# Sprayer Calibration

March 28, 2014 02:54 AM

By: Gary Bates, Director of the University of Tennessee Beef and Forage Center

Before you can accurately apply the right amount of herbicide to a field, you have to know how much volume the sprayer is applying to each acre. Sprayer calibration is not difficult, but it can be challenging if you have never seen it done before. Here are two simple methods of spraying calibration:

Spray and acre method: In this method, you fill the tank with water, spray an acre, then see how much water it takes to refill the tank. Pretty simple, but takes a little time. You also have to be exact on the land area measurement.

1/128th method: this is a relatively fast and accurate method.

1. Select a course length based on nozzle spacing (from chart below)

2. Measure out course in field to be sprayed.
3. Measure time to drive course. Use a comfortable gear and speed. Take the
average of three trips.
4. Park tractor and catch the ouput from one nozzle for the time found in step 3.
5. Measure in ounces. This will equal the gallons per acre output.

Example: You have a pasture that is 5.4 acres large. You would like to spray 1.6 pints of GrazonNext HL per acre. How much herbicide do you need to add in each tank? You have a sprayer that holds 100 gallons with nozzles spaced 20 inches apart.

• You need to measure a course 204 feet in length.
• You drive it three times and average 46 seconds to drive the 204 feet.
• You park the tractor and catch the spray from one nozzle for 46 seconds. Measures 18.5 ounces. You are applying 18.5 gallons per acre.
• The sprayer holds 100 gallons, so 100 gallons ÷ 18.5 gal/acre = 5.4 acres can be covered with each tank.
• 1.6 pints per acre GrazonNext x 5.4 acres =
• 8.6 pints GrazonNext needs to be added to each tank.

Back to news

No comments have been posted to this News Article

## U.S. Is Said to Make Dairy Proposal That Canada Flatly Rejects

By
•  When â€śHelp Wantedâ€ť Ads Need Help 10/16/2017 09:18 AM
•  When â€śHelp Wantedâ€ť Ads Need Help 10/16/2017 09:18 AM
•  Democrats accuse EPA's Pruitt of misusing taxpayer funds 10/16/2017 12:21 PM
•  Cattle Markets Post A Rally 10/16/2017 09:06 AM
•  Earning Others' Trust at Work 10/16/2017 05:34 AM
•  Agriculture Technology Development Takes Partnerships 10/13/2017 12:14 PM
•  JBS's Batista Brothers Charged with Insider Trading by Brazilian Prose 10/12/2017 11:23 AM
•  American Beef Shipments to Japan Bypass Tariff Roadblock 10/12/2017 11:23 AM

## Corn College TV Education Series

Get nearly 8 hours of educational video with Farm Journal's top agronomists. Produced in the field and neatly organized by topic, from spring prep to post-harvest. Order now!

## Markets

Market Data provided by Barchart.com
 Cash Bids
 LDP Quotes
 ©2017 Farm Journal, Inc. All Rights 10901 W. 84th Terrace Suite 300 Lenexa, KS 66214
Close