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Decomposition and Plant-Available Nitrogen in Biosolids

Laboratory Studies, Field Studies, and Computer Simulation

^a John Gilmour, Inc., P.O. Box 610, Fayetteville, AR 72702
^b Puyallup Research and Extension Center, Washington State Univ., Puyallup, WA 98371
^c Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824
^d Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA 24061
^e Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331

View larger version (32K): [in a new window]   Fig. 1. Biosolids percent decomposition versus time, Washington study.

View larger version (27K): [in a new window]   Fig. 2. Observed biosolids plant-available nitrogen (PAN) released during the growing season versus biosolids total N.

View larger version (26K): [in a new window]   Fig. 3. Predicted biosolids plant-available nitrogen (PAN) versus observed biosolids PAN during the growing season using actual decomposition kinetics, weather, and analytical data.

View larger version (29K): [in a new window]   Fig. 4. Mean predicted biosolids plant-available nitrogen (PAN) using mean decomposition kinetics versus predicted biosolids PAN using actual decomposition kinetics during the growing season. Both simulations used actual weather and analytical data.

View larger version (29K): [in a new window]   Fig. 5. Predicted first-year N mineralization (% of organic N) versus predicted growing-season (the experimental period or days from biosolids application to last plant sample collected) N mineralization.