ID # 18997560

Unverferth Pro-Force Dry Fertilizer Spreader

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Unverferth Fertilizer Equipment

Versatile features, high-quality components and operator friendly! The Unverferth Pro-Force dry fertilizer spreader, compost spreader, poultry litter spreader and cover crop seed spreader features operator-friendly innovations, top-of-the-line performance, heavy-duty components and can spread up to four products at the same time with variable rate. These features make the Pro-Force dry granular spreader the ideal match for commercial applicators, professional producers and growers of all sizes.

Pro-Force Dry Fertilizer Spreader
Sale Type

Exclusive Tank Design

  • Gray-colored poly tanks are available in 2600, 1800 and 1400 gallon capacities which means more acres covered per fill
  • Containment-tank sump functions like a sump-within-a-sump for holding the last 30-50 gallons of liquid on side-hills and inclines to maintain a primed pump
  • Stainless steel baffle for load stability in the field or going down the road

Convenience Is Key

  • Front and rear tank-volume indicators with red ball float for easy viewing from the tractor cab and from the rear of unit for quick, easy filling
  • 3” quick-fill for faster tank loading from ground level on the rear of the unit
  • 9-gallon clean-water tank equipped with eye-wash tube and spout for quick response

Pumps & Accessories

  • Hydraulic pump with pulse-width modulation for enhanced application at the correct pressure at varying field speeds
    • Optional hydraulic-operated stainless steel pump for longer life
  • Optional inductor system easily adds micronutrients from ground level and includes agitation to keep the fertilizer in proper suspension while applying
  • Optional steerable hitch provides added steering control on end rows to minimize crop damage during turns

Transportation Innovation

  • Innovative, patent-pending side-fold design to acheive a narrow transport width
    • Models 2600 and 1800 feature a 14' 9" transport width and model 1400 features a 13' 4" transport width
  • Toolbar sizes of 90', 88', 80', 66', 60’, 44' and 40' depending on tank size to accommodate 30", 22" and 20” row spacings
    • 90' toolbars fold and operate at 60', 60’ toolbars fold and operate at 40’
    • 40' toolbars are available as rigid or dual-width which will fold and operate at 30'
  • Coulters on the center toolbar section feature 18" of ground clearance on models 2600 and 1800 and 13.5" of ground clearance on model 1400 when in the road transport position

Industry-Leading Field Performance

  • 36" of toolbar clearance allows you to apply at later growth stages when it is needed most by the plant
  • Hydraulic pressure provides active toolbar down force to keep the coulters in the ground for consistent penetration
  • Hydraulic wing tilt feature automatically raises the toolbar 15Ëš for minimizing crop damage while turning on end rows
  • Parallel linkages on models 2600 and 1800 provide optimum down pressure on the coulters for consistent fertilizer positioning in the row
  • Tool-free adjustable gauge wheels mounted on the mid and outer wings
    • 4 guage wheels total on models 2600 and 1800 and 2 guage wheels total on model 1400
  • Electric Flo-Bak® ball valves mounted on toolbar for a faster response time and fertilizer savings
  • 6-section control on 80' and larger toolbars and 5-section control on 66' and smaller toolbars for applying where needed
  • Standard flow ball indicator system allows you to easily monitor the flow to each row
  • ISOBUS equipped to easily connect with your tractor’s VT screen
    • Optional Raven 450 rate controller with Astro II GPS Receiver
  • Injection nozzle or knife injector mounted on a heavy-duty, 1/2” thick bar for consistent and long-term on-target application

Durability Comes Standard

  • Models 2600 and 1800 feature a toolbar constructed of dual, 5”x 7” tubes on the center section and mid-wings and a single 6”x 6” tube on the outer wing
  • Model 1400 features a toolbar constructed of a single, 7"x7" tube on the center section and wings
  • Six-bolt coulter hubs for extended life with 1,500 lbs. of down pressure for consistent penetration depth regardless of soil density
  • Square-tube coulter posts mounted to the toolbar with cast clamps for added vertical performance and life
  • Choose from straight or wavy coulters that swivel up to 15 degrees in each direction for accurately following the terrain; greasable pivot for greater longevity
  • Optional closing wheel package helps fill the slot created by the coulter with soil to prevent fertilizer loss
  • Choice of red or green high-quality powder coat finish that resists corrosion

