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Can you tell me about sprayer calibration?

1. For a broadcast boom - measure the distance between nozzles. Measure it, don't guess. For a band, either on a planter or on a cultivator, measure the width of the area sprayed (band).

Hooded Sprayer2. Determine the length, in feet, of a 1/128 acre plot for the measured nozzle spacing or band width. This will be the distance to time the tractor.

3. To do this use the following formula: 43,560 (square feet per acre) / divided by nozzle spacing or band width in feet / divided by 128. * Example - 19 inch band on a cultivator 19 / 12 = 1.583333 feet (band width in feet) 43,560 (sq.ft./ac) / 1.583333 = 27511.584 27511.584 / 128 (ounces in a gallon) = 214.934 (215) feet to time the tractor.

4. Determine the time in seconds for the tractor to travel 215 feet. (Remember to determine the time to travel the distance under the condition of operation, i.e. with the cultivator down, etc.)

Highboy5. With the pressure set and the sprayer spraying, catch water from all tips spraying the band (or one tip on a broadcast boom) for the exact same time it took to travel the prescribed distance and measure it in ounces. * Lets say it took 25 seconds and you caught 10 ounces. You are putting out 10 gallons of volume per treated acre.

6. Determine the tank capacity and divide by the volume per treated acre. * Example: 300 gallon tank capacity and 10 gallons per treated acre = 30 acre per tank load. This tells you that the sprayer will treat 30 acres. Don't worry about how many acres the tractor will drive over - it will treat 30 acres.

7. Determine the broadcast rate of the product, or products in question and add enough to the tank to treat 30 acres on a broadcast basis. The tractor will treat 30 treated acres and don't worry how many planted acres it runs over.

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News

Close-up of a cotton plant.
Filed Under: Agriculture, Cotton August 30, 2021

STARKVILLE, Miss. -- When the calendar turns to September, many who call Mississippi home long for cooler temperatures to relieve the summer’s heat, but the state’s cotton growers want high temperatures and dry weather to drag into October.

Water stands in a corn field
Filed Under: Crops, Corn, Cotton, Soybeans, Disaster Response June 24, 2021

STARKVILLE, Miss. -- MSU Extension agents will be assessing agricultural damage from early-June flooding until well into July, but preliminary estimates indicate losses could break records.

The 2019 Yazoo Backwater Area flood caused $617 million in crop damage alone. It looks like the more recent flood will exceed those losses.

Heavy rainfall, primarily north of U.S. Highway 82, throughout the second week of June waterlogged crops during critical growth stages. Flooding caused complete or partial losses in many fields.

 A man in a hat kneels among straw to point at tiny plants.
Filed Under: Crops, Corn, Cotton, Rice, Soybeans May 20, 2021

Because it is the first crop planted starting in March, Mississippi corn is in much better shape than other row crops struggling with the challenges of wet, cool weather.

Graphic showing 2021 planting intentions
Filed Under: Agriculture, Corn, Cotton, Rice, Soybeans April 1, 2021

STARKVILLE, Miss. -- Mississippi row crop growers are planning to plant more soybeans and corn in 2021 than they did last year but not as much cotton, rice or hay.

The National Agricultural Statistics Service, a branch of the U.S. Department of Agriculture, publishes its planting intentions report each year at the end of March. This report provides a state-by-state estimation of how many acres of corn, soybeans, wheat and cotton farmers will plant in the upcoming growing season.

Filed Under: Agriculture, Corn, Cotton, Grains, Rice, Soybeans, Sweet Potatoes, Agri-tourism, Beekeeping, Equine, Goats and Sheep, Poultry, Swine, Turfgrass and Lawn Management, Vegetable Gardens, Forestry February 2, 2021

STARKVILLE, Miss. -- Each February marks the occasion for producers to share their research and programming needs with Mississippi State University agricultural specialists in person.

To comply with COVID-19 social distancing guidelines, the opportunity will be extended virtually this year.

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Portrait of Dr. Darrin Dodds
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Cotton Agronomics
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