Bulletin, Volumes 81-90U.S. Government Printing Office, 1912 - Soil science |
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acetate Agriculture alcohol amount areas arginine arid asparagine beneficial Bureau of Soils carbonate catalytic power cent Chem chemical clay loam color compounds concentrated containing no nitrate County creatine creatinine creatinine zinc chloride culture solutions cultures containing decomposition deposits effect Elkton epidote extract fertilizer Field Operations filtered filtrate formation formed geological grams green weight guanidine Hagerstown heating histidine hornblende humus hydrogen hydroxide hypoxanthine inches increase leaching lime limestone manure material method microcline milligrams million of NH mineral moisture nitrogen nucleic acid obtained occur organic matter orthoclase oxidation particles percentage phosphate phosphoric acid plant growth PLATE potash potassium Prairie soils precipitate present protein quantity quartz regions rock salts samples sand sandy loam Sassafras shales shown sodium sodium hydroxide soil constituents Soil Survey soluble specific gravity subsoils surface soils TABLE texture tion U. S. Dept Volusia silt loam Water culture wheat zinc chloride
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Page 28 - ... result of interaction between inorganic constituents and certain types of organic matter. It may also be brought about by organic matter in a state of autoxidation and by inorganic oxygen carriers, such as manganese and iron. Both processes activate oxygen." According to Sullivan and Reid (1912:28), " That the catalytic power of the soil is correlated to some degree with the manganese content of the soil is evident.
Page 33 - No. 70. The culture solutions were changed every three days, four changes being made in the course of the experiment. The solutions were analyzed for nitrates immediately after each change. The phosphate and potassium were determined on a composite solution of the four changes. Observations on the general development of the plants and the effect on root growth and appearance were made during the experiment and photographs were taken.
Page 33 - ... nitrate and calcium acid phosphate, sodium nitrate and potassium sulphate, and calcium acid phosphate and potassium sulphate. Still other solutions had all three constituents in various proportions. The concentration of all the solutions was 80 parts per million of the fertilizer ingredients, P2O5, NH3 and K2O.
Page 15 - If a soil be liberally supplied with all these units, it is conceivable that good plant growth will result, even without nitrate. If only a limited amount or kind of the units be present, the plant must have...
Page 16 - ADDITIONAL COPIES OF THIS PUBLICATION- MAY BE PROCURED FROM THE SUPERINTENDENT OF DOCUMENTS GOVERNMENT PRINTING OFFICE •WASHINGTON", DC AT 15 CENTS PER COPY V NURSE TRAINING SCHOOLS, 1917-18.
Page 3 - Respectfully MILTON WHITNEY, Chief of Bureau . Hon. JAMES WILSON, Secretary of Agriculture. CONTENTS. Page.
Page 7 - Most of the mines are reached by the Louisville & Nashville and the Nashville, Chattanooga & St. Louis Railroads, but several of the deposits being worked in Hickman and Davidson Counties are several miles from the railroads.
Page 32 - ... the area over which the phosphate deposits of northern Arkansas occur nothing but sedimentary rock is exposed at the surface. The ages, relations, and names of the formations in the eastern part of the area are given in the following section: General section in phosphate region of northern Arkansas. Carboniferous: Boone chert, including St. Joe marble. Devonian: Chattanooga shale and Sylamore sandstone. Silurian: St. Glair limestone.
Page 33 - The effect of salicylic aldehyde on wheat plants was further studied by growing the seedlings in nutrient culture solutions containing the ordinary fertilizer salts, calcium acid phosphate, sodium nitrate, and potassium sulphate. Some of the cultures contained calcium acid phosphate only, some sodium nitrate only, and some potassium sulphate only. Other solutions were composed of mixtures of two salts, calcium acid phosphate and sodium nitrate, calcium acid phosphate and potassium sulphate, and sodium...
Page 34 - There remains to be discussed the effect of hypoxanthine on the removal of nutrients from the solution during the growth of the plant. Mention has already been made of the fact that the concentration differences produced by the growth of the plants in the various cultures was determined by making an analysis for nitrate at the termination of every three-day change, and of the phosphate and potassium on a composite of the solutions from the four changes. It is thus possible to compare the results...