Nitrogen mineralization potential of organomineral size separates from soils with annual straw incorporation

作者: B. T. Christensen , J. E. Olesen

DOI: 10.1046/J.1365-2389.1998.00130.X

关键词:

摘要: With annual incorporation of straw, soil N mineralization is expected to increase whereby requirements for fertilizer inputs may be reduced. Samples whole soil, clay (< 2 μm), silt (2-20 μm) and sand (20-2000 sized organomineral separates from three soils with additions straw ranging 0 12 t ha -1 were leached after 0, 1, 2, 4, 8, 16 weeks incubation at 20°C, determine the content NH 4 + NO 3 . A three-pool model using first order kinetics fixed rate constants (N 1 , k = 0.231 day ; 0.00693 0) was fitted data. The mineralizability (mg g N) differed among types. Straw generally increased fast passive pool while medium-term reduced in size. averaged 0.8, 2.6 96.6% N, respectively. order: < clay. lability a given size separate almost similar across types managements. active pools ) 7.1% 2.2% N. main difference related pool, which accounted 5.5% 1.2% silt. Mineral produced during ranged 63 105 kg Effects disposal small 11 ). Maximum response adding more diminished Long-term cereal contributes mainly slow turnover.

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