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Unformatted text preview: the tillage zone or furrow slice. Convention has accepted that the furrow slice of an acre weighs 2,000,000 lbs. It can be derived from the following assumptions: Density: Agriculture soils have a bulk density (or dry weight per unit volume) of 1.0 to 1.8 g/cm 3 . Most surface soils are near 1.2 g/cm 3 . Area: An acre is about 207 ft x 207 ft, or 39,805,752 cm 2 or x ha. Volume: If you plow 8 inches deep (20 cm), your acre furrow slice (one acre 8 inches deep) has a volume of 796,115,040 cm 3 . Weight: If you assume a bulk density of 1.2 g/cm 3 , the dry weight of your 796,115,040 cm 3 furrow slice is 955,338,040 grams. Since 1 lb. = 454 grams this equals 2,104,269 lbs., or about 2,000,000 lbs....
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- Spring '08