Extractable phosphorus related to forms of phosphorus and other soil properties

Journal of the Science of Food and Agriculture - Tập 23 Số 12 - Trang 1425-1433 - 1972
Matt K. John1
1Canada Department of Agriculture Agassiz, British Columbia, Canada

Tóm tắt

AbstractThe soil P extracted by Olsen's, Bray's P‐1, Morgan's, North Carolina, 0.01M‐CaCl2, acidic N‐ammonium acetate and isotopic‐exchange methods of determining available P were related to the forms of soil P and to other soil properties. Correlations between soil tests were higher when both test values were well correlated with a common P form, thereby indicating their similarity in selective dissolution of specific forms. Linear regression equations derived by stepwise inclusion of significant independent variables in order of importance for explanation of variations in soil‐test values, indicated that the greatest contribution to Olsen's or Bray's test values was aluminium‐P, to the isotopic exchange P was iron‐P and to North Carolina test values was calcium‐P. Dithionite‐extractable aluminium and iron, organic matter, soil texture, base saturation and soil reaction were included in regression equations to reflect their significant influence on the dissolution of specific P forms and secondary reactions occurring during the extraction process. Based on observations for 343 differing soils, regression equations to predict soil‐test values from significant P forms and soil properties accounted for more than 50% of variations in P soil‐test values for Olsen's, Bray's, North Carolina and 0.01 M‐CaCl2 extraction methods. No improvement was found when P forms were included regardless of significance and significant soil properties were added to the regression equations.

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Tài liệu tham khảo

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Thông tin xuất bản

Journal of the Science of Food and Agriculture

Tập 23 Số 12

1425-1433

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