Mineralization of carbon and nitrogen from fresh and anaerobically stored sheep manure in soils of different texture |
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Authors: | Peter Sørensen Erik Steen Jensen |
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Institution: | (1) Section of Plant Nutrition, Environmental Science and Technology Department, Risø National Laboratory, DK-4000 Roskilde, Denmark |
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Abstract: | A sandy loam soil was mixed with three different amounts of quartz sand and incubated with (15NH4)2SO4 (60 g N g-1 soil) and fresh or anaerobically stored sheep manure (60 g g-1 soil). The mineralization-immobilization of N and the mineralization of C were studied during 84 days of incubation at 20°C. After 7 days, the amount of unlabelled inorganic N in the manure-treated soils was 6–10 g N g-1 soil higher than in soils amended with only (15NH4)2SO4. 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. |
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Keywords: | Ammonium sulphate Biomass N Clay CO2 Gross mineralization 15N |
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