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Fertilizer spreaders application is only effective if you ensure uniform coverage. Dry fertilizers can be applied with either a drop (gravity) spreader or a rotary (centrifugal) fertilizer spreaders.

A drop type fertilizer spreaders have the advantage of applying fertilizer in a quite accurate pattern, but requires that each pass meets exactly with the previous one, otherwise skips will be noticeable. The rotary (or centrifugal) fertilizer spreaders on the other hand generally has a wider pattern of distribution than a drop spreader and thus can cover a larger area in a short time. The application pattern of the rotary fertilizer spreaders also gradually diminishes away from the machine, reducing the probability of the application skip. These fertilizer spreaders are harder to calibrate and application is less precise, however sufficiently accurate for most home fertilizations.

Handheld fertilizer spreaders, truck mount fertilizer spreaders, chest mountain fertilizer spreaders, tow-behind fertilizer spreaders and broadcaster fertilizer spreaders are some of the common types of fertilizer spreaders available in the market.

When talking about fertilizer spreaders, the concept of fertilizer spreaders calibration is worth mentioning. Fertilizer spreaders calibration involves measurement of the fertilizer output as the spreader is operated over a known area. One way to ensure uniform application of material is to divide the material into two equal portions. Use fertilizer spreaders calibration, which will deliver one-half the correct amount of material. Make an application over the entire area, turn the fertilizer spreaders direction ninety degrees (90°) from the initial application, and make a second application. This eliminates skips in the coverage.

Calibrating a drop-type (gravity) fertilizer spreaders involves the following steps:

-Check the fertilizer spreaders to be certain it functions properly.

-Measure the width of the fertilizer spreaders and the circumference of a wheel.

-Fill the fertilizer spreaders with the material you wish to apply (fertilizer, seed, etc). Fill the hopper only to the level you will have when the material will actually be applied.

-Make several short trial runs over the area and practice opening and closing the fertilizer spreaders. Do it gradually, not in a fast, jerky motion. Make sure the fertilizer spreaders drops the full length of the opening gate.

-Determine the weight of the fertilizer applied by the fertilizer spreaders. Some, but not all, commercial fertilizer spreaders come equipped with an attachable catch pan that fits under the fertilizer spreaders openings. When there is no catch pan this calibration requires two people. One person to hold the fertilizer spreaders and squeeze the lever and another person lift up one wheel and manually turns it 10 times. Collect the fertilizer that drops from the spreader openings on a large piece of paper. Then the fertilizer can be weighed and compared with the desired amount.

The same calibration procedure is used for fertilizer spreaders, seeds, or granular pesticide you want to apply. The quantity applied depends upon the physical properties of the material and the same settings cannot be used for different materials.