flows to swedish food chain, fertilizer value, effect on mycorrhiza and environmental Impact of Reuse
Linderholm, Kersti
(2012).
Phosphorus.
Diss. (sammanfattning/summary)
SLU, Alnarp, Sweden :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae, 1652-6880
; 2012:84
ISBN 978-91-576-7731-0
[Doctoral thesis]
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PDF
927kB |
Abstract
Phosphorus is an essential element for plants, animals and humans and is also a scarce resource as a raw material for fertilizer production. The flows of phosphorus to and from Swedish agriculture and food chain was investigated with a material flow analysis (MFA). The fertilizer value of recycled phosphorus in chemically precipitated sewage sludge, biological sludge, mineral fertilizer and ash was investigated in a three-year field experiment. The impact of different phosphorus fertilizers on arbuscular mycorrhiza (AM) was studied in field and pot experiments, and the environmental impact of different phosphorus fertilizers was evaluated by Life Cycle Assessment (LCA).
The results showed that Sweden has a positive phosphorus balance, but that phosphorus is concentrated on farms with more than one animal unit per hectare. Furthermore, the calculations were made on recent production and if Sweden increases the level of self-sufficiency, more phosphorus would be needed in the system.
In a long-term perspective, the form of phosphorus fertilizer used seems to be less important than maintaining soil phosphorus content to ensure phosphorus delivery to the crop when conditions in terms of moisture, temperature etc. are optimal. Easily soluble phosphorus in mineral fertilizer can be essential in a short-term perspective under dry conditions, or on phosphorus-deficient soils.
This thesis shows that with balanced phosphorus fertilization, it is possible to achieve good yield without compromising the possibilities for AM fungi to colonize roots.
Phosphorus recovery from ash is costly in terms of both energy and carbon dioxide emissions. The most efficient option for sewage sludge is to use it directly on farmland, but associated cadmium addition to soils can be a problem. The cadmium imports with food and feed to Sweden are currently unknown. Nitrogen is a valuable nutrient and is energy-demanding to replace, so fertilization systems that can keep nitrogen in usable form for production are preferable.
It was concluded that the energy and carbon dioxide bound during photosynthesis should be assigned to agricultural production and not the product user, e.g. a sludge incineration facility. Production of bioenergy should include all products that contain energy bound by photosynthesis, not only products used for fuel and heating.
Authors/Creators: | Linderholm, Kersti | ||||||||||
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Title: | Phosphorus | ||||||||||
Subtitle: | flows to swedish food chain, fertilizer value, effect on mycorrhiza and environmental Impact of Reuse | ||||||||||
Alternative abstract: |
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Series/Journal: | Acta Universitatis Agriculturae Sueciae (1652-6880) | ||||||||||
Year of publishing : | 2012 | ||||||||||
Number: | 2012:84 | ||||||||||
Number of Pages: | 45 | ||||||||||
Papers/manuscripts: |
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Place of Publication: | SLU, Alnarp, Sweden | ||||||||||
Publisher: | Dept. of Agrosystems, Swedish University of Agricultural Sciences | ||||||||||
ISBN for printed version: | 978-91-576-7731-0 | ||||||||||
ISSN: | 1652-6880 | ||||||||||
Language: | English | ||||||||||
Additional Information: | Finansiärer: Stiftelsen Växtnäringsforskning Anders Elofssons fond (KSLA) Bergstens fond (KSLA) VA Forsk (Svenskt Vatten) | ||||||||||
Publication Type: | Doctoral thesis | ||||||||||
Full Text Status: | Public | ||||||||||
Agris subject categories.: | F Plant production > F04 Fertilizing F Plant production > F08 Cropping patterns and systems P Natural resources > P30 Soil science and management | ||||||||||
Subjects: | Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science > Soil biology Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy (A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use | ||||||||||
Agrovoc terms: | phosphorus, vesicular arbuscular mycorrhizae, cadmium, fertilizers, life cycle, assessment, sewage sludge | ||||||||||
Keywords: | Arbuscular mycorrhiza (AM), Material Flow Analysis (MFA), sewage sludge, cadmium, fertilizer, Life Cycle Assessment (LCA), phosphorus, manure | ||||||||||
URN:NBN: | urn:nbn:se:slu:epsilon-e-675 | ||||||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-675 | ||||||||||
ID Code: | 9166 | ||||||||||
Department: | (LTJ, LTV) > Agrosystems (until 121231) | ||||||||||
Deposited By: | K Linderholm | ||||||||||
Deposited On: | 26 Oct 2012 07:01 | ||||||||||
Metadata Last Modified: | 02 Dec 2014 10:52 |
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