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Comparisons of Arithmetic Average Soil pH Values with the pH Values of Composite Samples¹

ABSTRACT

Close agreement was found between arithmetic mean pH values of limed samples and the pH values of composited samples. Agreement was consistently and considerably poorer when pH values were converted to H-ion activities [(H⁺)] before averaging. Results are explained by the greater linearity between soil pH and base saturation (BS) in the acid range of mineral soils than between (H⁺) and BS. Linearity can be assessed by comparing average pH values with those of composited samples.

¹ Contribution from the College of Agric. Res. Center, Washington State Univ., Pullman, WA 99164. Project 1999, Scientific Paper no. 5769.

² Soil Scientist and Assistant Soil Scientist, respectively, Western Washington Research and Extension Center, Puyallup, WA 98371.

³ Research Associate, Dep. of Agron., Iowa State Univ., Ames, Iowa 50010.

Received for publication November 3, 1980. Accepted for publication March 19, 1981.

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