# Machinery Management Using Precision Agriculture Technology

Assignment #10

Application Technology Problems

Liquid Application Problems

1. A farmer wants to apply a burndown herbicide to his no-till field at a rate of 12 gallons of spray mix per acre. His tractor

speedometer has been calibrated and indicates he will be traveling an average speed of 9 miles per hour. But with previous data, a speed

range from 5 to 12 mph might be expected. The sprayer boom width is 60 feet and has a nozzle spacing of 20 inches. What should be the

flowrate from each nozzle and what size nozzle should be used at what pressure range? Utilize a AIXR TeeJet Air Induction XR nozzle for

this problem.
The nozzle flow rate can be calculated from the following equation:
GPM = GPA x S x W
5,940
Where
GPM = nozzle flow rate (gallons per minute)
GPA = sprayer application rate (gallons per acre)
S = speed (miles per hour)
W = width sprayed by each nozzle (inches)
5,940 = a constant for conversion of units
Reference, TeeJetĀ® Technologies Product Catalog, Catalog 51A at http://www.teejet.com/literature_pdfs/catalogs/C51A/cat51a_us.pdf for

nozzle selection.

2. A farmer wants to sidedress nitrogen to a corn crop at varying rates from 50 to 100 pounds of nitrogen per acre. He will be using a

28% UAN as the source of nitrogen (Note: a conversion from lbs/acre to gal/acre will need to be made). His tractor speedometer has been

calibrated and indicates he will be traveling 8 miles per hour. The sprayer boom width is 60 feet and has a nozzle spacing of 30 inches.

What should be the range of flow rates from each nozzle and what size nozzle should be used at what range of pressures? Utilize a Stream

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Jet VR nozzle – http://www.teejet.com/literature_pdfs/bulletins/B101_SJ-VR.pdf
or Vari-Target nozzle – http://www.spraytarget.com/varitarget.htm for this problem.

Dry Fertilizer Application Problems

3. A farmer wants to apply phosphorus at rates varying from 30 to 150 pounds per acre. (Note: you will need to convert lbs of phosphorus

per acre to lbs of DAP per acre. DAP is 18% phosphorus or analysis of 18-46-0) He will be using a DAP as the source of phosphorus with a

density of 60 pounds per cubic feet. His tractor speedometer has been calibrated and indicates he will be traveling 12 miles per hour.

The fertilizer cart has a spread width is 60 feet. What gate height and range of drive RPMs will provide the combination is required for

this application?
4. A farmer wants to apply potash at rates varying from 50 to 200 pounds per acre. (Note: in this problem potash is the product so no

conversion is needed.) The potash he will be using has a density of 72 pounds per cubic feet. The fertilizer cart has a spread width is

60 feet. He wants to have a gate height setting of 2 inches. What would be an adequate drive RPM range and a travel speed combination

would be required for this application?