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).
2. 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.)
5. 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.
Publications
News
Harvest for two of the state’s most significant row crops is well underway, with soybeans and cotton both ahead of schedule.
As of Oct. 6, 2024, the U.S. Department of Agriculture estimated that cotton was 43% harvested, ahead of the five-year average of 31% complete by this date. Soybeans were 76% harvested, where typically the crop is just 60% harvested.
This summer has not just felt hot and dry; close to half the state is in moderate to severe drought, and temperatures have been mostly in the 90s through all of August.
Mike Brown is the state climatologist and Mississippi State University professor of meteorology. He said much of the northern two-thirds of the state has been fluctuating between drought and being OK.
