The Farmer of To-morrowMacmillan, 1913 - 308 páginas |
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acreage acres actually agriculture American farmer amount arid average bacteria Bureau of Soils bushels capital census cent chemical coal commercial fertilizers contains coöperation corn cost cow-peas crops cultivation culture Cyril G decade dollars an acre drainage drained East elements Europe fact factor farm land Farmer of To-morrow feed field fifty Gleaner grass hundred hypothesis Illinois inches increase industry Iowa irrigation Jeremiah labor legumes less Liebig manures means means of labor ments methods Middle West million acres mineral moisture nation Neighbor Jones nitrogen nominally in farms Oakville organic phosphoric acid phosphorus Plains plant food plow population potash potatoes pounds practice prairies present problem producing food rain rainfall reclaimed region River rotation salts scientists season seed silica soil fertility soil grains soluble solution sorghums square mile sufficient swamp theory thousand tion to-day United wheat yield
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Página 192 - ... more than satisfy the maximum needs of any crop, and that the nitrogen be applied in active forms, as nitrate of ammonia, and in such quantities and at such times as will insure the minimum loss of the element and the maximum development of the plant. Page 186. — Another system of fertilization is based upon the theory that the different plants should be provided with the essential elements in the proportions in which they exist in the plants, as shown by chemical analysis. Different formulas...
Página 192 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and thus the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements in the soil. It is, therefore, advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 191 - ... and if soils are in a high state of cultivation, or have been manured with natural products, as stable manure, they may be used singly to force a maximum growth of the crop. * * * "Another system which has been urged, notably by German scientists, is based upon the fact that the mineral constituents, phosphoric acid and potash, form fixed compounds in the soil, and are, therefore, not likely to be leached out, provided the land is continuously cropped. They remain in the soil until used by growing...
Página 93 - The market value of these lands in their present shape ranges from $2 to $20 per acre, depending upon the location and prospect of immediate drainage, with an average of probably $8 per acre. Similar lands in different sections of the country that have been drained sell readily at $60 to $100 per acre at the completion of the work, and in many instances, when situated near large cities, they have sold as high as $400 per acre. To determine whether or not it will pay to drain these lands we have but...