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Soil Test Calibration for Predicting Corn Response to Phosphorus in the Northeast USA

^a Dep. of Plant Biology and Pathology, 59 Dudley Road-Foran Hall, Cook College, New Brunswick, NJ 08901-8520
^b Plant and Soil Science Dep., 215 Hills Agric. Science, Univ. of Vermont, Burlington, VT 05405
^c Dep. of Plant Science, U-67, Univ. of Connecticut, Storrs, CT 06269-4067
^d Dep. of Crop and Soil Sciences, 410 Agricultural Science and Industries Building, Penn State Univ., University Park, PA 16802
^e Agriculture and Natural Resources Dep., 163 Townsend Hall, Univ. of Delaware, Newark, DE 19716
^f Dep. of Natural Resource Sciences and Landscape Architecture, 214 H.J. Patterson Hall, Univ. of Maryland, College Park, MD 20742
^g Dep. of Plant and Soil Sciences, Bowditch Hall 207, Univ. of Massachusetts, Amherst, MA 01003-0910
^h USDA-ARS, NEPSWL, Room 23, Univ. of Maine, Orono, ME 04469
ⁱ Plant, Soil and Environmental Sciences, Room 409A, 5722 Deering Hall, Univ. of Maine, Orono, ME 04469-5722
^j Univ. of Maine CE, 495 College Ave., Orono, ME 04473-1294
^k CELS-PLS, 214 Woodward Hall, Univ. of Rhode Island, Kingston, RI 02881
^l Division of Plant and Soil Sciences, West Virginia Univ., P.O. Box 6108, Morgantown, WV 26506-6108
^m Plant Biology Dep., Spaulding Hall, Univ. of New Hampshire, Durham, NH 03824
ⁿ Crop and Soil Sciences, 1004 Bradfield Hall, Cornell Univ., Ithaca, NY 14853

View larger version (25K): [in a new window]   Fig. 1. Relationships between soil P extracted by five soil test extractants and relative yield as calculated based on the broadcast treatment. Triangle symbols are statistically significant at the P > F 0.10 level; circle symbols are not significant. Vertical lines indicate current soil test P critical levels for individual states.

View larger version (25K): [in a new window]   Fig. 2. Relationships between soil P extracted by five soil test extractants and relative plant height at 35 d after planting as calculated based on the broadcast treatment. Triangle symbols are statistically significant at the P > F 0.05 level; circle symbols are not significant. Vertical lines indicate current soil test P critical levels for individual states.

View larger version (12K): [in a new window]   Fig. 3. Morgan and Modified Morgan P analyzed by ICP and colorometric methods.