Bulletin, Volúmenes17-30U.S. Government Printing Office, 1901 |
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alkali amounts of water-soluble analysis aqueous August August 24 Average bicarbonates bulk Bureau of Soils bushels calcium carbonate calcium sulphate capillary capillary action carbon dioxide carbonic acid Cecil clay cent centimeters Chem clay loam concentration containing corn cotton crop cubic depth determined dissolved distilled water dry soil electrolytes evaporation experiments fermentation fertilizers field filter Fourth foot given Goldsboro grown gypsum Hagerstown hydrate hydrogen carbonate inches increase investigation July July 25 June June 24 land leaf magnesium method million of dry mineral Norfolk sandy soil normal carbonate obtained organic matter phosphoric acid potash potassium pressure samples sand Second foot seed Selma silt loam September silicates sodium carbonate sodium chloride soil solution soil types solu soluble soluble salts subsoil substances surface 4 feet Takoma soil temperature Third foot tion titration tobacco tons manure transpiration tube water-soluble salts recovered weight wheat yield
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Página 26 - Water containing the slimy fibrils of fungoid and moss prothallia, vorticellae, etc., will not only cause errors by obstructing the stopcock at low velocities ; but these organisms will cause a coalescence of sediments that defies any ordinary churning, and completely vitiates the operation. 4. The amount of sediment discharged at any one time must not exceed that producing a moderate turbidity. Whenever the discharge becomes so copious as to render the moving column opaque, the sediments assume...
Página 46 - ... have been able to analyse several hundred soils of the behaviour of which in the field something was known. From these results the authors come to the conclusion " that with occasional exceptions the composition of the soil solution and the concentration is about the same in all cultivable soils.
Página 18 - To an increase in the tension of the liquid-solid surface as the concentration is increased. (5) Sodium carbonate differs from neutral salts, the capillary rise being considerably greater than for neutral solutions of equal concentration. (6) This may be due in part to the saponification of traces of grease on the surface of the soil grains through the hydrolysis of the sodium carbonate, thus furnishing clean surfaces for capillary action. (7) The same effect should consequently be observed with...
Página 46 - Apparently, therefore, all these soils are amply supplied with the necessary mineral plant foods and these plant foods are not in themselves a matter of such paramount importance to the agriculturist, for their supply as regards the plant is determined by the supply of soil moisture which the crop can obtain from the soil.
Página 21 - When the midribs are thoroughly cured the leaves are iXMury to be taken to the packing house. To get the tobacco in condition to handle, all the ventilators should be left open for one night, opening them about 6 o'clock in the evening. The next morning the tobacco should be in what is called "good case;" that is, it will have taken up sufficient moisture to become soft and pliable.
Página 1 - Respectfully, MILTON WHITNEY, Chief of Bureau. Hon. JAMES WILSON, Secretary of Agriculture. 3 CONTENTS. Page. Introduction 7 The centrifugal method of mechanical soil analysis...
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Página 16 - Very litle of the type is for sale, but prices generally quoted range from $60 to $100 an acre. The following table gives the results of mechanical analyses of samples of the soil and subsoil of this type : Mechanical Analyses of Holston Silt Loam.
Página 11 - ... included among our mineral resources, and certainly no one of these mineral resources can be compared with them in importance and interest to every citizen of the state. A general discussion of the soils, from the point of view of their geological relations seems, therefore, to be called for here. Since the soils have been derived from the disintegration and decay of the older rocks, a geological map might, to a certain extent, serve also as a soil map, but these products of decomposition now...
Página 64 - It is a well recognized fact that next to temperature, the water supply is the most influential factor in the product of a crop. Poor soils give good crops in season of plentiful and well distributed rain or when skilfully irrigated, but insufficient moisture in the soil is an evil that no supplies of plant-food can neutralize.