
TY  - JOUR
A1  - Poile, GJ 
A1  - Ring, SM 
A1  - Conyers, MK 
A1  - Slattery, WJ 
T1  - The influence of centrifuging on phosphorus (Olsen P) soil test values
JF  - Soil Research
JO  - Soil Res.
Y1  - 1990
VL  - 28
IS  - 4
SP  - 559
EP  - 562
KW  - 
UR  - https://doi.org/10.1071/SR9900559 
N2  - Variation in soil Olsen P tests can arise from the method of separation of the solution extract from the soil. With increasing centrifugation of the NaHC03 extract solution, we observed a decline in solution P values and these approached the P values obtained on soil-filtered extracts. The decline in solution P with increasing centrifugation was associated with a decline in organic carbon in the NaHC03 solution. We caution against unpublished modifications to methods and recommend that for consistency, simplicity, speed and cheapness, the NaHCO3 extract be soil-filtered as in the original method. 
ER  -

