COMPARISON OF AL P AND OLSEN P TEST IN CALCAREOUS SOILS IN CROATIA

Abstract

The purpose of this article was to compare soil P extraction by sodium bicarbonate solution (Olsen P) and by ammonium lactate (AL P) in calcareous soils in Croatia and to create a model for predicting AL P values using the correlation of these soil tests and common soil analysis data in Croatia. Soil samples were collected, near Opuzen city, in the valley of the River Neretva, in 2005. The results of these studies confirmed significant correlation between soil P extracted by Olsen (NaHCO3) and by ammonium lactate (AL P) solution in calcareous soils from the Neretva river valley. The developed model is useful for providing fertilizer recommendations based on AL P soil-test results from Croatian soils using existing ammonium lactateextractable P calibration expecially for the calcareous soils in Croatia in the valley of the Neretva River.

Keywords

• AL P
• Olsen P
• phosphorus
• calcareous soil
• model