PSI to spray lawns

Discussion in 'Pesticide & Herbicide Application' started by Northwest, Mar 2, 2003.

  1. Northwest

    Northwest LawnSite Member
    Messages: 138

    I have a new spray rig and was wondering what psi is normally used to spray lawns? Teejet lawn gun, pressure gauge mounted just after the hypro D30 pump before 300 feet of hose.
  2. Ric

    Ric LawnSite Fanatic
    Messages: 11,969


    I use 30 PSI at the pump on a D 30 to spray lawns The way that I do it is to set the pressure regulator at about 75 PSI. I then put the wand in the tank and turn it on. I then open the mix valve until the pressure drops to about 30 PSI. This way I am all ways stirring the tank even when spraying. When I turn off the wand I check The PSI at the pump. I know what it is and will check from time to time. Bigger droplets are less likely to drift and I think the bigger the droplet size the better the response when applying Liquid Fert.

    Everybody does it different. How fast you run the pump, what size tip, How much area you are spraying and gun Vs wand all play a part. I am an old man so I walk slow and use a small tip.

    Other will post how they do it. Try them all and see what works for you, But be sure once you have a way to stay will it because you need the have a system to be sure you know how much you are putting down.

    I have a water meter so I just mark the tank, spray a known area and refill the tank to that mark to see what my coverage is. Others, Time how long it takes to fill a 5 gallon bucket and then time a given area.

    Good Luck
  3. SWD

    SWD LawnSite Senior Member
    Messages: 988

    I agree with Ric - however always check the label first. Some herbicides have stated max and min pressures and volume of water to a given area. When I encounter these differences in how I am currently calibrated vs what the label wants, I will recalibrate - but the customer still pays for my time.

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