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Potassium Status and Release Behaviour of Five Selected Soil Series of Bangladesh

M.Q. Haque
Department of Soil Science, Dhaka University, Dhaka, Bangladesh.

A. Islam
Soil Science Division P.O. Box No.4, BINA, Mymensingh

S. Hoque
Soil Science Division P.O. Box No.4, BINA, Mymensingh

M. I. Ali
Department of Soil Science, Dhaka University, Dhaka, Bangladesh

Abstract/ Executive Summary:

Studies on the status of soil K and release pattern in five selected soil series of Bangladesh were conducted. Ammonium acetate extractable K values ranged from 0.26 to 0.77 mery'. and these values were above critical level (0.2 me%). Non-exchangeable K determined by 1.4 N H₂S0₄ and 1 NHN0₃ (boiling for 10 minutes) methods ranged from 0.40 to 0.97 and 0.64 to 1.33 me%, respectively. For all soil series K extracting power of the extractants were in the descending order of N HN0₃> 1.4 N H₂S0₄> 1 N NH₄0Ac> water soluble K (soil: water ratio was 1:10). Water soluble K had a positive correlation with 1 N NH₄0Ac and 1.4 N H₂S0₄ extractable K (r=0.98, p=O.Ol; 0.71 (NS), respectively. On the other hand exchangeable K showed a significant positive correlation (r=0.80, p=O.OS, with 1.4 N H2S04 extractable K. Moreover, 1 N HN0₃ extractable K showed positive correlation with water soluble, exchangeable and 1.4 N H₂S0₄ extractable K. Rate of release of K by two methods have been indicated that the amount of K continued to reduce in subsequent extraction by both the methods. The efficiency of the rate of K release was always more by 1 N NH₄0Ac extraction than by 0.3N NaCl extraction in all soil series under study.

Keywords: Soil, K, Bench mark soil, Soil series

Location: Agroecological Zones (AEZ) of Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine the K status and K release behavior of five bench mark soil series of Bangladesh.

Methodology:

Soil samples were collected from widely occurring and intensively cultivated soil series from five Agro ecological Zones (AEZ) of Bangladesh. The soil series were Barura, Nunni, Phagu, Pirojpur and Taras. The general characteristics of the soil series of Agro ecological Zones of Bangladesh. The soil samples were characterized by standard chemical procedures. Cation exchange capacity was determined by a method. Water soluble K and exchangeable K were determined by shaking 5g soil for 30 minutes with 50 ml distilled water and IN neutral ammonium acetate, respectively. Non-exchangeable K was determined by two methods using 1.4 N H₂S0₄ and 1 N HN0₃ with 10 minutes boiling. Soil samples were digested with HF-HC104 for the determination of total potassium. Potassium release behaviour was measured by 1 N NH₄0Ac, and 0.3N NaCI. In both methods, 5g soil samples were shaken with 50 ml respective extracting solution for 24 hours and K of supernatant was determined by Flame photometer. The extraction (in both cases) was repeated until plateau was reached.

Source of Information: Proceedings of Commission IV Conference, Dhaka

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the physical, chemical and physico-chemical properties of 5 soil series under study. Chemical analysis of the soil samples showed a wide variability in various soil properties. Concentration of the various forms of potassium determined by chemical methods. In general water soluble potassium ranges from 0.04-0.21 me% with a mean value 0.10 me%. A high amount of water soluble potassium were recorded in the Pirojpur (0.21 me%) and Taras (0.12 me%) soil series, respectively. The rest three soil series contained low values of water soluble K which ranged from 0.04 to 0.08 me%, respectively. These results are in good agreement with those reported earlier. Water soluble K showed a positive correlation with N-NH₄0Ac and I.4N H₂S0₄ extractable K (r=0.98, p=O.OI; 0.71 (NS), respectively. On the other hand exchangeable K showed a significant positive correlation (r=0.80, p=O.OS, with 1.4 N H₂S0₄ extractable K. Moreover, 1 N HN0₃ extractable K showed positive correlation with water soluble, exchangeable and 1.4 N H₂S0₄ extractable K. Rate of release of K by two methods have been indicated that the amount of K continued to reduce in subsequent extraction by both the methods. The efficiency of the rate of K release was always more by 1 N NH₄0Ac extraction than by 0.3N NaCl extraction in all soil series under study.

Knowledge Management: Report/Proceedings