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Cattle Slurry Affects Nitrous Oxide and Dinitrogen Emissions from Fertilizer Nitrate

Dep. of Agriculture and Rural Development, Agricultural and Environmental Science Division, Newforge Lane, Belfast BT9 5PX, UK

View larger version (14K): [in a new window]   Fig. 1. The mean effect of cattle slurry (CS) (average of 14CS15NO3, 15CS15NO3, and 15CS14NO3 treatments) on the flux of N2O when applied at the same time as KNO3 to grassland on four occasions in 1997. (LSD values are for comparing any two means at P < 0.05).

View larger version (14K): [in a new window]   Fig. 2. The mean effect of cattle slurry (CS) (average of 14CS15NO3, and 15CS15NO3 treatments) on the flux of N2 when applied at the same time as KNO3 to grassland on four occasions in 1997. (LSD values are for comparing any two means at P < 0.05).

View larger version (17K): [in a new window]   Fig. 3. The mean slurry-induced flux of CO2 (average of 14CS15NO3, 15CS15NO3, and 15CS14NO3 treatments corrected for flux from the control) over four applications of cattle slurry (CS) when applied at the same time as KNO3 to grassland in 1997.

View larger version (17K): [in a new window]   Fig. 4. The effect of labeling the NH4 pool in cattle slurry (CS) at 52 atom% 15N on the rate of dilution of the NO3 pool in soil, enriched by the application of KNO3 containing 52 atom% 15N at the same time to grassland on four occasions in 1997. (LSD values are for comparing any two means at P < 0.05).

View larger version (15K): [in a new window]   Fig. 5. The enrichment of N2O evolved when cattle slurry with its NH4 pool enriched at 52 atom% 15N and unlabeled KNO3 were applied at the same time to grassland on four occasions in 1997. (LSD values are for comparing means within application times at P < 0.05).