| Title: |
Site-Specific Mehlich 3-P Recommendations for Florida's Sandy Soils. |
| Authors: |
Rodriguez, Amanda N.1,2 (AUTHOR), Nair, Vimala D.1 (AUTHOR) vdn@ufl.edu, Freitas, Andressa Morato1 (AUTHOR), Maltais-Landry, Gabriel1 (AUTHOR), Sollenberger, Lynn E.3 (AUTHOR) |
| Source: |
Communications in Soil Science & Plant Analysis. 2025, Vol. 56 Issue 6, p841-855. 15p. |
| Subject Terms: |
*PHOSPHATE fertilizers, *ION-permeable membranes, *SOIL mineralogy, *AGRICULTURE, *ION exchange resins |
| Abstract: |
In 2010, the Mehlich 3 (M3) soil extractant replaced Mehlich 1 (M1) as the official soil test for Florida. While a linear expression was initially established to reasonably estimate M3-P values based on M1-P recommendations for acid-mineral soils in Florida, Florida farmers have been skeptical of revised P recommendations and reported lower yields when following them, suggesting that adjustments to recommended P fertilizer application rates may be needed. This study evaluated different extraction protocols to estimate bioavailable P in major agricultural mineral soil orders, predominant in Florida. Extractions were conducted on 420 surface samples for M1- and M3-P and on 123 samples for FeO (iron oxide impregnated strip), Haney H3A, and anion exchange resin membrane (AERM). Our findings suggest that the current P fertilizer recommendations, which rely on the M1-P to M3-P linear relationship, may underestimate agronomic thresholds for both low and high P levels. The variability in P extraction by FeO compared to M3 appears to be site-specific and could explain yield differences observed with M3 testing. While promising, our revised P recommendations need further validation through additional yield response analyses across various locations to improve the accuracy of predicting crop yields based on soil P values. [ABSTRACT FROM AUTHOR] |
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