Figures
- Plant Nutrient Issues for Sustainable Land Application

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Fig. 1. Predicted versus measured potentially mineralizable N in biosolids. Data symbols correspond to field studies conducted in Arkansas, Michigan, Virginia, and Washington in 1998 and 1999. From Gilmour et al. (2003).

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Fig. 2. Measured potentially mineralizable N for broiler litter versus that predicted using near infrared spectroscopy (NIRS). From Qafoku et al. (2001).

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Fig. 3. Estimated N source inputs over time from the Mississippi River watershed. From USGS (2000).

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Fig. 4. Mehlich 3–extractable P concentrations with depth after 10 yr of intensive swine manure applications. Data from Novak et al. (2000).

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Fig. 5. X-ray absorption near edge structure (XANES) spectroscopy of a high P soil and three P standards (P adsorbed to ferrihydrite, octacalcium phosphate, and hydroxyapatite). A linear combination of the spectra from the three standards matches the spectra from the soil and suggests P may exist in similar forms in the soil. From Beauchemin et al. (2003).