Moreover, his farm paper of 1896, containing a full
statement of the "Campbell method," makes absolutely no mention of
"summer tillage," which is now the very keystone of the system.
These and other facts make it evident that Mr. Campbell has very
properly modified his methods to harmonize with the best experience,
but also invalidate the claim that he is the author of the dry-farm
system. A weakness of the "Campbell system" is the continual
insistence upon the use of the subsurface packer. As has already
been shown, subsurface packing is of questionable value for
successful crop production, and if valuable, the results may be much
more easily and successfully obtained by the use of the disk and
harrow and other similar implements now on the market. Perhaps the
one great weakness in the work of Campbell is that he has not
explained the principles underlying his practices. His publications
only hint at the reasons. H. W. Campbell, however, has done much to
popularize the subject of dry-farming and to prepare the way for
others. His persistence in his work of gathering facts, writing, and
speaking has done much to awaken interest in dry-farming.
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