomist” for Centennial Ag Supply Co. Brad also consults with and trains the sales staff in all of our locations.  He actively conducts research primarily involving fertilizer and pesticide applications at the Centennial Ag Supply Research farm and other locations. Brad uses his research and knowledge to work with growers by checking fields and advising them on fertility management, irrigation management, and pest management. His many professional certifications include: Certified Crop Advisor, Certified CDPH&E Scentometer Reader, EPA Certified Worker Protection Trainer, CDA Certified Commercial Pesticide Applicator - Qualified Supervisor, USDA-Approved Independent User of Sealed Nuclear Sources - Neutron probe,  NAICC Certified Crop Consultant & Researcher, Certified Technical Service Provider (TSP) for the USDA-NRCS, and Approved Investigator by the Colorado Oil & Gas Conservation Commission. Brad is also a speaker at professional and educational meetings, such as CSU, USDA, EPA, NAICC, IACC ,CALCP and CAS.

Brian Grasmick

Brian Grasmick, Field Representative - Kersey, CO

Brian is a Crop Advisor with over 20 years of experience in the agriculture industry. He is a University of Wyoming graduate with a Bachelor of Science in Agronomy. Brian holds a Qualified Supervisor License (QS) through the Colorado Department of Agriculture. His passion for improving crop production and protection for all of his customers is a daily focus and he uses it to the benefit of his growers.

Steve Krosky

Steve Krosky, Field Representative - Kersey, CO

Steve has a passion for crop production. As a native Coloradoan, he knows this region’s climate and challenges. Steve is a graduate of Colorado State University with a Bachelor of Science degree in Agronomy. With over 32 years of experience in the field of crop production, as a production agronomist, as a crop consultant, and in agronomy sales, he works with growers to help them increase their yields. In his seven years with Centennial Ag Supply Co, Steve enjoys working with growers, and creating strong customer relationships.

Spencer Vasa

Spencer Vasa, Field Representative - Holyoke, CO

Spencer grew up on a farm south of Holyoke, Colorado and has been involved in agriculture all his life. Spencer attended Northwest College in Powell, Wyoming.  In 2007, he received his Commercial Applicator License through the Nebraska Department of Agriculture. Spencer has been in the retail fertilizer and crop production industry for six years, four years as an Applicator and two years as a Sales Representative. Spencer is very experienced with sugar beets, potatoes, corn, wheat, and edible beans.  His passion is to aid his growers and produce maximum results. 

Kody Blochowitz

Kody Blochowitz, Field Representative - Julesburg, CO

Kody grew up and worked on a 5,000-acre farm near Julesburg, Colorado.  After obtaining an Associates degree from ITT in Arizona, Kody came back to Colorado to work on his family farm.  In addition to his life-long hands-on experience, he has worked in the Ag Supply business for 3 years.  He holds a pesticide applicator license in Nebraska with reciprocity in Colorado.  He has also earned certificates in Professional Applicator Training, HAZ-MAT Training and various safety trainings.  Kody is passionate about agriculture and takes every opportunity to increase his knowledge through classes and training to help our growers.

Steve Brott

Steve Brott, Field Representative - Julesburg, CO

Steve has been in crop consulting, grain merchandising, seed conditioning, agronomy sales, and farm management for nearly twenty-three years. He has focused on agronomy sales for the past twelve years. Steve earned an associate’s degree in Agriculture Sales from Aims Community College in Greeley, Colorado. Steve enjoys and is passionate about helping his growers achieve premium results. 

Jonathan Ferrari

Jonathan Ferrari, Field Representative - Yuma, CO

Jonathan was born and raised in Yuma, Colorado where his passion for the agricultural industry began watching his father work as an agronomist. Jonathan learned that a career in agriculture was a natural fit for him while working as a hired hand on a local Yuma county farm producing corn, wheat, forages, and cattle. He broadened his knowledge of ag while attending Colorado State University where he received his Bachelor's of Science Degrees in Ag Business and Soil & Crop Science. While attending CSU, Jonathan participated in Centennial Ag Supply's summer internship program as a research and agronomy assistant to Brad Walker. During the internship program Jonathan worked between multiple locations scouting fields and preparing local field research trials. Jonathan is dedicated to apply his knowledge and helping growers optimize their yields through the use of innovative product and technology applications.


Cole Brodin

Cole Brodin, Field Representative - Yuma, CO

Cole grew up in Elizabeth, Colorado. Cole's interest in agriculture began at an early age, shown by his involvement in 4-H club for thirteen years. Three of those years he served as President. In 4-H, Cole focused primarily on showing market animals and the shooting program. After high school Cole attended Concordia University, where he studied Business Administration with a concentration in Ag Business. After two years at Concordia, Cole transferred to Colorado State University and obtained his Bachelors Degree in Ag Business. After graduation from CSU, Cole went to work for an Aviation company in Yuma, Colorado as a field representative. Cole is passionate about the Ag industry and customer service. He works with his growers to ensure that they are getting exactly what they need to maximize yield. "I took a position with Centennial Ag Supply Co. because they believe that their purpose is to bring growers success. I believe that is my purpose as well."