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Phosphorus Behavior in Flooded-Drained Soils. I. Effects on Phosphorus Sorption

Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616

*Corresponding author.

ABSTRACT

This study examines the effects of flooding periods (FP), organicmatter (OM) addition, and temperature changes during soil flooding on P sorption in 10 flooded-drained (FD) California soils. The soils were flooded for 0 to 90 d, drained, air dried, and used for P-sorption studies at six (0.3–2.0 mM) initial P concentrations (P_i). Four soils, showing a wide variation in P-sorption capacity, were evaluated for the effects of OM and temperature treatments. Using P-sorption isotherms, a relationship between P sorption and FP was developed for a given final P concentration (P_f) for each soil. Flooding soil without added OM increased P sorption by 10 to 70% in half of the 10 soils. Organic-matter treatment and elevated temperature during flooding further increased P sorption and shortened the FP at which P sorption reached maxima. The soils in which P sorption did not increase without OM treatment were low in either OM or reducible Fe. The largest increase in P sorption as a result of OM and temperature treatments was found in a soil that had low OM but a high level of reducible Fe. These findings suggest that OM and temperature are important factors determining the impact of FD conditions on P sorption.

Contribution from Dep. of Agronomy and Range Science, Univ. of California, Davis.

Received for publication June 9, 1988.

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