
Fertilizer spreaders are used to apply dry granular materials such as fertilizer, pesticides, lime, or seed. There are two types of spreaders: rotary spreaders and drop spreaders. It is important to pan test a fertilizer spreader to ensure uniform and accurate applications of fertilizer. The pan test involves marking out a path, attaching a catch pan, pouring fertilizer into the spreader, walking the path, weighing the fertilizer, and adjusting the settings. This process helps to determine the correct amount of fertilizer to be applied and prevents under or over-application, which can lead to economic losses.
| Characteristics | Values |
|---|---|
| Purpose | To ensure uniform and accurate applications of fertilizer, lime, and other soil amendments |
| Calibration | Required before each fertilizer application to ensure nutrients are used economically |
| Calibration methods | Pan test, rotary spreaders, drop spreaders |
| Materials | Catch pan, scale, tape measure, shallow cake pans or disposable aluminum trays |
| Procedure | Measure swath width, attach catch pan, pour fertilizer, adjust spreader settings, walk the path, weigh fertilizer, adjust settings as needed, repeat |
| Considerations | Working width, spreader gate, flow, spinner vane settings, material distribution, application rate |
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What You'll Learn

Mark out a path
Marking out a path is an important step in pan-testing a fertilizer spreader. This process ensures that you are using the correct amount of fertilizer over a certain area.
First, you need to determine how much fertilizer you want to use over a given area. For example, if you want to use fertilizer over 100 sq. ft, and your spreader is 24 inches wide, then you need to mark a path that is two feet wide and 50 feet long.
You can mark this path on a turf area that is not in use or on a paved area. Use chalk or flags to indicate the start and end points of the strip. If you are marking the path on a paved area, be sure to sweep up the fertilizer after your test.
Once you have marked the path, you can continue with the next steps of the pan test, which include attaching the catch pan to the spreader, pouring the fertilizer into the hopper, and adjusting the spreader settings.
It is important to note that the path you mark out may vary depending on the specific fertilizer spreader you are using and the area you want to cover. Always refer to the operator's manual for guidance on the specific settings and application rates for your fertilizer spreader.
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Prepare your catch pan
To prepare your catch pan, you'll need to gather the right materials and equipment. Firstly, you will need a catch pan. If your spreader model does not include one, you can use the calibration method for rotary spreaders, which involves spreading the product on turf or pavement and calculating the amount applied by subtracting the remaining product in the spreader from the amount you started with. If you are using a catch pan, it should be a trough that can be mounted underneath the spreader hopper to collect the granular product. You will also need a scale that can accurately weigh small amounts.
Once you have your catch pan and scale, you will need to measure the swath width of your spreader, which is the distance between the wheels. This will help you determine the path you will need to walk during the test. If your spreader is 24 inches wide, for example, you will need a path that is two feet wide and 50 feet long. Mark out this path on a turf area that is not in use, or on a paved area if no turf is available. Use chalk or flags to indicate the starting and ending points of your strip.
Now you can attach the catch pan to the spreader. If your spreader does not have a catch pan, weigh out 5 to 10 pounds of product, or enough to complete the test run with some left over, and record this weight. You will then pour this product into the hopper with the hopper-opening lever in the closed position. Adjust the spreader setting to the recommended rate on the product label, if available.
After you have completed your test run, you will need to remove the catch pan from the hopper and pour the product into a bucket to be weighed. If you did not use a catch pan, pour the remaining product in the spreader into the bucket and weigh it, subtracting the weight of the bucket. Now you can calculate if the amount of product used matches the rate you want to apply to the turf. For example, if you want to apply a 30-0-10 fertilizer at a rate of 1 pound of nitrogen per 1,000 square feet, you will need to make two coverage passes, each delivering half the desired rate (0.5 pounds N per 1,000 square feet).
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Measure a test strip
To measure a test strip, you'll need to follow a few steps to ensure accuracy. Firstly, you'll need to gather the necessary materials: a catch pan, a scale, and your fertilizer or pesticide product. The catch pan is important as it collects the granular product when you make a pass with the hopper holes open. If your spreader model doesn't include a catch pan, you can use the calibration method for rotary spreaders, which involves spreading the product onto the test strip and calculating the amount applied by subtracting the remaining product from the initial amount.
Next, you'll need to measure the swath width of your spreader, which is the distance between the wheels. This is an important step as it impacts the amount of product you'll need to apply. After measuring the swath width, you can move on to measuring the test strip itself. Measure a 50- or 100-foot strip in an area that won't be affected by the product application, such as an unused turf or paved area. Use chalk or flags to clearly mark the starting and ending points of the strip.
Now, you'll need to prepare your spreader. Attach the catch pan to the spreader if you're using one. Close the hopper-opening lever and pour the product into the hopper. Adjust the spreader setting according to the product label's recommendations for the desired application rate. Position the spreader a few feet before the starting line and begin walking at a comfortable, brisk pace.
If you're using a catch pan, remove it from the hopper after completing the strip and pour the product into a bucket to be weighed. If you didn't use a catch pan, pour the remaining product in the spreader into a bucket and weigh it, subtracting the weight of the bucket. This weight will help you determine if the amount of product collected matches the desired application rate. For example, if you want to apply 2.5 pounds of fertilizer per 1,000 square feet, you can use the formula: weight of fertilizer per 1,000 square feet x (swath width x length of strip) / 1,000 square feet = weight of fertilizer needed.
