Soil phosphorus saturation ratio sets comparable manure application cutoffs across states differing in agronomic soil test
SJ Crittenden, QM Ketterings, J Knight… - Soil Science, 2017 - journals.lww.com
Regionalization of phosphorus indices (PI) across state boundaries requires evaluation of
compatibility of agronomic soil test P levels used as screening tools and/or cutoffs for land
application of manure. Within the Chesapeake Bay watershed, both Morgan and Mehlich-3
(M3) soil tests are used. In New York, 40 mg P Morgan kg− 1 is the upper limit for land
application of manure for high P transport risk scenarios. In Pennsylvania, 200 mg P M3 kg−
1 determines whether the PI must be used (screening tool). We evaluate three M3-derived …
compatibility of agronomic soil test P levels used as screening tools and/or cutoffs for land
application of manure. Within the Chesapeake Bay watershed, both Morgan and Mehlich-3
(M3) soil tests are used. In New York, 40 mg P Morgan kg− 1 is the upper limit for land
application of manure for high P transport risk scenarios. In Pennsylvania, 200 mg P M3 kg−
1 determines whether the PI must be used (screening tool). We evaluate three M3-derived …
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