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Ammonia, Methane, and Nitrous Oxide Emission from Pig Slurry Applied to a Pasture in New Zealand

Robert R. Sherlock^a, Sven G. Sommer^*,b, Rehmat Z. Khan, C. Wesley Wood^b, Elizabeth A. Guertal^b, John R. Freney^c, Christopher O. Dawson^d and Keith C. Cameron^a

^a Soil Plant and Ecological Sciences Division, P.O. Box 84, Lincoln Univ., Canterbury, New Zealand
^b Dep. of Agronomy and Soils, 236 Funchess Hall, Auburn University, AL 36849-5412
^c CSIRO Plant Industry, G.P.O. Box 1600, Canberra, ACT, Australia
^d Animal and Food Sciences Division, P.O. Box 84, Lincoln Univ., Canterbury, New Zealand

View larger version (37K): [in a new window]   Fig. 1. Daily mean soil temperature at 10 cm and air temperature (A), rainfall (B), rainfall - evapotranspiration (C), and soil water content (D) during the duration of the study. Error bars are ±1 SD.

View larger version (18K): [in a new window]   Fig. 2. Changes in surface soil pH (A), NO3 and NH4 concentrations (B), and volatile fatty acids (VFA) (C) in the pasture soil following slurry application. Error bars are ±1 SD.

View larger version (18K): [in a new window]   Fig. 3. Ammonia emission from the slurry amended area during the study (A) and cumulative NH3 loss in Leuning samplers and Ferm tubes (B).

View larger version (18K): [in a new window]   Fig. 4. Methane emission from the slurry amended area, and the control areas during the study (A), and the relationship between CH4 emission and the volatile fatty acid concentration in the 0- to 5-cm surface layer of soil (B). Error bars are ±1 SD.

View larger version (31K): [in a new window]   Fig. 5. Nitrous oxide emission from the slurry amended area and the control areas during the study. Error bars are ±1 SD.