16. Farm on the Contour |
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With
contouring, you perform farming operations across the slope, following
the shape, or contour, of the land.
From the air, contouring presents dramatic patterns on the land.
But in terms of erosion control, the real drama takes place closer
to earth.
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The
small furrows and ridges that you create act like dams, trapping runoff
water, sediment, nutrients, and pesticides, and directing them along
graded crop rows to outlets such as grassed waterways or field borders. |
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The
results, some say, are reductions in soil erosion up to 50 percent
on gentle slopes when compared with up and down hill farming. On very
steep slopes, the erosion reduction will be less—possibly as
low as 10 percent. |
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Contouring
also offers possible savings in fuel and reduced wear and tear on
machinery and equipment. Some farmers report that it takes less power
to farm across the slope than up and down hills. |
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However,
tilling, planting, and harvesting fields along the contour become
increasingly difficult as the number of dips, draws, ridges, and elevation
changes increase. The number of point rows, short rows, and rows requiring
turning and doubling back also increases. To put it another way, contouring
is both a science and an art. |
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It
is inevitable that odd areas will develop where different contour
patterns meet, or in other areas. The two most common techniques for
dealing with odd areas are turnstrips. . . |
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. . or butt systems. |
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