NDLI: A critical assessment of methods for determining organic phosphorus in savanna soils

Content Provider	Springer Nature Link
Author	Agbenin, J. O. Iwuafor, E. N. O. Ayuba, B.
Copyright Year	1999
Abstract	Two newly introduced extraction techniques for determining total organic P (P0) were compared with the standard high-temperature ignition method in selected savanna soils of Nigeria. The two extraction techniques were: (1) concentrated H2SO4 and dilute base sequential extraction (18 N H2SO4 and 0.5 N NaOH) and (2) basic EDTA method (0.25 M NaOH plus 0.05 M Na2EDTA). The concentrated H2SO4 and dilute base method extracted significantly higher total P0 than the high-temperature ignition method and the basic EDTA extraction. The high-temperature ignition and the basic EDTA extraction gave similar total P0 values (mean=91 mg kg–1 for ignition and 90 mg kg–1 for basic EDTA). The precision of the methods, determined by coefficients of variation (CV, %) associated with each P0 determination method in the soils, was better for the concentrated H2SO4 and dilute base extraction method (CV=13%) than the ignition method (CV=18%) and the basic EDTA method (CV=15%). The high C : P0 ratios determined for the high-temperature ignition and basic EDTA extraction indicated that the two methods underestimated total P0 in the soils. The concentrated H2SO4 and dilute base sequential extraction appears to be suitable for the rapid determination of P0 in savanna soils because the method can be simplified to a single-step analysis.
Starting Page	177
Ending Page	181
Page Count	5
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	28
Issue Number	2
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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