Experiences with the modified Baker-Amacher soil extraction procedure in Hungary

István Jászberényi, Béla Kovács, Jakab Loch

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The Baker and Amacher equilibrant and extractant with PO4-P addition seems to be useful for measuring not only K and Mg requirements but also for testing P adsorption of soils as single-point isotherms. The correlations between CaCl2-P (readily desorbed P) and mBA dP (adsorbed P) quantities showed different P adsorption hysteresis in soils. The trend of adsorbed P amounts, measured in soils from long-term fertiliser experiments, strengthened our early experiences. Differences of P, K and Mg sorptions were measured in buffered and unbuffered mBA equilibrants. While sorption in the unbuffered mBA equilibrant is theoretically closer to field processes, the K and Mg requirements in unbuffered mBA seem to be overestimated. This has to be taken into account during calibration.

Original languageEnglish
Pages (from-to)2125-2134
Number of pages10
JournalCommunications in Soil Science and Plant Analysis
Issue number11-14
Publication statusPublished - Jan 1 2000

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

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