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193

Chapter 4.6

Figure 4.6.2 Sample Layout Pattern for Sheets or Pans

Determine the total collection area by multiplying length by width of each sheet or pans and then multiplying by the number of sheets or pans that will be used during the calibration. If the intention is to weigh manure directly on sheets or pans, pre-weigh the sheets or pans and record the empty or clean weight (i.e., tare weight) of each. Record the total collection area and the tare weight for each collection sheet or pan.

Secure Collection Sheets or Pans 2.

Lay out collection sheets or pans in the desired pattern, across the equivalent of two spreader widths. If using several sheets, space them evenly or secure them side-by-side. Stretch sheets out to remove any wrinkles and secure to the ground using pegs or some other method. This will prevent them from being moved by wind or wheel pressure from the equipment passing over.

Since pans can be easily crushed by equipment, space the pans to allow space for equipment tires to pass in between. Marking out the spreader’s path can help prevent collection pans from being crushed.

Make a First Pass with the Spreader 3.

Perform a single pass with the spreader directly through the middle of the test area. Begin spreading prior to

reaching the test area to ensure the spreader is fully functional while passing over the collection pans or sheets.

Weigh Manure Collected 4.

Weigh the manure collected either by directly weighing the sheet or pan with manure or by transferring the manure to a container that is easier to handle. Containers, such as a large plastic garbage can for solid manure, or a pail for liquid manure can be used for this purpose. Remember to weigh and record the weight of the container prior to beginning to establish a tare weight that can be subtracted from the gross weight. If using a single collection sheet, weigh the manure collected in each marked off section.

Use a scale that is appropriate for the specific situation. If using small sheets or pans to collect solid or liquid manure, either a kitchen (for less than 2 kg or 5 lb) or bathroom scale (up to 25 kg or 50 lb) is suitable. If collecting solid manure on larger sheets, a spring-tension scale or milk scale (more than 25 kg or 50 lb) might be more appropriate.

Remember that the weight that registers on the scale is the total weight of the manure plus the container. Subtract the tare weight of the sheet, pan or container to get the net weight of manure collected. Record the net weight of manure collected.

Calculate Application Rate 5.

To calculate application rate in kg/m 2 (or lb/ft 2 ), divide the total net weight of manure collected in kg (or lb) by the area of the sheet(s) or pans in m 2 (or ft 2 ). To convert this rate to t/ha (or tn/ac) use the conversions below:

Application rate (t/ha) = Application rate (kg/m 2 ) × 10 Application rate (tn/ac) = Application rate (lb/ft 2 ) × 21.78

Take special care to avoid spilling manure as this can affect the calibration considerably.

s i d e b a r

Page 199 - Nutrient Management Planning Guide

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