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Seven Years of Biosolids versus Inorganic Nitrogen Applications to Tall Fescue

^a Washington State Univ. Puyallup Research and Extension Center, 7612 Pioneer Way E., Puyallup, WA 98371-4998
^b Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331

View larger version (21K): [in a new window]   Fig. 1. Fall residual soil nitrate in a 1.2-m soil profile for medium (565 kg N ha-1) and high (848 kg N ha-1) rates of dewatered biosolids, compared with inorganic N (34–0–0) and zero-N treatments. Inorganic N treatment was 202 kg ha-1 in 1993, 336 kg ha-1 in 1994–1996, and 403 kg ha-1 in 1997–1999. Means within a year followed by a different letter are significantly different at P < 0.05 by protected LSD.

View larger version (21K): [in a new window]   Fig. 2. DTPA-extractable Zn, Cu, and Cd at 0- to 8-, 8- to 15-, and 15- to 30-cm depths for heat-dried biosolids applied to tall fescue for 5 yr (1993–1997).