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SOIL PHOSPHORUS TEST METHODS CALIBRATION BY FIELD EXPERIMENTAL DATA FOR THE SOILS OF LOW COUNTRY INTERMEDIATE ZONE OF SRI LANKA

Author:

D. M. D. I. Wijebandara

COCOS, LK
About D. M. D. I.
Coconut Research Institute, Lunuwila, Sri Lanka.
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Abstract

Green house studies showed that the 2.5 % Acetic acid (HAc), Olsen's
bicarbonate (0.5 M NaHC03 ) , Anion Exchange Resin (AER) and Anion
Exchange Resin + Cation Exchange Resin (AER + CER) methods were
satisfactory for the estimation of plant available phosphorus (P) of soils of
the Low Country Intermediate Zone of Sri Lanka. The objective of this
study was to calibrate the four extraction methods by field experiments.
Relative yield of Pueraria phaseoloides grown in field on five soil series
treated with and without P fertilizer, but with basal treatment of nitrogen,
potassium and magnesium fertilizer were employed as the plant index for
soil P status. Soil P status of each soil prior to treatment was determined
by the four extraction methods.
The 2.5 % HAc - P values showed the best correlation with relative dry
matter yield of Pueraria by fitting significantly to the Cate and Nelson model
with R2 of 0.628 (P<0.01). Both AER - P and AER + CER- P values
showed the poor correlation with R2 of 0.460 (P<0.05) compared to HAc -
P. NaHC03 -P showed poorest correlation with R2 of 0.449 (P<0.05).

 

The 2.5 % HAc - P was found to be superior to others as it accounted for 62.8
% of the variation of relative yield against 45 - 46 % by the other
extractants. Threshold P levels as determined by the correlation data were
7.8, 3.84, 5.34 and 8.47 mg/kg for 2.5 % HAc - P, AER - P, (AER + CER) -
P and NaHC03 - P respectively. The 2.5 % HAc method was found to be
the most suitable P extraction method for Low Country Intermediate Zone
of Sri Lanka.

How to Cite: Wijebandara, D.M.D.I., (2010). SOIL PHOSPHORUS TEST METHODS CALIBRATION BY FIELD EXPERIMENTAL DATA FOR THE SOILS OF LOW COUNTRY INTERMEDIATE ZONE OF SRI LANKA. COCOS. 16, pp.65–73. DOI: http://doi.org/10.4038/cocos.v16i0.2198
Published on 12 Aug 2010.
Peer Reviewed

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