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Published in Soil Sci. Soc. Am. J. 69:511-521 (2005).
© 2005 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA

Division S-8—Nutrient Management & Soil & Plant Analysis

Ion-Sink Phosphorus Extraction Methods Applied on 24 Soils from the Continental USA

R. G. Myersa, A. N. Sharpleyb, S. J. Thiena and G. M. Pierzynskia,*

a Dep. of Agronomy, Throckmorton Plant Sciences Center, Kansas State Univ., Manhattan, KS 66506
b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702

* Corresponding author (gmp{at}ksu.edu)

Ion-sink methods, such as resin membranes or FeO coated strips or filter papers, have been used as soil tests for plant available P. We have standardized a resin procedure and compared extractable soil P with the FeO method for 24 soils from the continental USA. Bray-1 extractable P ranged from 0.3 to 221 mg kg–1 and Olsen's extractable P ranged from 1.4 to 131 mg kg–1 across all soils. We used anion resin membrane strips (RS) and traditional loose resin (LR) to extract soil P. Total surface area of one RS was 17.3 cm2, compared with 47.5 cm2 for one FeO-coated filter paper. We used one, two, or three RS saturated with bicarbonate (RSbic) or chloride (RSCl), along with 1.5 g of moist LR saturated with either bicarbonate (LRBic) or chloride (LRCl). Using LRBic, the mean P was 64.3 mg kg–1 compared with 52.5 with one RSBic, 55.2 with two RSBic, and 63.9 with three RSBic. Using LRCl, the mean P was 63.2 mg P kg–1 compared with 48.7 with one RSCl, 54.8 with two RSCl, and 57.3 with three RSCl. The mean FeO-P was 36.4 mg kg–1. Resin (Cl) hardly influenced pH of the extracting solution, LRBic and RSBic influenced pH most, and FeO-strips had an intermediate effect on solution pH. This study shows that RS with a total surface area of 51.8 cm2 can be used to extract soil P in place of more time-consuming LR methods.

Abbreviations: AEM, anion exchange membrane • epm, excursions per minute • LR, loose resin • LRBic, LR saturated with HCO3– • LRCl, LR saturated with Cl– • RS, resin strips • RSBic, RS saturated with HCO3– • RSCl, RS saturated with Cl–






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