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absorbed absorption acid phosphate acre active aeration agricultural alkali aluminum ammonia ammonium sulfate analysis average bacteria biological calcium calcium oxide capillary capillary water carbon dioxide cent Chem chemical clay loam colloidal composition compounds concentration considerable constituents Cornell decay decomposition deﬁnite determined drainage effect especially evaporation factors farm manure fertilizer ﬁeld ﬁgures ﬁlm ﬁne ﬁner ﬁrst green-manure heat higher plants hydrogen hygroscopic important increase inﬂuence ions Jour kaolinite land leaching legumes lime limestone loam loss lysimeters magnesium maize material method mineral moisture movement nitriﬁcation nitrogen nutrients occur oxide oxygen particles percentage phosphoric acid plowed pore space potash potassium pounds practical present production reaction residual rock rotation salts sand Seite silt loam sodium nitrate soil acidity soil organic matter Soil Sci soil solution soluble sulfate sulfur surface TABLE temperature texture tion U. S. Dept usually utilized
Page 95 - Specific gravity: The ratio of the weight of any volume of a substance to the weight of an equal volume of some other substance taken as the standard unit; relative density.
Page 431 - Murray, TJ, The Effect of Straw on the Biological Soil Processes; Soil Sci., Vol.
Page 447 - PRINCIPLES OF AGRICULTURAL CHEMISTRY, with special reference to the late researches made in England.
Page 199 - Studies in the relation of the non-available water of the soil to the hygroscopic coefficient.
Page 446 - The author advocates the use of saltpetre to increase the yield of crops, and says : "By the help of plain saltpetre, dilated in water and mingled with some other fit earthly substance, that may familiarize it a little with the corn into which I endeavored to introduce it, I have made the barrenest ground far outgo the richest, in giving a prodigiously plentiful harvest.
Page 286 - STEWART, GR EFFECT OF SEASON AND CROP GROWTH IN MODIFYING THE SOIL EXTRACT.
Page 84 - Studies of Scottish Drift Soil, Part I. The Composition of the Soil and of the Mineral Particles Which Compose It; Jour.
Page 267 - ... colloids were in equilibrium with the sea water. If the material were then formed into a shale and elevated to land areas the induration would presumably destroy the colloidal properties leaving the NaCl free from its colloidal entanglements and with the change of the solvent from sea water to rain Patten, HE, and Waggaman, WH, " Absorption by Soils,
Page 142 - Any material which allows a change of form without rupture and which will retain this form when the pressure is removed, is said to be plastic. Putty with a proper admixture of oil is a very good example of a plastic body. As is well known, various materials differ in plasticity.