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Spatial Variability of Phosphate Adsorption Parameters

Department of Soil Science and Plant Nutrition, Wageningen Agric. Univ., De Dreijen 3, 6703 BC Wageningen, the Netherlands.

^* Corresponding author.

ABSTRACT

Reversible phosphate (designated P) adsorption for acid soils with a narrow pH range is described with the Langmuir kinetics equation. Using a combination of two experimental desorption techniques, i.e., desorption in water and desorption in the presence of an "infinite" sink for P, respectively, the adsorption maximum (Q_m) and the adsorption constant (K) were assessed for soils (pre-)saturated with P. The adsorption maximum was proportional with the sum of oxalate-extractable Fe and Al (ME) (i.e., Q_m 0.135 ME), for topsoil samples from a field and a watershed. The K values found for the field and for the watershed samples were in the same order of magnitude (K = 15–25 L mmoL^–1). The adsorption maximum and the adsorption constant, as well as the amounts of P desorbed, were spatial variates. The distributions were fitted to the normal as well as the lognormal distribution at the significance level of 0.05, using the Kolmogorov-Smirnov test statistic.

Contribution from the Wageningen Agric. Univ., Wageningen, the Netherlands.

Received for publication November 17, 1987.

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