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Plant-based biogas production for improved nutrient management of beetroot in stockless organic farming

Gunnarsson, Anita (2012). Plant-based biogas production for improved nutrient management of beetroot in stockless organic farming. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2012:83
ISBN 978-91-576-7730-3
[Doctoral thesis]

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Abstract

Transition from a nutrient management system based on green manure (GrM system) to one based on biodigested plant material produced within the crop rotation (BG system) was investigated in crop sequences including clover-grass,
beetroot and cereals. The overall hypothesis was that transition would improve nitrogen (N) availability. In field experiments on sandy soil, harvested clover-grass
ley had lower N content in clover and biomass produced than GrM-ley. The residual N effect of clover-grass ley harvested twice (2H) or three times (3H) was 42 and 74 kg N ha-1 less than that of GrM-ley considering uptake in beetroot and mineral N in soil at harvest. Expressed as inorganic fertiliser equivalents the reduction was 52 and 80 kg N ha-1, respectively. Net inorganic N equivalents (from effluent plus pre-crops) were simulated for three crop sequences: (A) green manure ley, beetroot, winter rye; (B) harvested ley, beetroot, winter rye; and (C) harvested
ley, spring barley, beetroot, where B and C represented BG systems and A a GrM system. For three hectares with the entire crop sequence A, B and C, net inorganic N equivalents were 73, 74 and 128 kg N, respectively. Net inorganic N equivalents in BG systems with 2H- and 3H-ley did not differ significantly. When the whole increase in net inorganic N equivalents was used for beetroot following barley, marketable beetroot yield increased by 1.7 Mg ha-1 (12%) in the BG system with 2H-ley and by 5.8 Mg ha-1 (34%) with 3H-ley compared with beetroot grown without digestate fertilisation following a GrM-ley. Fertilisation with a moderate level of effluent of beetroot directly following harvested ley gave unexpectedly low yield responses. Compositional nutrient diagnosis (CND) using norms derived from aeroponic experiments with 22 treatments with dynamic nutrient supply and partial least squares (PLS) were synonymous in showing K as more growth-limiting than N
at early growth stages. Growth limitation was more severe in effluent-fertilised beetroot following harvested ley than following barley. Pot experiments showed an apparent net mineralisation of organically bound N in digestate of 12%. The overall conclusion was that a BG system can greatly improve N efficiency. However, as the nutrient buffering capacity in sandy soil is low, inappropriate use of the effluent, e.g. at an unsuitable point in the crop rotation, can negate the N efficiency benefits.

Authors/Creators:Gunnarsson, Anita
Title:Plant-based biogas production for improved nutrient management of beetroot in stockless organic farming
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :16 October 2012
Volume:2012:83
Number of Pages:107
Papers/manuscripts:
NumberReferences
IGunnarsson, A., Bengtsson, F. & Caspersen, S. (2010). Use efficiency of nitrogen from biodigested plant material by ryegrass. Journal of Plant Nutrition and Soil Science 173, 113-119.
IIGunnarsson, A., Lindén, B. & Gertsson, U. (2008). Residual nitrogen effects in organically cultivated beetroot following a harvested/green manured grass-clover ley. Journal of Plant Nutrition 31, 1355–1381.
IIIGunnarsson, A., Lindén, B., and Gertsson U. 2011. Biodigestion of plant material can improve nitrogen use efficiency in a red beet crop sequence. HortScience 46(5), 765-775.
IVIV Gunnarsson, A., Asp, H., and Gertsson U., Growth-limiting nutrients in beetroot fertilized with biodigested plant material. In manuscript.
Place of Publication:Alnarp
Publisher:Område Hortikultur, Sveriges lantbruksuniversitet ,
Associated Programs and Other Stakeholders:SLU/LTJ - Tillväxt Trädgård
SLU - Research Areas for the Future > Future Agriculture
SLU - Agricultural Sciences for Global Development > Land use and climate change
SLU - Agricultural Sciences for Global Development > Efficiency in farming systems
ISBN for printed version:978-91-576-7730-3
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Horticulture
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Horticulture
Agrovoc terms:beta vulgaris, nitrogen content, anaerobic treatment, trifolium, slurry, nutrient management
Keywords:Beta vulgaris var. conditiva Alef, residual N effect, pre-crop, clover-grass, biogas, anaerobic digestion, effluent, digestate, slurry
URN:NBN:urn:nbn:se:slu:epsilon-e-658
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-658
ID Code:9128
Department:(LTJ, LTV) > Horticulture (until 121231)
External funders:Swedish Board of Agriculture
Deposited By: Anita Gunnarsson
Deposited On:22 Oct 2012 13:21
Metadata Last Modified:02 Dec 2014 10:52

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