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Carbon and Nitrogen Dynamics During Incubation of Manured Soil

^a USDA-ARS, Northern Plains Area, 40335 Rd. GG, Akron, CO 80720
^b Animal Manure and By-Products Lab., ANRI, USDA, Bldg. 306, Rm. 109, BARC-East, Beltsville, MD 20705
^c Environmental Microbial Safety Laboratory, Bldg. 173, Rm 204, BARC-East, 10300 Baltimore Ave., Beltsville, MD 20705
^d USDA-ARS, Environmental Quality Lab., BARC, Beltsville, MD 20705

View larger version (13K): [in a new window]   Fig. 1. Weekly CO2 production in jars with added acetylene. n = 107 for the manured soil. n = 6 for the control soils. Error bars are the SEM. The least significant difference (LSD) according to a t test is shown.

View larger version (14K): [in a new window]   Fig. 2. Extractable mineral N pools measured during the 6-wk incubation of manured and control soils. NH4–N (top), NO3–N (middle), and NH4–N + NO3–N (bottom). n = 107 for the manured soil. n = 6 for the control soils. Error bars are the SEM. The least significant difference (LSD) according to a t test is shown.

View larger version (15K): [in a new window]   Fig. 3. Weekly nitrous oxide fluxes measured during the 6-wk incubation of manured and control soils. Acetylene added (top graph), no acetylene added (bottom graph). n = 107 for the manured soil. n = 6 for the control soils. Error bars are the SEM. The least significant difference (LSD) according to a t test is shown.

View larger version (13K): [in a new window]   Fig. 4. Frequency distribution of the percentage denitrified manure N during the 6-wk incubation. n = 107. The values were calculated as (total denitrified N-control denitrified N)/added manure N.