TerrainPro Row Unit

  • 20” lead coulter features 1,500 lbs. of down pressure and 6-bolt greaseable hub with 5 layers of seal protection for long-term, trouble-free use.
  • Free-floating row cleaners follow ground contours independently from the lead coulter and clear residue from the strip. The curved finger design prevents trash from wrapping and width adjustment allows the operator to adapt the row cleaner to varying conditions.
    • Row cleaners feature 4-bolt hubs with triple-lip seals and tapered roller bearings.
    • Standard add-on weights allow the operator to increase down pressure if needed.
  • Independent row unit depth is maintained by the crowfoot depth control wheel that runs between the row cleaners and the shank for consistent shank depth from row to row.
    • The 16” diameter crowfoot design prevents mud, rocks and other debris from building up, allowing the operator to run in varying conditions.
    • Each row unit features independent parallel linkage which allows it to free-float 7” upward and 4” downward to follow uneven terrain which ensures that each shank runs at the same depth for consistent tillage and fertilizer placement.
    • Optional rock guard crowfoot depth control wheel with reinforcing rings adds strength in rocky soil.
    • Optional rubber depth control wheels with scrapers are available for extremely rocky and tacky soil conditions.
  • The shank features tool-free height adjustment from 6” to 12” deep and a convenient depth gauge allows the operator to quickly and easily adjust each shank.
    • Available with spring-cushioned auto-reset trip mechanism with 2,000 lbs. of point load pressure or shear-bolt protected shank with 5,000 lbs. of shear pressure.
    • Replaceable 2 ¼” cast point and 1 ½” wide integrated wear bar provides long-term, trouble-free use.
    • Replaceable shank wear plates are standard to protect the shank from abrasive soil.
  • 18” notched concave closing coulters on each side of the shank keeps the soil in the path of the trailing basket. Each coulter floats independently from the other to keep constant ground contact through uneven terrain.
    • Tool-free width and angle adjustment allows the operator to easily change the width of the strip and height of the berm.
    • Each closing coulter features tool-free adjustable spring down pressure and angle adjustment to control the amount of soil being sent into the berm.
    • Closing coulters utilize 6-bolt hubs with triple-lip seals for long-term, trouble-free use.
  • The trailing 14” diameter crowfoot conditioning baskets break up clods, condition the berm and feature a unique design to prevent plugging with mud, rocks or other debris.
    • Each crowfoot conditioning basket rolls independently from the other and features tool-free adjustable down pressure.
    • Optional trailing 15” conventional Rolling Harrow basket in-lieu of the crowfoot conditioning basket for added tillage action.
    • Optional 15” rubber press wheels in-lieu of the crowfoot conditioning basket for added soil firming.
chassis mount

Fertilizer Systems

  • Dry or liquid fertilizer application systems are available for pull-type models of the Raptor strip tillage tool and the tanks are located behind the toolbar for better row unit visibility from the tractor cab and easier filling from behind the machine.
  • Both systems feature a standard Raven RCM ISOBUS controller which allows the operator to control the rate from the tractor's virtual terminal screen.
    • This system integrates with section control and pre-loaded field prescriptions.
  • 380/90 x 46 dual wheels and tires maximize flotation and provide a stable ride during road transport.

Dry Fertilizer - DT Models

  • Dry fertilizer system is available for pull-type models and features dual, custom-molded poly tanks for applying 1 or 2 products with variable rate. Dual 6-ton poly tanks for a total capacity of 12-tons of dry product.
    • Weather-tight lids protect the fertilizer in the tank.
    • Hydraulically powered blower fan feeds the 2” dry fertilizer plumbing.
    • Ergonomic ladder and platform provide convenient access to the top of the tanks.
    • 2-section control for each product and standard blockage monitors alert the operator on the ISOBUS screen when a row unit is blocked.
    • Standard scale system integrates with the ISOBUS controller for accurately tracking dry fertilizer applied and provides convenient rate calibration. 

