JEQ Journal of Natural Resources and Life Sciences Education
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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
Journal of Natural Resources
and Life Sciences Education
Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome