Chemigating with Confidence

Chemigating with Confidence

Class ExerciseClass Exercise

GuidelinesGuidelines

Work in teamsUse your notesCalculate injection rateSet injection pump

Work in teamsUse your notesCalculate injection rateSet injection pump

Calibration – Seven Basic StepsCalibration – Seven Basic StepsDetermine 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 AssumptionsChemigation 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. DUlq 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. DUlq is 79 percent.

Chemigation CalibrationChemigation Calibration Determine size of treatment area.

Chemigation CalibrationChemigation Calibration

1,275 feet

Area = r2Area = r2

Field Size = 3.1416 x 1,300 feet x 1,300 feetField Size = 3.1416 x 1,300 feet x 1,300 feetField Size = 5,309,304 feet2 or 122 acresField Size = 5,309,304 feet2 or 122 acres

1,300 feet

Chemigation CalibrationChemigation Calibration Calculate center pivot circumference.

Chemigation CalibrationChemigation Calibration

1,275 feet

C = 2rC = 2rCircumference = 2 x 1,275 feet x 3.1416Circumference = 2 x 1,275 feet x 3.1416Circumference = 8,011 feetCircumference = 8,011 feet

1,300 feet

Chemigation CalibrationChemigation Calibration Determine product application rate

► Vydate C-LV 40 fluid ounces

Total quantity of Vydate C-LV required► 40 fluid ounces / acre x 122 acres = 4,880 ounces

Gallons =4,880 fl. oz. gallon

application 128 fl. oz.

or 38.1 gallonsor 38.1 gallons

Chemigation CalibrationChemigation 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

Material Gallons

Vydate C-LV 38.01

Water

Total

250-Gallon Batch250-Gallon Batch211.99211.99

250.00250.00

Chemigation CalibrationChemigation Calibration Determine Vydate C-LV application rate

► 40 fluid ounces

Total quantity of Vydate C-LV required► 4,880 ounces or 38.1 gallons

► 250 gallon batch

Set center pivot speed► Adjust irrigation depth for DUlq = 79 %

0.33-inch / .79 = 0.42-inch

Settings and Application RateSettings and Application Rate

Speed, %Speed, % Feet / MinuteFeet / Minute Hours / RevHours / Rev Inch(es) / PassInch(es) / Pass

5.05.0 168.0168.0 2.532.53

7.57.5 112.0112.0 1.691.69

10.010.0 84.084.0 1.261.26

12.512.5 67.267.2 1.011.01

15.015.0 56.056.0 0.840.84

17.517.5 48.048.0 0.720.72

20.020.0 42.042.0 0.630.63

25.025.0 33.633.6 0.510.51

30.030.0 28.028.0 0.420.42

35.035.0 24.024.0 0.360.36

40.040.0 21.021.0 0.320.32

45.045.0 18.718.7 0.280.28

50.050.0 16.816.8 0.250.25

60.060.0 14.014.0 0.210.21

70.070.0 12.012.0 0.180.18

80.080.0 10.510.5 0.160.16

90.090.0 9.39.3 0.140.14

100.0100.0 15.5615.56 8.48.4 0.1260.126

Settings and Application RateSettings and Application Rate

Speed, %Speed, % Feet / MinuteFeet / Minute Hours / RevHours / Rev Inch(es) / PassInch(es) / Pass

5.05.0 168.0168.0 2.532.53

7.57.5 112.0112.0 1.691.69

10.010.0 84.084.0 1.261.26

12.512.5 67.267.2 1.011.01

15.015.0 56.056.0 0.840.84

17.517.5 48.048.0 0.720.72

20.020.0 42.042.0 0.630.63

25.025.0 33.633.6 0.510.51

30.030.0 28.028.0 0.420.42

35.035.0 24.024.0 0.360.36

40.040.0 21.021.0 0.320.32

45.045.0 18.718.7 0.280.28

50.050.0 16.816.8 0.250.25

60.060.0 14.014.0 0.210.21

70.070.0 12.012.0 0.180.18

80.080.0 10.510.5 0.160.16

90.090.0 9.39.3 0.140.14

100.0100.0 15.5615.56 8.48.4 0.1260.126

Chemigation CalibrationChemigation Calibration Determine Vydate C-LV application rate

► 40 fluid ounces

Total quantity of Vydate C-LV required► 4,880 ounces or 38.1 gallons

► 250 gallon batch

Set center pivot speed► Adjust irrigation depth for DUlq = 79 %

0.33-inch / .79 = 0.42-inch

► 30 percent 28 hours

Chemigation CalibrationChemigation Calibration Determine Vydate C-LV application rate

► 40 fluid ounces

Total quantity of Vydate C-LV required► 4,880 ounces or 38.1 gallons

Set center pivot speed► 30 percent ( 0.42-inch ) or 28 hours

Injection rate ( 250-gallon batch )

Gallons / Hour =250 gallons Irrigation set

Irrigation set 28 hours

8.93 Gallons per Hour8.93 Gallons per Hour

Chemigation CalibrationChemigation Calibration Injection rate

► 8.93 gallons per hour

Pump setting► Rated at 25 gph

► Actual is 22 gph

% Setting of Pump =8.93 gallons hour

hour 22 gallons

40.6 %40.6 %

% Setting of Pump =desired gallons hour

hour capacity gallons

Chemigation CalibrationChemigation Calibration Pump setting

► 41 %

“Tweaking” the setting► Calculated setting is usually lower than actual.

► Conversion: gallons / hour to millilitersmilliliters // secondsecond

Milliliters / Second =8.93 gallons 3,785.4 milliliters hour minute

hour gallon 60 minutes 60 seconds

9.39 Milliliters / Second9.39 Milliliters / Second

Milliliters / Second =gallons 3,785.4 milliliters hour minute

hour gallon 60 minutes 60 seconds

1.05151.0515

Chemigation CalibrationChemigation Calibration Pump setting

► 41 %

“Tweaking” the setting► Calculated setting is usually lower than actual

► Conversion: gallons / hour to ouncesounces // secondsecond

Ounces / Second =8.93 gallons 128 ounces hour minute

hour gallon 60 minutes 60 seconds

0.318 Ounces / Second0.318 Ounces / Second

Ounces / Second =gallons 128 ounces hour minute

hour gallon 60 minutes 60 seconds

0.035560.03556

Verifying Pump SettingVerifying Pump Setting30 second checks until close to setting.Verify with a 5 minute check.

Site Tube MethodSite Tube MethodDetermine tube diameter.

► Use ½-inch

Calculate volume / inch.► Cylinder volume =

3.1416 x r2 x height

3.1416 x .252 x 1 inch

0.19635 inch3

► 0.554112 ounce / inch3

► 9.191 ounces / inch

Convert gallons / hour to ounces / second.

► Factor: 0.03556

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. 0.25-inch

site tube. 10-second collection is used.

3 lbs. nitrogen / acre desired. Product contains 2.76 lbs. nitrogen / gallon. 120-acre pivot. 24-hour set. 0.25-inch

site tube. 10-second collection is used.

Site Tube CalibrationSite Tube Calibration

Ounces / second = 5.435 gallons 0.03556

hour

Gallons / hour =3 lbs. N gallon 120 acres rotation

acre 2.76 lbs. N rotation 24 hours

5.435 gallons / hour5.435 gallons / hour

0.1933 ounces / second0.1933 ounces / second

Tube volume / inch =3.1416 .25 inch2 .554112 ounce

inch3

9.19118 ounces / inch9.19118 ounces / inch

Inches / 10 second catch =1.93 ounces 9.19 inches

10 seconds ounce≈ 17.75 inches≈ 17.75 inches