Liquid Fertilizer - LT Models

  • Liquid fertilizer system features a custom-molded 1200-gallon T-shaped tank which holds the last 50 gallons of liquid in the sump to always maintain a primed pump, even on side hills.
    • Ace 750 PWM hydraulic pump is standard with 4-section rate control.
    • Standard flow ball monitor allows the operator to easily monitor the flow to each row.
    • Optional chemical inductor for quickly adding micronutrients or stabilizer.
    • Optional Ace 750 stainless steel PWM hydraulic pump in-lieu of Ace 750. 

Nitrogen Fertilizer & Application

  • Dry/Granular by Broadcasting – Urea contains 46% nitrogen
  • Gas/Vapor by Banding - Anhydrous Ammonia contains 82% nitrogen
  • Liquid by Injection – UAN Solutions contain 28% or 32% nitrogen

Ways We Lose Nitrogen

  • Denitrification – temperature, moisture and pH play a major roll.  If the soil is cold and saturated, active soil organisms take oxygen from the nitrate molecule, which converts it to Nitrous Oxide, Di-nitrous Oxide or pure nitrogen gas, becoming unusable.  These gases are released into the atmosphere, otherwise known as denitrification
    • Denitrification is most serious on soils that are poorly drained but can occur on any soil that is saturated with water
  • Volatilization or Urea Hydrolysis – a biological process that occurs when the urea molecule converts to ammonia gas and is released into the atmosphere
  • Leaching – the nitrate molecule is not held by the soil and will be carried by water.  This movement of nitrogen through the soil can deliver nitrates below the roots into the subsoil, otherwise known as leaching
    • Leaching is most serious on well-drained, sandy and gravelly soils but also can occur on well-drained upland limestone and shale soils

Ways We Can Minimize Loss

  • Delaying part of the nitrogen application until corn is 10 to 16 inches tall (sidedressing) can minimize leaching and denitrification when corn needs it the most
    • Corn needs nitrogen at each stage of development, however, the most nitrogen is required prior to the grain fill period
  • Incorporating fertilizers that contain urea into the soil within 24 hours can minimize volatilization


  • Approximately 1 pound of nitrogen yields 1 bushel of corn
    • If the goal is 200 bushels of corn per acre, then 200 pounds of nitrogen per acre is needed
    • Ideally, 50 pounds applied at planting and 150 pounds at sidedressing (when the plant is between 10 and 16 inches tall and needs it most)
Model 2250 2050 1850 1650 1450 1350 1250
Due to continuing improvements in the design and manufacture of Unverferth products, all specifications contained herein are subject to change without notice.
Hopper Length 22' 20' 18' 16' 14' 13' 12'
Hopper Width 8' 6"
Hopper Height 6' 10" 5' 10"
6' 10" (with 12" sides)
Hopper Side Slopes 50°
Struck Capacity - Cubic Feet 710 645 580 515 450 415 270
385 (with 12" sides)
Duo-Force Struck Capacity - Cubic Feet 175 (reduces the main hopper capacity by this amount) 120
175 (with 12" sides)
Tri-Force Struck Capacity - Cubic Feet 75 -
Quad Force Struck Capacity - Cubic Feet 37.5 (reduces the Tri-Force hopper capacity by this amount) -
Capacity - Tons of Fertilizer 22 20 18 16 14 13 8.5
12 (with 12" sides)
Duo-Force Capacity - Tons of Fertilizer 6 (reduces the main hopper capacity by this amount) 4
6 (with 12" sides)
Tri-Force Capacity - Tons of Fertilizer 3 -
Quad Force Capacity - Tons of Fertilizer 1.5 (reduces the Tri-Force hopper capacity by this amount) -
Pull-Type Overall Length 31' 3" - 27' 3" - 23' 3" - -
Pull-Type Overall Height 10' 4" - 10' 4" - 10' 4" - -
Pull-Type Transport Width 11' 9" - 11' 9" - 11' 9" - -
Pull-Type Spinner Ground Clearance 40" - 40" - 40" - -