Comparison of Two Soil Phosphorus Analytical Methods in Croatia

• Published in: Communications in soil science and plant analysis Vol. 37; no. 15-20; pp. 2867 - 2881
• Main Authors: Lončarić, Zdenko, Popović, Brigita, Teklić, Tihana, Engler, Meri, Karalić, Krunoslav
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01-06-2006; Taylor & Francis
• Subjects: Agronomy. Soil science and plant productions; Ammonium lactate; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Olsen; phosphorus; soil P tests; Soil science; Soil-plant relationships. Soil fertility; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Southern Europe; Balkan Peninsula; Europe; Croatia; Soils; Olsen; Soil fertility; Analytical method; Phosphorus; model; soil P tests; Modeling; Ammonium lactate
• ISSN: 0010-3624; 1532-2416
• DOI: 10.1080/00103620600832845

The purpose of this article was to compare soil phosphorus (P) extraction by sodium bicarbonate solution (Olsen P) and by ammonium lactate (AL P) and to create a model for prediction of Olsen P using ordinary soil-fertility control data. The soils data used in this study included Olsen P, pH
KCl
, pH
H2O
, organic matter, AL P, and AL K. Soil pH
KCl
ranged from 3.5 to 8, organic matter up to 5%, AL K up to 400 mg kg
−1
, and AL P up to 200 mg kg
−1
. Olsen P and AL P were significantly correlated, and the difference between them was influenced by soil pH. Regression models included all soil data grouped by soil pH range, which significantly decreased the difference between predicted and measured Olsen P. The validation of the model was conducted on new data sets from field fertilization trials. The results show that Olsen P can be related to AL P and used for fertilizer recommendations instead of AL P.