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The Olsen P/solution P relationship as affected by soil properties
Author(s) -
SánchezAlcalá I.,
del Campillo M. C.,
Barrón V.,
Torrent J.
Publication year - 2014
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12141
Subject(s) - soil water , chemistry , zoology , mineralogy , mathematics , soil science , geology , biology
Little attention has so far been given to the relationship of Olsen P to solution P at P levels in the soil solution within the range relevant to plant growth. In this work, we investigated the relationship between these two P forms in 24 noncalcareous and 25 calcareous Spanish soils, using the concentration of P in the 0.01 m CaCl 2 extract (1:10 soil:solution ratio; 30 min shaking) as a proxy for the P concentration in the soil solution. Application of the Freundlich equation ( y = ax b ) in linearized form provided a parsimonious, largely accurate description of the Olsen P/CaCl 2 ‐P relationship. The average value of exponent b , 0.53, suggests that Olsen P relates to the quantity of P in soil rather than to its intensity. The estimated Olsen P values at a CaCl 2 ‐P concentration of 0.01 and 0.03 mg/L (viz., Olsen P 0.01 and Olsen P 0.03 , respectively) varied over wide ranges (0.6–33.9 and 2.0–38.9 mg/kg, respectively). Based on the results of a regression analysis, silicate clays, carbonates and, especially, Fe oxides contribute positively to Olsen P 0.01 and Olsen P 0.03 . The fact that, as shown here, Olsen P at a specific solution P concentration can be predicted from easily measured soil properties can facilitate decision‐making in managing fertilizer P.