Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 371258
Title Co-digestion of animal slurry can increase short-term nitrogen recovery by crops
Author(s) Boer, H.C. de
Source Journal of Environmental Quality 37 (2008). - ISSN 0047-2425 - p. 1968 - 1973.
Department(s) LR - Backoffice
Publication type Refereed Article in a scientific journal
Publication year 2008
Keyword(s) greenhouse-gas emissions - pig slurry - cattle slurry - ammonia volatilization - anaerobic-digestion - ryegrass - mineralization - soil - immobilization - grassland
Abstract Co-digestion changes slurry characteristics and is supposed to increase short-term nitrogen (N) uptake by crops after application. A higher N uptake from slurry reduces the need for additional mineral N fertilizer. If farmers apply co-digested slurry (CS), a higher N recovery has to be taken into account to prevent losses to the environment. Since data on the effects of co-digestion on N recovery by crops are scarce, a pot experiment was performed. The apparent N recovery (ANR) of five different co-digested pig slurries was compared with their raw source slurries (RS) during 105 d after a single fertilization of ryegrass (Lolium perenne L.), grown under controlled conditions. Slurry was mixed with sandy soil and grass was cut every 35 d. The results show that co-digestion increased (p <0.05) the ANR at first cut on average from 39 to 50%, at second cut from 7 to 9% (p <0.05), and had no effect on ANR at third cut (3%). The ANR increase at first cut was likely due to an increase of the NH4¿N/total N ratio along with a decrease of the organic C/total N ratio of slurry during co-digestion. Field application may under certain circumstances decrease N fertilizer value of CS, due to a higher NH3 emission compared to RS. A potential ANR increase may then be reduced, absent, or even become a decrease. Under comparable NH3 emissions, however, CS can in the short term be more valuable as an N fertilizer than RS, and fertilizer savings can likely be realized.
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