Model 720 Dew Simulator

No dew? No problem.

The newly redesigned Model 720 Dew Simulator allows for the precise addition of water to windrowed alfalfa. The windrow will be as soft as if it had just received the ideal amount of dew. By spraying into the windrow prior to baling, moisture is added to all of the plant material. The water softens the hay, giving the hay the appearance and test of hay made with natural dew. 

Waiting for natural dew to soften alfalfa before baling is a challenge for producers in arid areas. Many producers have tried to spray over the windrow to bring the moisture content up, only to find that just the top of the windrow becomes soft, but the leaves still shatter off most of the hay.  The Model 720 Dew Simulator from Harvest Tec has now made simulation of natural dew possible.

Learn more about the Model 720 Dew Simulator by clicking on the video links below, or scroll down for more information.


Dew Simulator Field Video


Dew Simulator Walk-Through


Dew Simulator Monitor and Setup 


Dew Simulator Winterization



How it works

The Dew Simulator preheats water to 240°F, and applies the hot mist to the windrow via a reel with tines that enter into the windrow and spray from the bottom of the windrow up, the same way that natural dew occurs in windrowed alfalfa. The heated water has been shown to soften the plant’s material more effectively than cold water, allowing the crop to retain more leaves.

What it does

  • Water is pre-heated to a target temperature of 240°F
  • 65 tine (85 tine option) cam reel enters and exits the windrow vertically, with no crop disturbance
  • Valve actuated tine rows only apply high pressure spray when inside the windrow
  • Valve actuator adjustable for windrow height
  • Valve actuation can be turned off for windrows with bottom moisture
  • 250-500 psi spray delivers fine droplets between 20 and 40 microns
  • 1% of a specially formulated surfactant added at a cost of $2/ton (10 gal per 1000 gal water)


  • Reel wing lowers to the right of the main chassis
  • Water tank is operator supplied to be pulled directly behind (1000 gallons recommended and will treat 80 tons)
  • PTO driven pump runs on 1000 rpm to deliver 15 gpm@750 psi
  • 2 in-series diesel fuel water heaters deliver 750,000 BTU each for total of 1,500,000 to raise water temperature 180°F at 18 gpm
  • Water heaters use 5-11 gallons per hour of #2 diesel during operation
  • 70-100 HP tractor recommended

Operator Adjustments

  • Operation speeds between 2 and 10 mph to be matched to speed of baling
  • Water delivery of 10 to 18 gallons per ton depending on how dry the hay is
  • Treatment width is adjustable between 40 and 59 inches
  • Treatment height is adjustable between 8 and 20 inches
  • Tip selection is matched to treating/baling speed (10-60 tons per hour coved by 3 tip sets)



Contact Harvest Tec directly for pricing and availability.