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Weigh the fertiliser
Weighing the fertiliser is a crucial step in calibrating your fertiliser spreader. This process ensures that you are applying the correct amount of fertiliser to your lawn or turf area. Here is a detailed guide to help you through the process:
Firstly, it is important to gather the necessary materials for this step. You will need a scale that can accurately weigh small amounts of fertiliser. Even a small calibration error can lead to disproportionate results when treating large areas of turf. You may also require a bucket or container that has been tared or weighed beforehand so that only the weight of the fertiliser is measured.
If you have used a catch pan during your test run, remove it from the hopper and pour the fertiliser into your bucket. Weigh this amount, remembering to subtract the weight of the bucket if it hasn't been tared. If you did not use a catch pan, pour the remaining fertiliser in the spreader into the bucket and weigh it.
Now, calculate the difference between the weight of fertiliser you started with and the weight of the fertiliser remaining after your test run. This will give you the amount of fertiliser your spreader has applied over a certain area, typically 100 sq. ft. This calculation will help you determine if your spreader is applying too much or too little fertiliser.
The weight of the fertiliser used is crucial in determining the application rate of your spreader. You can use the formula: (Pan Contents (grams) / Pan Area (square feet)) x 96 = Application Rate (pounds per acre). This calculation will guide you in adjusting your spreader settings to achieve the desired application rate.
By following these steps and weighing the fertiliser accurately, you can ensure that your fertiliser spreader is calibrated correctly. This calibration process will help you avoid under or over-application of fertiliser, leading to a healthier lawn and more efficient use of resources.
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Adjust settings
Adjusting the settings of your fertilizer spreader is a crucial step in ensuring uniform and accurate fertilizer distribution. Here's a detailed guide on how to adjust the settings of your fertilizer spreader:
Determining the Application Rate
Before making any adjustments, it is essential to determine the desired application rate, which is typically measured in pounds per acre. This value can be calculated using the formula:
Pan Contents (grams) / Pan Area (square feet)) x 96 = Application Rate (pounds per acre)
Adjusting the Settings:
Once you have determined the desired application rate, you can adjust the settings on your fertilizer spreader accordingly. This process may vary slightly depending on the make and model of your spreader, so it is always a good idea to refer to your operator's manual for specific instructions.
Firstly, locate the setting knob or lever on your fertilizer spreader. This is typically found near the handle and is used to adjust the size of the holes at the bottom of the bucket, thereby controlling the amount of fertilizer released.
If your fertilizer has a recommended setting, start by adjusting the spreader to this setting. This information can usually be found on the product label. If no setting is recommended, start with a middle setting as a baseline for further adjustments.
Test Application:
After adjusting to the recommended or middle setting, it's time for a test application. Position your spreader a few feet before the starting line of your marked path and begin walking at a comfortable, brisk pace. Ensure the hopper-opening lever is in the open position to allow the fertilizer to be released.
Weigh the Results:
Following the test application, it's necessary to weigh the amount of fertilizer used. If you are using a catch pan, remove it from the hopper and pour the fertilizer into a bucket to weigh it. Alternatively, if you didn't use a catch pan, weigh the remaining fertilizer in the spreader, subtracting the weight of the bucket or container.
Compare and Adjust:
Now, compare the weight of fertilizer used in your test application with the desired application rate. If you used more or less than the recommended amount, you will need to adjust the setting on your spreader accordingly. For example, if you used less fertilizer than desired, you should adjust the setting to increase the application rate, and vice versa.
Repeat the above steps as needed until you find the right setting that achieves the desired application rate. It may take a few iterations to fine-tune your spreader, but this process ensures accurate and efficient fertilizer distribution.
Remember to consult your operator's manual for additional tips and guidelines specific to your fertilizer spread model.
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Frequently asked questions
Pan testing a fertilizer spreader is important because it helps you determine if you are spreading fertilizer accurately and uniformly. This prevents under or over-application of fertilizer, which can create economic losses.
You will need a catch pan, a scale, a tape measure, and fertilizer. The catch pan is used to collect the fertilizer, the scale is used to weigh the fertilizer, and the tape measure is used to measure the distance between the wheels of the spreader.
First, measure the swath width of your spreader (distance between the wheels). Then, attach the catch pan to the spreader. Make sure the hopper-opening lever is in the closed position before pouring the fertilizer into the hopper. Adjust the spreader setting to the recommended rate on the product label.
Position the spreader a few feet before the starting line and begin walking at a comfortable pace. If you are using a catch pan, remove it from the hopper after the test run and pour the fertilizer into a bucket to be weighed. If you are not using a catch pan, pour the remaining fertilizer in the spreader into a bucket and weigh it, subtracting the weight of the bucket.
Use the formula: (Pan Contents (grams) / Pan Area (square feet)) x 96 = Application Rate (pounds per acre). If the application rate is not what you desired, adjust your fertilizer spreader settings accordingly. Repeat the pan test until you achieve the desired application rate.











































