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Top Ag Agronomy Department


Top Ag is continuing to strive to become growers’ first choice in the area when it comes to your agronomic service and product needs. Our commitment to this goal will be accomplished by providing exceptional service, innovative programs, and competitive prices.

Our agronomy department consists of three base operation locations including Okawville, Trenton, and Pierron. Along with the many services that we provide at each location (which are listed at the bottom right of this homepage) we also provide the R7 tool by Winfield, and Climate Pro by Monsanto. TOP AG ALSO PROVIDES DIFFERENT FINANCING OPTIONS FOR ALL AGRONOMIC PRODUCTS AT VERY COMPETITIVE INTEREST RATES!!!!

Some of the fertilizer products that we offer at each agronomy location are as follows: Anhydrous Ammonia 82-0-0, Liquid 28%, Dry Potash 0-0-60, DAP 18-46-0, Urea 46-0-0 and Limestone. Along with those main foundation products to a successful crop we also provide dry and liquid micro and macro nutrients that are vital to cropping systems which are focused on plant health, plant efficiency, and most importantly plant yield. These products can be purchased for application by the grower or by Top Ag custom application from a top of the line fleet.

Fertilizing your fields is obviously a critical step in producing a high yielding crop. Another building block to a highly productive acre is crop protection. Top Ag provides crop protection products from all of the leaders in the industry including: Winfield, Monsanto, Syngenta, Dow Agrisciences, Valent, Dupont, Bayer, and BASF. Use recommendation and effective product placement is key to a strong (weed free) crop. The recommendations and product placement come from an effective team of Sales Agronomists which include: Doug Horstmann (Trenton) and Tyler Gross (Trenton), Josh Tebbe (Pierron), Brandon Buss (Okawville) and Andrew Rensing (Okawville). Along with the agronomists, Willie Harris (Top Ags’ Agronomy Manager) offers insight which is headed by 35 years of agronomic experience. 

Our growers are fortunate to get to choose from a variety of seed options when it comes to Corn, Soybeans, Wheat, and cover crops. These seed companies include: Croplan by Winfield, NK Mycogen, Dekalb, Asgrow, E-merge, Lacrosse, Agrimax and Agripro. Although we provide a range of different seed options the most important factor when it comes to seed is picking the right hybrid and placing it on the right acre. Top Ag agronomists provide placement of any seed on all acres at no charge by utilizing the R7 tool By Winfield.

Finally, Top Ag Agronomy provides soil testing and field mapping which can be integrated with our custom application equipment that is all equipped with GPS guidance and VRT (variable rate technology). For those growers that prefer to do their own application we provide anhydrous tanks and toolbars, and for application of dry fertilizer Top Ag also has a lineup of dry buggies at each location.


      Top Ag Agronomy Article



Top Ag is excited to announce that we will be offering our wheat rebate program again, in which a customer can earn up to $15/acre!  Each year more growers are taking advantage of this productive offer.  The program includes seed wheat, a fall fertilizer application, two-passes of Nitrogen, a spring herbicide/fungicide application, a spring head scab fungicide application, and double crop seed beans.  Call your sales agronomist for details and to see how to qualify.

With many prevent plant acres this year, cover crops are expected to be in high demand.  Whether you are wanting to prevent erosion, grow some forage crops, or increase the organic matter in your fields, Top Ag has many options to help you achieve your goal.  Supplies are limited however, so please contact Top Ag and reserve your cover crop seed today.               

Jake Greten

Seed & Warehouse Manager





Top Ag Agronomy Services

Anhydrous Ammonia

Custom Application
for Preplant
Custom Application
for Side Dress
NH3 Side Dress Applicator Rental
NH3 Delivery
NH3 Toolbar Rental




Custom Dry Application
VRT Dry Application
Custom Blending
Fertilizer Buggy Rental
Dry Fertilizer Delivery

Liquid Applications

Custom Liquid Application
Drop Spraying
Helicopter Aerial Application
Airplane Aerial Application
Chemical & Liquid Delivery 



Testing, Calibration & Seed

Soil Testing
Grid Sampling

Bulk Seed Treatment
Bulk Seed Delivery

Lime Services

Lime Hauling
Custom Applied Lime
VRT Custom Applied Lime


Agronomy Team Contacts

Name Title Phone Email
Willie Harris Agronomy Dept Manager 618-243-3356 or 618-534-8908 (cell)
Doug Horstmann
Agronomy Manager / Salesman, Trenton
618-224-7812 or 618-578-3349 (cell)
Andrew Rensing
Agronomy Salesman, Okawville 618-243-3353 or 618-795-2600 (cell)
Brandon Buss
Agronomy Salesman, Okawville 618-243-3391 or 618-314-2841(cell)
Tyler Gross
Sales Agronomist, Trenton
618-410-9467 (cell)
Josh Tebbe
Sales Agronomist, Pierron
618-654-9804 or 618-520-0437
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