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Published in Soil Sci Soc Am J 46:335-338 (1982)
© 1982 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Residual Available Phosphorus in Near-Neutral and Alkaline Soils: II. Persistence and Quantitative Estimation1

P. E. Fixen and A. E. Ludwick2

ABSTRACT

A continuous cropping greenhouse study of 28 Colorado soils with phosphorus (P) rates of 0 and 30 ppm was conducted. The objectives were to (i) evaluate the persistence of residual available P in near-neutral and calcareous soils and (ii) to predict its quantity. Residual available P was defined as the amount of P removed fron soil by plant uptake until the NaHCO3-P level dropped to 10 ppm.

A residual effect of the fertilizer treatment persisted beyond six greenhouse crops for nearly one-half of the 28 soils. Recovery of applied fertilizer ranged from 47 to 119% and averaged 74%. The following equation was developed to predict the quantity of residual available P in soils: Residual P, mg/2 kg soil = –17.02 + 2.062 (NaHCO3-P, ppm) + 0.058 (NaHCO3-P x clay, %) – 0.187 (lime, % x clay). R2 = 0.90; 55 soil treatment combinations.

NOTES

1 Published as Scientific Series Paper no. 2,656 of the Colorado State Univ. Exp. Stn. This research was supported in part by the Soils and Fertilizer Research Branch, TVA, Muscle Shoals, AL 35660.

2 Former Graduate Research Assistant and former Professor, Dep. of Agron., Colorado State Univ., Fort Collins, CO 80523. Authors are presently Assistant Professor, Dep. of Plant Science, South Dakota State University, Brookings, SD 57007, and Western Director, Potash & Phosphate Inst., Davis, CA 95616.

Received for publication June 25, 1981. Accepted for publication September 14, 1981.






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Copyright © 1982 by the Soil Science Society of America.