. The book of corn; a complete treatise upon the culture, marketing and uses of maize in America and elsewhere, for farmers, dealers, manufacturers and others--a comprehensive manual upon the production, sale, use and commerce of the world's greatest crop . st of such treat-ment cannot properly be chargedto the single crop following. Theusual method of maintaining fer-tility is by devoting the landoccasionally to some renovatingcrop, like clover, and when thisis done it is obvious that someallowance must be made for theless valuable product of the landin that year, but what that allowance shou
. The book of corn; a complete treatise upon the culture, marketing and uses of maize in America and elsewhere, for farmers, dealers, manufacturers and others--a comprehensive manual upon the production, sale, use and commerce of the world's greatest crop . st of such treat-ment cannot properly be chargedto the single crop following. Theusual method of maintaining fer-tility is by devoting the landoccasionally to some renovatingcrop, like clover, and when thisis done it is obvious that someallowance must be made for theless valuable product of the landin that year, but what that allowance should be cannotbe determined with accuracy. In this investigation no allowance has been made W Fig 90—Ear of Corn Riddied by the Grain Moth (After Riley) COST OF GROWING CORN 3H for fertility directly applied, and in such cases the fullcost has been charged to the crop in question. Thiscourse undoubtedly makes the charge allowed for fer-tilization higher than it actually averages, but no othercourse seems open without the introduction of personalestimate into a calculation which is intended to be anactual record. In the schedules fertilization was re-ported on some parts of 1639 acres, requiring 63534days of labor and 483^ days of team service. There. Fig 91—Saw=toothed Grain Beetle Silvanxs surina7iiensis: a, adult beetle; b, pupa; c, larva—all enlargedj ^an-tenna of larva—still more enlarged (after Chittenden) were used 9100 pounds of commercial fertilizer, cost-ing $, and 5977 loads of homemade material, val-ued at $ Planting—Planting methods included the wholerange from hand dropping and hoe covering to the useof hand planters, and up through machines of varyingefficiency to the best modern horse planters. As aresult the efficiency of a days labor varies widely,from .71 of an acre in New Hampshire to acresin Nebraska. The acreage regularly planted was 3491 312 THE BOOK OF CORN acres, requiring- 442^4 days of labor and 375)4 days ofteam service, an
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