Delin, Sofia and Stenberg, Bo and Nyberg, Anna and Brohede, Leif
Potentiella mätmetoder för att uppskatta kvävegödslingsvärdet hos organiska gödselmedel.
Faculty of Natural Resources and Agricultural Sciences > Dept. of Soil and Environment, Sveriges lantbruksuniversitet.
Rapport (Sveriges lantbruksuniversitet, Institutionen för mark och miljö)
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 of Pages:||20|
|Place of Publication:||Uppsala|
|Publisher:||Institutionen för mark och miljö, Sveriges lantbruksuniversitet|
|ISBN for printed version:||978-91-576-9004-3|
|Full Text Status:||Public|
|Subjects:||ZZZ Don't use any more: Subject categories for Swedish research publications > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science|
|Keywords:||NIR , kol/kväve-kvot, restprodukt, organisk gödsel, gödslingseffekt, vattenextraktion, kväve|
|Divisions:||Faculty of Natural Resources and Agricultural Sciences > Dept. of Soil and Environment|
|Deposited By:||Lennart Mattsson|
|Deposited On:||20 Oct 2010 00:00|
|Metadata Last Modified:||03 May 2013 08:00|
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