California, Utah, and the
Columbia Basin, as far as can now be learned, as well as the Great
Plains area, were all independent pioneers in the art of
dry-farming. It is a most significant fact that these diverse
localities, operating under different conditions as to soil and
climate, have developed practically the same system of dry-farming.
In all these places the best dry-farmers practice deep plowing
wherever the subsoil will permit it; fall plowing wherever the
climate will permit it; the sowing of fall grain wherever the
winters will permit it, and the clean summer fallow every other
year, or every third or fourth year. H. W. Campbell, who has been
the leading exponent of dry-farming in the Great Plains area, began
his work without the clean summer fallow as a part of his system,
but has long since adopted it for that section of the country. It is
scarcely to be believed that these practices, developed laboriously
through a long succession of years in widely separated localities,
do not rest upon correct scientific principles. In any case, the
accumulated experience of the dry-farmers in this country confirms
the doctrines of soil tillage for dry-farms laid down in the
preceding chapters.
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