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Abstract
The Baker and Amacher equilibrant and extradant 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.