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Potentiella mätmetoder för att uppskatta kvävegödslingsvärdet hos organiska gödselmedel

Delin, Sofia and Stenberg, Bo and Nyberg, Anna and Brohede, Leif (2010). Potentiella mätmetoder för att uppskatta kvävegödslingsvärdet hos organiska gödselmedel. Technical Report. Uppsala: (NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
, Sveriges lantbruksuniversitet. Rapport (Sveriges lantbruksuniversitet, Institutionen för mark och miljö) ; 6
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Abstract

This study evaluated potential methods to estimate the nitrogen fertilization value of a broad spectrum of different organic fertilizers. Ryegrass pot experi-ments were used to determine the nitrogen fertilization effect of 15 different fertilizers. These included different kinds of manure, different powders made from offal, rapeseed cake, lucerne pellets, sewage sludge, biogas residue, vi-nasse and mussel compost. Incubation studies showed that previously degraded materials such as manure, compost and biogas residue had low net nitrogen mineralization after addition to soil, whereas net mineralization was high from undegraded materials such as pelleted plant or meat products. The short-term nitrogen fertilizer value of degraded materials was therefore rather well characterized by their ammonium content, whereas the undegraded fertilizer materials required a different method. Warm water-extractable nitrogen proved to be unsatisfactory as a method for extracting readily mineralizable nitrogen, especially from animal products. Amino acid nitrogen and crude fibre analysis were also unsatisfactory for describing readily degradable or more persistent organic material. However, the carbon/nitrogen ratio very accurately reflected the short-term plant-available nitrogen content. Measurements of near infrared reflectance (NIR) proved to have the potential to be a quick and cheap method to estimate the fertilizer value of the nitrogen in fertilizers. However, developing a satisfactory model for NIR measurements would require more extensive material than the 15 fertilizers examined here. Nevertheless, it should be possible to use the carbon/nitrogen ratio already, through its negative linear relationship with the proportion of total fertilizer nitrogen with short-term fertilizer effect. A ratio of around two indicates that approximately 80% of the nitrogen is as available as mineral fertilizer nitrogen, while a ratio above 15 means that scarcely any short-term nitrogen fertilization effect will be obtained from that fertilizer.

Authors/Creators:Delin, Sofia and Stenberg, Bo and Nyberg, Anna and Brohede, Leif
Title:Potentiella mätmetoder för att uppskatta kvävegödslingsvärdet hos organiska gödselmedel
Series/Journal:Rapport (Sveriges lantbruksuniversitet, Institutionen för mark och miljö) (11698476)
Year of publishing :2010
Number:6
Number of Pages:20
Place of Publication:Uppsala
Publisher:Institutionen för mark och miljö, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-9004-3
Language:Swedish
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:NIR , kol/kväve-kvot, restprodukt, organisk gödsel, gödslingseffekt, vattenextraktion, kväve
URN:NBN:urn:nbn:se:slu:epsilon-8-833
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-833
ID Code:5081
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Lennart Mattsson
Deposited On:20 Oct 2010 00:00
Metadata Last Modified:02 Dec 2014 10:36

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