Evaluation of Selected Phosphorus Soil Tests for Lettuce on Histosols

C. A. Sanchez, E. A. Hanlon

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The University of Florida's Soil Testing Laboratory for organic soils has beenusing a water-extracable P soil test since 1944. This test was selected because of its reliable correlation with response of vegetable-crop commodities produced on Histosols. However, this soil test has not consistently provided reliable correlations for agronomic crops which have a longer growing season. In the interest of calibrating an extractant for both horticultural and agronomic crops, and possibly accomplish progress toward the use of a more universal extractant for all Florida soils, data from four field experiments were used to evaluate several extractants as alternatives to the water P test currently used. Lettuce (Lactuca sativa L.) was used as the test crop and the extractants evaluated were, the sodium bicarbonate, ammonium bicarbonate-DPTA, EDTA, Mehlich-I, and Mehlich-III soil test. Overall, no extractant provided superior correlations to lettuce response than the water P test. However, the M-III extractant produced correlations that were similar to water and further evaluation of this extractant as a P soil test for Histosols is warranted.

Original languageEnglish (US)
Pages (from-to)1199-1215
Number of pages17
JournalCommunications in Soil Science and Plant Analysis
Issue number13-16
StatePublished - Aug 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science


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