Journal ArticleDOI
Nitrogen Mineralization Potentials of Soils
George Stanford,S. J. Smith +1 more
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In this paper, a 30-week period at 35C, using incubation intervals of 2, 2, 4, 6, 8, and 8 weeks, was used to determine the net mineralization of 39 widely differing soils.Abstract:
Net mineralization of N in 39 widely differing soils was determined over a 30-week period at 35C, using incubation intervals of 2, 2, 4, 4, 4, 6, and 8 weeks. Mineral N was leached from the soils before the first incubation and following each of seven incubations by means of 0.01M CaCl₂ and a minus-N nutrient solution. Soil water contents were adjusted by applying suction (60 cm Hg), and losses of water during incubation under aerobic conditions were negligible. With most soils, cumulative net N mineralized was linearly related to the square root of time, t½. The pH of soils changed very little in the course of 30 weeks' incubation. Because of the generally consistent results, the data were employed in calculating the N mineralization potential, Nₒ, of each soil, based on the hypothesis that rate of N mineralization was proportional to the quantity of N comprising the mineralizable substrate. Values of Nₒ ranged from about 20 to over 300 ppm of air-dry soil. The fraction of total N comprising Nₒ varied widely (5 to 40%) among soils. Mineralization rate constants did not differ significantly among most of the soils. The most reliable estimate of the rate constant, k was .054 ± .009 week⁻¹. The time required to mineralize one-half of Nₒ, t½, was estimated to be 12.8 ± 2.2 weeks. Results suggest that the forms of organic N contributing to Nₒ were similar for most of the soils.read more
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Nitrogen cycling and origin of ammonium during infiltration of treated wastewater for managed aquifer recharge
TL;DR: In this article, the authors investigated the potential for ammonium production in treated wastewater through an organic-rich soil in column experiments operated with wetting and drying cycles, indicating that the soil was likely the major source but also that nitrate may have been the source of some of the ammonium.
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Journal ArticleDOI
Differentiating the mineralization dynamics of the originally present and newly synthesized amino acids in soil amended with available carbon and nitrogen substrates.
Wei Zhang,Chao Liang,Chao Liang,Jenny Kao-Kniffin,Hongbo He,Hongtu Xie,Hong Zhang,Xudong Zhang +7 more
TL;DR: It is concluded that the presence of readily degradable C and inorganic N controls the mineralization of newly synthesized and original amino acid pools in soil differently, which is a crucial mechanism in adjusting the N supply and sequestration processes in soil ecosystems.
Journal ArticleDOI
Nationally Coordinated Evaluation of Soil Nitrogen Mineralization Rate using a Standardized Aerobic Incubation Protocol
Timothy S. Griffin,C. W. Honeycutt,S. L. Albrecht,Karamat R. Sistani,H. A. Torbert,Brian J. Wienhold,Bryan L. Woodbury,Robert K. Hubbard,J. M. Powell +8 more
TL;DR: Aerobic incubation methods have been widely used to assess soil nitrogen (N) mineralization, but standardized protocols are lacking as discussed by the authors, and a single silt loam soil was subjected to aerobic incubation at six USDA-ARS locations using a standardized protocol.