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Estimating Plant-Available Nitrogen Release from Manures, Composts, and Specialty Products

^a Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331
^b Dep. Crop and Soil Sciences, Washington State Univ., 7612 Pioneer Way E., Puyallup, WA 98371
^c Dep. Horticulture, Oregon State Univ. North Willamette Research and Extension Center, Aurora, OR 97002

View larger version (22K): [in a new window]   Fig. 1. Cumulative decomposition in the laboratory at 22°C for organic amendments incubated in soils from Washington (WA) and Oregon (OR) field sites in 2002 and 2003. Open symbols represent uncomposted organic amendments, whereas filled symbols represent amendments that were "composted." Fitted regression equations for cumulative decomposition of each amendment are shown in Table 3.

View larger version (15K): [in a new window]   Fig. 2. Plant-available nitrogen (PAN) observed for the full season in the field vs. PAN observed at 70 d in laboratory incubations at 22°C.

View larger version (18K): [in a new window]   Fig. 3. Relationship between full-season PAN in field trials and organic amendment C/N.

View larger version (26K): [in a new window]   Fig. 4. Observed and modeled PAN for laboratory incubations of amendments included in the fresh vs. "composted" product comparison. Data points represent averages across soils and years (n = 2 for rabbit manure; n = 4 for others). Error bar is standard error of the mean computed across soils and years. Point estimates of PAN were estimated by the DECOMPOSITION model for 14, 42, and 70 d of incubation at 22°C.

View larger version (18K): [in a new window]   Fig. 5. Observed and modeled PAN for laboratory incubation at 22°C and for full-season field trials. Dotted line is 1:1 line.