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Potassium Releasing Power of Some Benchmark Soils of Bangladbsh

M. Q. Haque
Bangladesh Institute of Nuclear Agriculture P. O. Box 4, Mymensingh

M.I.Ali
Bangladesh Institute of Nuclear Agriculture P. O. Box 4, Mymensingh

A. Islam
Department of Soil Science, University of Dhaka.

S. Hoque
Department of Soil Science, University of Dhaka.

Abstract/ Executive Summary:

Potassium release behaviour of 15 selected soils of Bangladesh was studied. The release of K as determined by two extraction methods indicated that the amount of K continued to decrease with the successive extractions. The rate of K release was always higher with IN NH₄OAc than with 0.3N NaCl extraction in all soil series under study. The cumulative amount of K released by two extraction methods was very low despite a very high total K content in the soils. The two K extraction methods were highly and positively correlated with each other. The K extraction methods also showed highly significant correlation with percent clay and CEC.

Keywords: Potassium releasing power, Benchmark soils of Bangladesh, Extraction method

Location: Bangladesh Institute of Nuclear Agriculture , Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To assess the K releasing power of fifteen benchmark soils of Bangladesh.

Methodology:

Soil samples were collected from widely occuring and intensively cultivated soil series of major agroecological zones (AEZ) of Bangladesh. The soil series and also their important characteristics are reported . The soil samples were characterized by standard chemical procedures. Water soluble and exchangeable K were determined by shaking 5g soil for 30 minutes with 50 ml distilled water and 1N neutral ammonium acetate, respectively (Hanway and Heidal, 1952). Non-exchangeable K was determined by two methods using 1.4 N H₂SO₄(Hunter and Pratr, l9S7) and 1N HNO₃ with 10 minutes boiling (Wood and De Turk, 1940). Soil samples were digested with HF-HC104 for the determination of total potassium (Pratt, 1968). Potassium release behaviour was measured by 1 N NH₄OAc (Pratt, 1965) and also by 0.3 N NaCl (Quirk and Chute, 1968). In both methods, 59 soil sample was shaken with 50 m1 of extracting solution for 24 hours and the amount of K in the K of supernatant was determined by Flame Photometer. The extraction in both methods was repeated until plateau was reached.

Source of Information: Bangladesh J. Nuclear Agric. 11 : 9-17, 1995

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The rate of K release was always higher with IN NH₄OAc than with 0.3N NaCl extraction in all soil series under study. The cumulative amount of K released by two extraction methods was very low despite a very high total K content in the soils. The two K extraction methods were highly and positively correlated with each other. The K extraction methods also showed highly significant correlation with percent clay and CEC.

Knowledge Management: Journal