Journal article
Mineralization of carbon and nitrogen from fresh and anaerobically stored sheep manure in soils of different texture
A sandy loam soil was mixed with three different amounts of quartz sand and incubated with ((NH4)-N-15)(2)SO4 (60 mu g N g(-1) soil) and fresh or anaerobically stored sheep manure (60 mu g g(-1) soil). The mineralization-immobilization of N and the mineralization of C were studied during 84 days of incubation at 20 degrees C.
After 7 days, the amount of unlabelled inorganic N in the manure-treated soils was 6-10 mu g N g(-1) soil higher than in soils amended with only ((NH4)-N-15)(2)SO4. However, due to immobilization of labelled inorganic N, the resulting net mineralization of N from manure was insignificant or slightly negative in the three soil-sand mixtures (100% soil+0% quartz sand; 50% soil+50% quartz sand; 25% soil+75% quartz sand).
After 84 days, the cumulative CO2 evolution and the net mineralization of N from the fresh manure were highest in the soil-sand mixutre with the lowest clay content (4% clay); 28% fo the manure C and 18% of the manure N were net mineralized. There was no significant difference between the soil-sand mixtures containing 8% and 16% clay, in which 24% of the manure C and -1% to 4% of the manure N were net mineralized.
The higher net mineralization of N in the soil-sand mixture with the lowest clay content was probably caused by a higher remineralization of immobilized N in this soil-sand mixture. Anaerobic storage of the manure reduced the CO2 evolution rates from the manure C in the three soil-sand mixtures during the initial weeks of decomposition.
However, there was no effect of storage on net mineralization of N at the end of the incubation period. Hence, there was no apparent relationship between net mineralization of manure N and C.
Language: | English |
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Publisher: | Springer-Verlag |
Year: | 1995 |
Pages: | 29-35 |
ISSN: | 14320789 and 01782762 |
Types: | Journal article |
DOI: | 10.1007/BF00336343 |
ORCIDs: | 0000-0003-3425-3690 |