So I am about to spray my first ever application of PGR and I am confused on whether to overlap the spray widths vs to not overlap. I have seen several YouTube videos (LawnTips, LawnCareNut, etc.) that state do not overlap your passes. They say you barely want to "kiss" your last spray width, but looking at the various TeeJet charts they recommend at least a 20% overlap. Why the two contradicting theories or am i interpreting something wrong? Thanks.
nitram10
Trust the TeeJet charts (or whoever makes your spray tips) and use their recommended spacing for the height you are spraying. I overlap 50% to the middle of the last pass.
Teejet nozzle application rates are designed for a certain amount of overlap. The amount applied per 1k also depends on pressure, height of application and walking speed. If you look at the spec sheet for the Turbo Twin Jet, you will see that optimal height is 20 inches and spacing is 20 inches. https://www.teejet.com/CMSImages/TEEJET/documents/catalogs/broadcast_nozzles.pdf#page=6
If you then look at the chart for the red nozzle, you can see that at a walking speed of 2 MPH, you will apply 1.4 gallons/M. If you walk 4 MPH, you will apply 0.68 gallons/M. The brown nozzle will apply 1.7 gallons/M at 2MPH.
What I would recommend is that you follow the height and spacing recommendations for the type of tip you want to use. Pick a small range of colors (Most people use somewhere between red and grey). Try them out and pick the one that applies at the rate you want at your comfortable walking speed, with a pressure around 30-40 PSI, and using the optimum height and width (usually 20 inches/20 inches).
If you then look at the chart for the red nozzle, you can see that at a walking speed of 2 MPH, you will apply 1.4 gallons/M. If you walk 4 MPH, you will apply 0.68 gallons/M. The brown nozzle will apply 1.7 gallons/M at 2MPH.
What I would recommend is that you follow the height and spacing recommendations for the type of tip you want to use. Pick a small range of colors (Most people use somewhere between red and grey). Try them out and pick the one that applies at the rate you want at your comfortable walking speed, with a pressure around 30-40 PSI, and using the optimum height and width (usually 20 inches/20 inches).
Yep, the numbers in the TeeJet charts are based on optimal spacing - 20" height and 20" spacing for most 110° nozzles.
If spray uniformity is important to you, I would use the recommended spacing from the charts.
But whatever your technique, you still need to calibrate to figure out how much water you need to cover the whole lawn - because you're probably not going to walk at exactly 2mph, spray at exactly 40psi, etc. The charts should just be a guide to get you in the ballpark.
If spray uniformity is important to you, I would use the recommended spacing from the charts.
But whatever your technique, you still need to calibrate to figure out how much water you need to cover the whole lawn - because you're probably not going to walk at exactly 2mph, spray at exactly 40psi, etc. The charts should just be a guide to get you in the ballpark.
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