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Fig. 2. Frequency distribution of Maryland Phosphorus Site Index (PSI) ratings for agricultural fields evaluated in Maryland with conventional soil test P (Mehlich-1 P) (a) less than (n = 354) or (b) greater than (n = 292) the 75 mg kg-1 environmental threshold.





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The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal