Environmental Engineering Reference
In-Depth Information
Fig. A.2. Rotary-type spreader.
4. Mark off a test distance that, when multiplied by the effective width,
equals 100 m
2
. For example, an effective width of 3 mmultiplied by a
distance of 33.3 m yields an area of about 100 m
2
.
5. Fill the hopper with a known weight of fertilizer and adjust the
spreader to the lowest setting that will allow the material to flow.
Push the spreader along the calculated test distance, opening the
hopper at the starting line and closing it at the finish. Weigh the
material left in the spreader and subtract the result from the starting
weight. The difference is the amount applied per 100 m
2
at that
spreader setting.
6. Repeat step 5 at successively higher settings (greater openings) and
record the amount of material applied at each setting.
7.
Select the spreader setting that most closely approximates the desired
rate of application, and set the spreader accordingly. To obtain uni-
form spread of material, remember to set the spreader at half the
