. 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 . larly those of the eastern and southern states, havecarried out experiments to determine the fertility needsof different soils and crops. Widely varying resultshave been obtained, chiefly for the reasons already out-lined. In a broad general way, the results in the east-ern states show that of the minerals, potash seems tobe needed especial
. 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 . larly those of the eastern and southern states, havecarried out experiments to determine the fertility needsof different soils and crops. Widely varying resultshave been obtained, chiefly for the reasons already out-lined. In a broad general way, the results in the east-ern states show that of the minerals, potash seems tobe needed especially for corn, while in the southernstates phosphoric acid is the chief constituent lacking,though upon lands naturally poor, the addition of allof the constituents is required, if maximum crops areobtained. FEEDING THE PLANT 105 Still, the results, broadly interpreted, show thatwith the exception of limited areas of special character,the lands of the east and south, which have been culti-vated for a long time, are benefited by the addition offertilizers, and in most instances all the constituentsare required. This is a safe assumption, where nospecific information derived from experiments is avail-able, because we have not yet attained maximum yields. Fig 28—Modern Corn Crib At Minnesota experiment station in these states under natural conditions. The experi-ments also show that it is a question of applied plantfood, not only, but also of its systematic and intelligentuse. The hit or miss system in the application offertilizers or manures is not a good one. Classification of Crops—It has also been clearlydemonstrated, in addition, that there is a proper rela-tion between the cost of the material applied and the 106 THE BOOK OF CORN value of the crop obtained, which must be observed inthe profitable use of materials. Crops are, in respectto fertilizers, divided into two general classes, first,those which possess a high fertility value and a lowcommercial value, and second, th
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