Chemigating with Confidence Class Exercise

Guidelines Work in teams Use your notes Calculate injection rate Set injection pump Work in teams Use your notes Calculate injection rate Set injection pump

Calibration – Seven Basic Steps Determine the: 1.Size of the treated area, in acres. 2.Pivot circumference, in feet. 3.Pivot travel speed, in feet per minute. 4.Product used and application rate. 5.Total amount of product required. 6.Injection rate in gallons per hour. 7.Injection pump setting. Determine the: 1.Size of the treated area, in acres. 2.Pivot circumference, in feet. 3.Pivot travel speed, in feet per minute. 4.Product used and application rate. 5.Total amount of product required. 6.Injection rate in gallons per hour. 7.Injection pump setting.

Chemigation Assumptions A grower will apply Vydate C-LV to a potato field for nematode suppression. Pivot to last tower is 1,275 feet. Wetted radius is 1,300 feet. No swing arm & endgun will be disabled. Target irrigation depth is 0.33-inch water. Application rate is 40 ounces per acre. 250-gallon tank will be used. Diaphragm pump output is 22 gallons / hour. DU lq is 79 percent. A grower will apply Vydate C-LV to a potato field for nematode suppression. Pivot to last tower is 1,275 feet. Wetted radius is 1,300 feet. No swing arm & endgun will be disabled. Target irrigation depth is 0.33-inch water. Application rate is 40 ounces per acre. 250-gallon tank will be used. Diaphragm pump output is 22 gallons / hour. DU lq is 79 percent.

SPRINKLER CHEMIGATION ●End guns must be turned off during the application, if they irrigate nontarget areas. ●It is recommended that nozzles in the immediate area of control panels, chemical supply tanks and system safety devices be plugged to prevent contamination of these areas. ●Do not apply when wind speed favors drift beyond the area intended for treatment. ●Do not apply when system connections or fittings leak or when nozzles do not provide uniform distribution.

Chemigation Calibration  Determine size of treatment area.

Chemigation Calibration 1,275 feet Area =  r 2 Field Size = x 1,300 feet x 1,300 feet Field Size = 5,309,304 feet 2 or 122 acres 1,300 feet

Chemigation Calibration  Calculate center pivot circumference.

Chemigation Calibration 1,275 feet C = 2r  Circumference = 2 x 1,275 feet x Circumference = 8,011 feet 1,300 feet

Chemigation Calibration DDetermine product application rate ►V►Vydate C-LV 40 fluid ounces TTotal quantity of Vydate C-LV required ►4►40 fluid ounces / acre x 122 acres = 4,880 ounces Gallons= 4,880 fl. oz.gallon application128 fl. oz. or 38.1 gallons

Chemigation Calibration  Determine Vydate C-LV application rate ► Vydate C-LV 40 fluid ounces  Total quantity of Vydate C-LV required ► 4,880 ounces or 38.1 gallons MaterialGallons Vydate C-LV Water Total 250-Gallon Batch

Chemigation Calibration DDetermine Vydate C-LV application rate ►4►40 fluid ounces TTotal quantity of Vydate C-LV required ►4►4,880 ounces or 38.1 gallons ►2►250 gallon batch SSet center pivot speed ►A►Adjust irrigation depth for DU lq = 79 % 0.33-inch /.79 = 0.42-inch

Settings and Application Rate Speed, % Feet / Minute Hours / Rev Inch(es) / Pass

Settings and Application Rate Speed, % Feet / Minute Hours / Rev Inch(es) / Pass

Chemigation Calibration  Revolution Time: Pivot Speed Settings and Application Rate Speed, % Feet / Minute Hours / Rev Inch(es) / Pass adj ? X Inch, Applic. Depth = X Gallons ? Hours Hour x Minute x Gallons x Cubic Feet Rotation % System Eff. MinuteRotation452.5 X Acres

Pivot Speed Settings and Application Rate Speed, % Feet / Minute Hours / Rev Inch(es) / Pass ? Ratio:45.28? : 0.30? Or, ? = 42 %

Chemigation Calibration DDetermine Vydate C-LV application rate ►4►40 fluid ounces TTotal quantity of Vydate C-LV required ►4►4,880 ounces or 38.1 gallons ►2►250 gallon batch SSet center pivot speed ►A►Adjust irrigation depth for DU lq = 79 % 0.33-inch /.79 = 0.42-inch ►3►30 percent 28 hours

DDetermine Vydate C-LV application rate ►4►40 fluid ounces TTotal quantity of Vydate C-LV required ►4►4,880 ounces or 38.1 gallons SSet center pivot speed ►3►30 percent ( 0.42-inch ) or 28 hours IInjection rate ( 250-gallon batch ) Gallons / Hour = 250 gallonsIrrigation set 28 hours 8.93 Gallons per Hour

Chemigation Calibration IInjection rate ►8►8.93 gallons per hour PPump setting ►R►Rated at 25 gph ►A►Actual is 22 gph % Setting of Pump = 8.93 gallonshour 22 gallons 40.6 % % Setting of Pump = desired gallonshour capacity gallons

Chemigation Calibration PPump setting ►4►41 % ““Tweaking” the setting ►C►Calculated setting is usually lower than actual. ►C►Conversion: gallons / hour to m mm milliliters / second Milliliters / Second = 8.93 gallons3,785.4 millilitershourminute hourgallon60 minutes60 seconds 9.39 Milliliters / Second Milliliters / Second = gallons3,785.4 millilitershourminute hourgallon60 minutes60 seconds

Chemigation Calibration PPump setting ►4►41 % ““Tweaking” the setting ►C►Calculated setting is usually lower than actual ►C►Conversion: gallons / hour to o oo ounces / second Ounces / Second = 8.93 gallons128 ounceshourminute hourgallon60 minutes60 seconds Ounces / Second Ounces / Second = gallons128 ounceshourminute hourgallon60 minutes60 seconds

Verifying Pump Setting 30 second checks until close to setting. Verify with a 5 minute check.

Site Tube Method Determine tube diameter. ► Use ½-inch Calculate volume / inch. ► Cylinder volume = x r 2 x height x.25 2 x 1 inch inch 3 ► ounce / inch 3 ► ounces / inch Convert gallons / hour to ounces / second. ► Factor: Convert volume to inches. ► Use 10 second collection. ► Ounces collected x 9.2

3 lbs. nitrogen / acre desired. Product contains 2.76 lbs. nitrogen / gallon. 120-acre pivot. 24-hour set inch site tube. 10-second collection is used.

Site Tube Calibration Ounces / second = gallons hour Gallons / hour = 3 lbs. Ngallon120 acresrotation acre2.76 lbs. Nrotation24 hours gallons / hour ounces / second Tube volume / inch = inch ounce inch ounces / inch Inches / 10 second catch = 1.93 ounces9.19 inches 10 secondsounce ≈ inches