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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Journal ArticleDOI
Towards a standardised procedure for determining the potentially mineralisable nitrogen of soil
W. J. Wang,Caleb Smith,Deli Chen +2 more
TL;DR: In this article, the authors re-appraised the concept of potentially mineralisable N and its determination procedures were re-evaluated in order to obtain reliable techniques for predicting N mineralisation dynamics in soil for sustainable management of land resources.
Journal ArticleDOI
Relationships among Mineralizable Soil Nitrogen, Soil Properties, and Climatic Indices
Jacynthe Dessureault-Rompré,Bernie J. Zebarth,David L. Burton,Mehdi Sharifi,Julia Cooper,Cynthia A. Grant,Craig F. Drury +6 more
TL;DR: In this paper, the authors used a multiple regression model to predict the variability of soil mineralizable N pool size in a wide range of arable soils in Canada and found that soil properties were relatively eff ective predictors of N 0 with soil organic N (SON) and sand explaining 40 and 34% of the variability.
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Nitrogen mineralization rates in saline vs. salt-amended soils
TL;DR: In this article, the authors compared N mineralization rates in salt-amended nonsaline soils to naturally-occurring saline soils and found that leached saline soils often accumulated greater amounts of inorganic N compared to their native saline counterparts, particularly with the 5 dS m−1 Chino soil.
Journal ArticleDOI
Effects of the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on abundance and activity of ammonia oxidizers in soil
TL;DR: It is revealed that, despite the different cellular biochemistry and metabolism existing between bacteria and archaea domains, DMPP exerts its inhibitory effect against both soil bacterial and archaeal ammonia-oxidizing transcriptional activity.
Journal ArticleDOI
Die N‐Mineralisierung von Böden im Laborbrutversuch
TL;DR: In this article, the authors investigate the effect of soil fertility on the mineralization of arable and grassland soils and find that the average daily rate of mineralization ranges from 5-60 μg Nmin/10 g DM to 50°C.