Question

Which method of soil testing for available phosphorus is specifically recommended for use in neutral to alkaline (calcareous) soils, as opposed to acidic soils where a different extractant is preferred?

A Bray-1 method (suitable for acidic soils)
B Walkley-Black method (used for organic carbon, not phosphorus)
C Kjeldahl method (used for nitrogen, not phosphorus)
D Olsen's method (sodium bicarbonate extractant, suitable for neutral to alkaline soils)
E Morgan's method, used only for tropical soils
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