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
Nitrogen supply from mineralization of organic matter
TL;DR: In this paper, field measurements of the course of soil mineralization of nitrogen were performed on bare plots to obtain reliable data of the N-supply from organic matter which can be used for nitrogen fertilizer recommendations.
Journal ArticleDOI
Nitrogen mobility in biosolid-amended glaciated soil
Nikolaos P. Nikolaidis,Pradeep Chheda,Jeffrey A. Lackovic,Karl Guillard,Barbara Simpson,Tom Pedersen +5 more
TL;DR: In this article, the potential leaching and availability of nitrogen in biosolids and biosolid-amended glaciated soil were investigated using mineralization and column studies using simulated unsaturated soil conditions.
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Nitrogen-supplying capacity of leaves of Dactyladenia barteri (Hook ex olw) and Leucaena leucocephala (Lam.) de Wit in two soils of different acidity from southern Nigeria.
K. Mulongoy,M. O. Gasser +1 more
TL;DR: In this paper, the evolution of mineral and hydrosoluble organic N released from two soils differing in pH and treated with leaves of Leucaena leucocephala (0, 8.3, 16.7, and 33.7 g) was studied in the laboratory using the aerobic incubation-leaching method.
Journal ArticleDOI
Effect of the combined application of fungal residue and chemical fertilizers on the mineralization of soil organic carbon in paddy fields
TL;DR: The application of fungal residue and chemical fertilizer to paddy fields effectively alleviated soil acidification caused by chemical fertilizers and increased the nutrient content, MC, MR, C1, and C1 + C2 of soils.
Journal ArticleDOI
Carbon dynamic in sandy soil artificially contaminated with petroleum in the presence of various forms of inorganic nitrogen for bioremediation
TL;DR: In this article, the authors investigated the interactive effects of the concomitant use of petroleum and nitrogen forms on carbon dynamics, and ascertain the effect of the sandy soil characteristics on its process.