Abstract
AbstractTo measure the phosphate concentration in the soil solution adjacent to plant roots, a method of isolating the rhizocylinder solution was developed. A major factor in the choice of a method is that it should be rapid and should not alter the solution salt concentration during isolation. The centrifugal filtration method satisfies both conditions for bulk soil samples; it was subsequently applied to the rhizocylinder (roots plus adhering soil). Root sap leaking from corn (Zea mays. L) roots during centrifugation introduced a significant error in the rhizocylinder solution phosphate concentration for a sandy loam with a low solution phosphorus concentration. For two medium‐textured soils with a higher solution P concentration, the error was negligible. The method is considered suitable for the latter soils.
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