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Nitrogen balance in...
Nitrogen balance in a stockless organic cropping system with different strategies for internal N cycling via residual biomass
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- Råberg, Tora (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology,SLU, Sweden
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- Carlsson, Georg (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology
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- Jensen, Erik Steen (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Biosystem och teknologi,Department of Biosystems and Technology
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(creator_code:org_t)
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- 2018-07-31
- 2018
- Engelska.
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Ingår i: Nutrient Cycling in Agroecosystems. - : Springer Netherlands. - 1385-1314 .- 1573-0867. ; 112:2, s. 165-178
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Abstract
Ämnesord
Stäng
- A major future challenge in agriculture is to reduce the use of new reactive nitrogen (N) while maintaining or increasing productivity without causing a negative N balance in cropping systems. We investigated if strategic management of internal biomass N resources (green manure ley, crop residues and cover crops) within an organic crop rotation of six main crops, could maintain the N balance. Two years of measurements in the field experiment in southern Sweden were used to compare three biomass management strategies: anaerobic digestion of ensiled biomass and application of the digestate to the non-legume crops (AD), biomass redistribution as silage to non-legume crops (BR), and leaving the biomass in situ (IS). Neither aboveground crop N content from soil, nor the proportion of N derived from N2 fixation in legumes were influenced by biomass management treatment. On the other hand, the allocation of N-rich silage and digestate to non-legume crops resulted in higher N2 fixation in AD and BR (57 and 58 kg ha−1 year−1), compared to IS (33 kg ha−1 year−1) in the second study year. The N balance ranged between − 9.9 and 24 kg N ha−1, with more positive budgets in AD and BR than in IS. The storage of biomass for reallocation in spring led to an increasing accumulation of N in the BR and AD systems from one year to another. These strategies also provide an opportunity to supply the crop with the N when most needed, thereby potentially decreasing the risk of N losses during winter. © 2018, The Author(s).
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Jordbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Agricultural Science (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Nyckelord
- Anaerobic digestion
- Arable and horticultural crops
- N balance
- N2 fixation
- Soil and residue N
- Strategic biomass N management
- agricultural management
- biomass
- crop plant
- crop production
- crop rotation
- cropping practice
- nitrogen
- nitrogen fixation
- organic farming
- seasonal variation
- soil nitrogen
- strategic approach
- Sweden
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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