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Potassium Status of Some Selected Soils of Bangladesh

Md. Quamrul Haque
Bangladesh Institute of Nuclear Agriculture, PO Box No. 4, Mymensingh, Bangladesh

M. Idris Ali
Bangladesh Institute of Nuclear Agriculture, PO Box No. 4, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Soil samples from 15 widely occurring and intensively cultivated soil series of Bangladesh were examined for their potassium status. Ammonium acetate extractable K was found to be in medium range (0.16-0.30 me%) in Burichong, Ajmiriganj and Baliadangi Soils and the K values were below critical level (K <.15 m.e.%) in rest of the soils. Non-exchangeable K determined by JAN H₂S0₄ ranged from 0.13 to OA6m.e.% and from 0.23 to 3.24 m.e.% when determined by IN HN0₃ (boiling for 10 minutes) method.For all soil series, K extracting power of the extractants were in the decreasing order of JN HN0₃1AN H₂S0₄1N NH₄0Ac 1:10 water (1.03 0.230.14 0.01me%).Exchangeable K (IN NH₄0Ac) showed a significant correlation with JAN H₂S0₄ extractable K (r = 0.53).17K relationship between exchangeable K and IN HN0₃ extrac table K was not, however, significant.

Keywords: Soil, Potassium, Soil series, Soil fertility

Location: The soil series are Chandina, Tippera, Debidwar, Burichong, Goyainghat, Ajmiriganj, hadimnagar, Jaflong, Pritipassa, Mirsharai, Karnafuli, Sara, Baliadangi and Gongachara of Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To evaluate the amount of different forms of soil potassium (soluble, exchangeable and non-exchangeable) and their relationship in 15 widely occurring and intensively cultivated soil series of Bangladesh.

Methodology:

Fifteen soil samples were collected from widely occurring and intensively cultivated soil series of Bangladesh.The soil series are Chandina, Tippera, Debidwar, Burichong, Goyainghat, Ajmiriganj, hadimnagar, Jaflong, Pritipassa, Mirsharai, Karnafuli, Sara, Baliadangi and Gongachara. The soil samples were characterised by standard Chemical Techniques. Cation exchange capacity was determined by a method as described. Water soluble K and exchangeable K were determined by shaking 5 gm of soil for 30 minutes with 50 ml distilled water and with 1N neutralllmmonium acetate, respectively. Non-exchangeable K were determined by two methods using 1.4N H₂S0₄ and 1N HN0₃ with 10 min. boiling.

Source of Information: Bangladesh Journal of Soil Science, Vol.-21, No.-01, June 1990, ISSN 0253-5440

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Chemical analysis of the soil samples showed a wide variability in various soil properties including potassium. In general water soluble potassium ranges from 3.0 to 7.0 ppm with a mean value of 4.53 ppm. Exchangeable K (lN NH₄0Ac extract) were below critical level (0.15 m.e.%) in 10 out of 15 soil series.The highest values for exchangable k of 0.30 me% was recorded in Karnafuli soil and this was followed by medium level of exchangable K of 0.25 and 0.21 me% in Burichong and Ajmiriganj soil series, respectively. The lowest value for ex changeable K of 11.07 me% was obtained in Chandina soil. Similar values for exchange able K were reported. Non- exchangeable K ranged from 0.13 to 0.46 me% (1.4N H₂S0₄ extract) and 0.23 to 3.24 me% (1N HN0₃ extract with 10 min boiling) having mean values of 0.23 and 1.03 me% respectively. A wide variability in the non-exchangeable K values among the soil types. The non- exchange able K extracted by lN NH0₃ was highest in Gongachara soil (3.24 me%) followed by Sara (2.79 me%). On the other hand significant quantities of non-exchangeable K was extracted by 1.4N H₂S0₄ method from Karnafuli series (0.46 me%) followed by Gongachara series (0.40 me%). Exchange able (lN NH40Ac) K shows a significant correlation (r = 0.53) with K extracted by 1.4N H₂S0₄. The relationship of exchange able K with 1N HN0₃ soluble K was not significant (r = 0.043). Lack of significant relationship between exchangeable K and HN0₃ extractable K could be due to variation in artifact in the extraction procedure. Total K content ranges from 11.33 - 79.41 me%. The highest total K content was79.41 me% in Gongachara soil which was fol lowed by 71.83 me% in Baliadangi soil. The lowest value for total K (11.33 me%) was ob tained in Khadimnagar soil and the next lowest content of total K of 23.66 me% was found in Jaflong soil series. The total K values for Rangamati soil (30.18 me%) and for Pritirnpassa soil (36.82 me%) were also not as high as compared to other soils under study. Results revealed that most of the other soils need adequate supply of K fertilizer for successful sustainable crop production.

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