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 mineralization in soil with conventional and organomineral fertilization practices
TL;DR: In this paper, Nitrogen mineralization in soil treated with no fertilizer (U), conventional fertilizer (C), organic+conventional fertilizer (OC), and organomineral fertilizer (OM) was studied.
Journal ArticleDOI
Simultaneous Estimation of Actual Litter Enzymatic Catalysis and Respiration Rates with a Simple Model of C Dynamics in Sphagnum-Dominated Peatlands
Sébastien Gogo,Sébastien Gogo,André-Jean Francez,André-Jean Francez,Fatima Laggoun-Défarge,Fatima Laggoun-Défarge,Nicolas Gouélibo,Nicolas Gouélibo,Frédéric Delarue,Nathalie Lottier,Nathalie Lottier +10 more
TL;DR: In this paper, a model of soil C dynamics was proposed that integrates all C fluxes from the solid to the gaseous form, and can be easily implemented experimentally.
Journal ArticleDOI
Influence of simulated erosion on soil properties and maize yield in Northwestern India
TL;DR: In this article, the immediate influence of artificial topsoil removal (simulated erosion) on selected soil properties, maize (Zea mays) growth and yield, and restoration of crop productivity with nitrogen (N) fertilization was determined.
Journal ArticleDOI
Nitrogen, Phosphorus, and Liming Effects of Poultry Layer Manures in Coastal Plain and Piedmont Soils
TL;DR: Nguyen et al. as mentioned in this paper applied fresh, composted, and pelleted manures to surface samples of three North Carolina soils (Belhaven, loamy, mixed, dysic, thermic Terric Haplosaprists; Cecil, fine, kaolinitic, thermophoric, typic Kanhapludults; and Lynchburg, fine-loamy, siliceous, semi-active, and thermic Aeric Paleaquults).
Journal ArticleDOI
Mineralização do nitrogênio de plantas de cobertura, solteiras e consorciadas, depositadas sobre um solo com histórico de cultivo de cebola
Roberta Pereira Martins,Jucinei José Comin,Luciano Colpo Gatiboni,Cláudio Roberto Fonsêca Sousa Soares,Rafael da Rosa Couto,Gustavo Brunetto +5 more
TL;DR: In this article, the authors evaluated the nitrogen mineralization of cover plant litter, intercropped or not, in a soil with a history of onion plantation and found that the decomposition of winter cover plants on the soil surface can increase nitrogen availability during the onion crop cycle.