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acid gas acre amount animals atoms bacteria body breeds butter butter fat called capillary capillary action carbonic acid carbonic acid gas cattle cell cent clods clover contains cotton cows crop cultivator dairy decay disease eggs Farm Management farmer feed fertilizers flowers food materials fruit fungi glass grass green manure grow grown growth hogs horses humus inches income insects irrigation keep kinds of plants labor land layer leaves legumes less lime limestone livestock loam manure milk mineral molecule muck soil mycelium nitrate nitrogen Office of Farm organic matter ovule oxygen pistil plant food plowing pollen potatoes pounds produce profitable purebred quantities quicklime rain rainfall regions rock particles root hairs rootstocks sandy soil scion shown in Figure slaked lime soil grains soil water soluble spores stems substances surface tile tillage U. S. D. A. Fig usually vegetable matter weeds wheat
Page 207 - Diagram indicating the nitrogen changes in the soil produced by the action of bacteria. The arrows indicate the course of the changes which various groups of bacteria may produce in the nitrogen compounds of the soil. A, action of ammonifying bacteria which change organic nitrogen to ammonia; B, action of nitrifying bacteria which change ammonia to nitrite; C, action of nitrifying bacteria which change nitrite to nitrate; D, assimilation of nitrate by green plants; K.
Page 159 - ... about on a par with most of the land used for tobacco in the neighborhood. FERTILIZERS FOR TOBACCO. The fertilizer experiments show that a soil which will yield, say, 900 pounds of tobacco to the acre from the use of the customary application of 400 pounds of 3-8-3 fertilizer (3 per cent of ammonia, 8 per cent of phosphoric acid, and 3 per cent of potash) costing $5, will generally yield as much as 1,400 pounds by using a much heavier application of a properly balanced fertilizer costing $30...
Page 5 - A molecule of pure limestone, or calcium carbonate, is composed of one atom of calcium, one of carbon, and three of oxygen.
Page 60 - We list below the ideas that we believe to be feasible, not in the order of their importance, but in the order in which they can be reduced to plan and action.
Page 296 - The stated objectives of many of the studies of the new machines or sources of power which have been carried on by the state experiment stations and the United States Department of Agriculture have been: To obtain and make available information that will enable farmers in the area to decide whether the new machine will be economical. (See statement of objectives for Project 20C.) This is a somewhat more restricted objective than those stated above and has usually led to a somewhat narrower...
Page 207 - IT, action of bacteria which change nitrogen gas Into proteid nitrogen ; /. action of bacteria which In symbiosis with leguminous plants change nitrogen gas Into proteid nitrogen ; K, action of bacteria which In symbiosis with certain nonlegumlnous plants change nitrogen gag into proteid nitrogen.
Page 212 - All that can be done here is to call attention to some of his most striking qualities. Foremost, of course, is the temper of the man. From the beginning he was sure of himself and sure of his mission; he had his purpose plain and clear. There is no mental development, hardly, visible in his work, only training, undertaken anxiously and prayerfully and with...
Page 87 - The value of this lime for agricultural purposes depends both on the character of the soil and the nature of the crop to be grown.