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Planting, Seeding & Spraying EquipmentCalibration Tools Every Farm Needs
You do not need much to calibrate farm equipment well. A small kit of simple tools lets you check sprayers, spreaders and seeders before they waste product.
Key points
- A small, cheap kit lets you measure what your equipment really does.
- Sprayers need timed catch containers, tape and a speed course; spreaders and seeders need scales and catch pans.
- Check the tools themselves for accuracy before trusting them.
- Calibrate every season and after any change in nozzles, speed, seed or material.
- Record results and ask your extension office for worksheets and help.
Why do you need calibration tools?
Sprayers, spreaders and seeders all put out a rate that drifts over time. Nozzles wear, chains stretch, seed changes and gauges lie. The only way to know what your machine is doing is to measure it.
Product labels set the rates for chemicals, and soil tests and extension advice set fertilizer and seed rates. Your tools let you match what the machine does to what the label or the recommendation says.
Think of calibration as a habit, not a chore. A few minutes with a jug and a stopwatch costs far less than a field of uneven stand or a double dose on part of a pasture.
What basic tools belong in a calibration kit?
A good kit is cheap and fits in a toolbox or a bucket. Keep it together so you can find it before the season starts.
Label the container and keep a copy of the calibration worksheets from your extension office inside.
- Stopwatch or phone timer
- Measuring tape and a long tape or wheel for distances
- Marking flags or cones
- Graduated jugs or collection containers
- Bathroom or hanging scale and a bucket
- Calculator, notebook and pen
- Tarps or pans for catching spread material
What tools are best for sprayers?
For a sprayer, you need a way to catch output from nozzles for a timed run, such as a graduated jar or a flow meter made for the job. Many extension offices sell or lend nozzle flow testers. You also need a tape measure for nozzle spacing and a marked course for checking speed.
A spare pressure gauge helps you check the one on the machine. Water-sensitive paper shows coverage on the target. Use clean water for calibration, and wear gloves and eye protection when working with nozzles that may hold residue.
Practice the catch method on the shop floor with clean water before you do it in the field. Wind and bumpy ground make the first attempts messy, and a calm run-through teaches you the steps.
What tools suit spreaders and seeders?
For dry spreaders, catch pans or tarps, a scale and a tape measure let you weigh what lands over a known area. For drills and planters, you can turn the drive for a set number of revolutions and catch seed in a container, then weigh it. A kitchen or hanging scale with good resolution works for small seed.
Keep clean buckets and a sealed container for each material. Do not use food containers for fertilizer or treated seed.
How do you check your tools?
Tools that measure wrong ruin the results. Weigh a known object on your scale, check your tape against a second tape and confirm that jugs are marked correctly by pouring in water measured with another container. Replace anything that does not agree.
Store the kit dry and clean, and replace cracked jugs and worn tapes. A scale left in a hot truck or damp shed can drift, so check it again each season.
How often should you calibrate?
Calibrate at the start of each season, whenever you change nozzles, speed, seed, material or settings, and whenever you suspect a problem. Check mid-season on long jobs. A 30-acre hay field sprayer with new tips needs a fresh test. So does a seeder moving from one seed lot to another.
Write each result in your record book with the date and conditions. Over time, your notes show how fast parts wear and when to replace them.
Share the kit with neighbors if you like, but agree on who keeps it and who cleans it. A kit that goes missing in the middle of the season helps no one.
When should you get help?
If results will not repeat, or if numbers are far from what the manual suggests, a worn pump, meter or gearbox may be the cause. A dealer service department or qualified mechanic can diagnose it. Your extension office can supply calibration worksheets and sometimes lend equipment.
Sources and further reading
- University of Nebraska-Lincoln Extension
- Kansas State University Research and Extension
- Purdue Extension
- American Society of Agricultural and Biological Engineers (ASABE)
Organization homepages are linked so you can search them for current guidance on this topic.