Comparative behavior of ammonia and ammonium salts in soils
A. D. Ayers
J. S. Hosking
Authors AffiliationsH. Jenny was Professor of Soil Chemistry and Morphology and Soil Chemist and Morphologist in the Experiment Station; A. D. Ayers was Graduate student, University of California, 1936 to 1938; J. S. Hosking was Graduate student, University of California, 1938 to 1940.
Hilgardia 16(9):427-457. DOI:10.3733/hilg.v16n09p427. April 1945.
Abstract does not appear. First page follows.
Some years ago anhydrous ammonia (NH3) was introduced in California as a nitrogen fertilizer. This compound, sold as “Agricultural Ammonia” and “Shell NH3,” is available in the form of a liquefied gas compressed in strong steel cylinders that weigh about 150 pounds.
Agricultural Ammonia is applied on the land during irrigation. The cylinders are connected to a simple metering device, and the ammonia is released as a gas into the irrigation water. Thus the ammonia is distributed in a very dilute solution (100 to 500 p. p.m.). In water ammonia (NH3) forms ammonium hydroxide (NH4OH).
Every new method of fertilization unfolds problems for investigation. The mere fact that a new type of fertilizer initially produces good economic returns is no guarantee of lasting efficiency. Since the continued use of a given fertilizer may deteriorate the chemical and physical properties of a soil and impair the crop yields, it is, therefore, of utmost importance to acquire a clear understanding of the reactions that take place and the resulting changes in soil properties.
In this paper are discussed certain fundamental problems of ammonia fertilization, especially those phases that require laboratory investigation. For the purpose of comparison with commonly used nitrogenous fertilizers, all experiments with ammonia (NH3) were accompanied by corresponding experiments with ammonium sulfate [(NH4)2SO4] or ammonium chloride (NH4Cl). The various topics investigated may be conveniently grouped as follows: (1) the extent and chemical nature of ammonia fixation in soils; (2) the availability of ammonia in soils to plants and microörganisms; (3) the influence of ammonia on physical soil characteristics, especially permeability.
Fixation of Ammonium Compounds in Soils
Experimental Procedure.—To 50-gram portions of air-dry soil were added electrolyte solutions containing 2 to 500 milliequivalents of NH4OH or (NH4)2SO4. All systems were brought to a volume of 1 liter. The suspensions were kept at room temperature for 24 hours and were shaken occasionally. Samples of clear supernatant liquid were obtained by centrifuging or by means of Pasteur-Chamberland filters. According to special tests, no NH3 was lost under the experimental conditions. The NH3 was determined by distillation with MgO into standard acid, using methyl red as an indicator.
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