43,560 square feet in an acre. A square or rectangular field, you take the Length X the Width to get square feet, then divide by 43,560.
Most farm supply stores sell measuring wheels. Some measure in Feet, some in "Wheels". One that measures in wheels is 6.6 feet around. This is a function of the square root of 43,560. Those that measure in wheels, you can multiply Wheels X Wheels, the move the decimal three places to the right and you have acres automatically, with no conversion. Odd shaped field, you break up into squares, right triangles or rectangle and use some Kentucky windage. The old surveyers "chain" was 66 feet long, but you had to drag it behind you.
The Garmin, Etrex ledgend GPS has an acreage measurement function under the accessories section. They are moderately accurate, run around $150.
Your county FSA office will also provide you with an aerial photograph with the acres shown for each field, as long as boundaries have not changed.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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