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Management of N mineralization from crop residues of high N content using amendment materials of varying quality
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Rahn, C. R., Bending, G. D., Turner, M. K. and Lillywhite, Robert (2003) Management of N mineralization from crop residues of high N content using amendment materials of varying quality. Soil Use and Management, 19 (3). pp. 193-200. doi:10.1079/SUM2003188 ISSN 0266-0032.
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Official URL: http://dx.doi.org/10.1111/j.1475-2743.2003.tb00304...
Abstract
A potential technique for reducing overwinter leaching from high N containing crop residues is to immobilize the N released during decomposition by co-incorporating materials of a wider C : N ratio. This article describes the use of laboratory incubation experiments to investigate the effects of a wide range of such amendment materials on the mineralization of N from sugar beet and brassica leaf residues in a sandy loam and a silt loam. These materials were of varying quality, with C : N ratio ranging from 15 : 1 to 520 : 1, and cellulose content from 0 to 34%. Amendments were added at a fixed rate of 3.5 mg C g−1 of dry soil, equivalent to around 10 t ha−1 C (to 20 cm depth). The soils were then incubated at 15°C, and net mineral N derived from the leaves was measured at regular intervals over 168 days. Net mineralization of residue N was greatest with molasses (C : N ratio of 18 : 1), whereas paper waste (C : N ratio of 520 : 1) reduced N mineralized by up to 90% compared with a soil-only control. As the concentration of cellulose and lignin in the amendment materials increased, so the amounts of N mineralized decreased, with 62 and 54% of variance in N mineralized explained by cellulose and lignin content, respectively. Reduced levels of mineral N were associated with higher levels of biomass-N. The levels of N2O-N lost from sugar beet residues on day 14 were significantly reduced from 66 to 5 g ha−1 where compactor (cardboard) waste had been mixed into sandy loam, but this effect was not observed in the silt loam. These techniques could lead to greater efficiency of N use in rotations through reduction in N losses, and provide alternative routes for disposal of wastes when the EC Landfill Directive is implemented.
Item Type: | Journal Article | ||||||||||
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Subjects: | S Agriculture > SB Plant culture | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||||
Library of Congress Subject Headings (LCSH): | Crop residues, Denitrification | ||||||||||
Journal or Publication Title: | Soil Use and Management | ||||||||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||||
ISSN: | 0266-0032 | ||||||||||
Official Date: | 1 September 2003 | ||||||||||
Dates: |
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Volume: | 19 | ||||||||||
Number: | 3 | ||||||||||
Number of Pages: | 8 | ||||||||||
Page Range: | pp. 193-200 | ||||||||||
DOI: | 10.1079/SUM2003188 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Funder: | Great Britain. Department for Environment, Food and Rural Affairs (DEFRA) |
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