Author(s)

Zhongqi He, Hailin Zhang, O. Modesto Olanya, Jonathan M. Frantz, Robert P. Larkin

Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078, USA.
USDA-ARS, Application Technology Research Unit, University of Toledo MS#604, Toledo, OH 43606, USA.
USDA-ARS, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA.
USDA-ARS, New England Plant, Soil, and Water Laboratory, Orono, ME 04469, USA.
USDA-ARS, Southern Regional Research Center, 1100 Robert E Lee Blvd., New Orleans, LA 70124, USA.

Phosphorus (P) fertilization is frequently needed for profitable crop production. Modified Morgan P (MMP) is a soil test P used to estimate plant available P in soils. The critical values of MMP for P fertilization and maintenance recommendations are based on the P concentrations measured by a common colorimetric molybdenum blue method although other P quantification methods have also been used for MMP measurements. In this study, we collected 120 surface soil samples of Caribou Sandy loam under potato cultivation or its rotation crops from Maine, USA, and 72 soil samples of Cecil sandy loam with cotton/corn crops under conventional tillage and no-till management with chemical and poultry litter fertilization in Georgia, USA. The MMP levels in all 192 dry samples were greater when they were measured by an inductively coupled plasma (ICP)-based method, compared to the corresponding data produced from colorimetry. Our results show the two sets of data were positively and significantly correlated (r = 0.93, P < 0.001). In average, the ICP-based MMP level of the 192 samples was 23.3 mg P kg^–1 with standard deviation of 12.9, compared to the average of colorimetric MMP level of 14.9 mg P kg^–1 with standard deviation of 8.8. Based on the observations in this work, both colorimetric and ICP-based methods can be used for P fertilizer recommendation, but a conversion factor should be applied for ICP data as the current recommendation systems are based on colorimetric M&R data.

Phosphorus Measurement; Soil Test Phosphorus; Modified Morgan Phosphorus; ICP; Molybdenum Blue Method

Z. He, H. Zhang, O. Olanya, J. Frantz and R. Larkin, "Differences in Modified Morgan Phosphorus Levels Determined by Colorimetric and Inductively Coupled Plasma Methods," Open Journal of Soil Science, Vol. 2 No. 3, 2012, pp. 256-262. doi: 10.4236/ojss.2012.23030.