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A Study on the Different Forms of Potassium in the Low Ganges River Floodplain Soils of Bangladesh

M. H. Rahman
Central Laboratory, Soil Resource Development Institute, Dhaka-1215

M. M. Farazi
Central Laboratory, Soil Resource Development Institute, Dhaka-1215

M. A. Rahman
Upazilla Agriculture Officer, Mirzapur,Tangail;

M. M. A. Mamun
Central Laboratory, Soil Resource Development Institute, Dhaka-1215

K. Begum
Lecturer, Soil Science, Dhamrai Government College, Dhaka

Abstract/ Executive Summary:

Bangladesh has been divided into 30 Agro ecological Regions (AEZ). Agricultural research, and technology generation and transfer activities have been carried out on this basis. In context of the lack of enough information on different forms of potassium in the soils of the 30 AEZ, an attempt was made to study different forms of potassium of important soils of Bangladesh. As a part of this attempt, an experiment with ten soil samples representing nine different soil series (two of Gopalpur series and one each of Sara, Ishurdi, Ghior, Batra, Sukdebpur, Kumarkhali, Pakuria and Mehendigonj) of the AEZ-12, Low Ganges River Floodplain, was carried out in the Laboratory of the Department of soil science, Bangladesh Agricultural University, Mymensingh to find out the different forms of potassium. The highest value of water soluble potassium (0.08 c mol (+) K g^-1) was obtained in Mehendiganj soil series and the lowest value (0.05 c mol (+) K g^-1) was obtained in Gopalpur-1, 2 and Ishurdi soil series. The highest amount of exchangeable K (0.29 cmol (+) K g^-1) was found in Batra soil series while the lowest (0.13 c mol (+) K g^-1) in Gopalpur-1 soil series. The highest amount of available K (0.35 c mol (+) K g^-1) was found in both Batra and Mehendiganj soil series while the lowest (0.18 cmol (+) K g^-1) in Gopalpur-1 soil series. Considering 0.12 cmol (+) K g^-1 as critical limit (BARC, 2012), all soils had available K above the critical level. The highest amount of non-exchangeable K (4.05cmol (+) K g^-1) was found in Ghior soil series, while the lowest (2.52 c mol (+) K g^-1) was in Mehendiganj soil series.

Keywords: Potassium, Soils, Cation exchange capacity

Location: Department of soil science, Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To clarify the status and different forms of potassium in some soils of the Low Ganges River Floodplain soil.

Methodology:

The experiment was carried out in the Laboratory of the Department of soil science, Bangladesh Agricultural University, Mymensingh to find out the different forms of potassium in the Low Ganges River Floodplain Soils (AEZ-12). The materials used and the methods followed for carrying out the experiment have been described here. Ten soil samples representing nine different soil series; two of Gopalpur series and one each of Sara, Ishurdi, Ghior, Batra, Sukdebpur, Kumarkhali, Pakuria and Mehendigonj series were selected for the present study from the AEZ-12, Low Ganges River Floodplain Soil. The sampling depth was 0-15 cm and the samples were collected from the sadar and Sathia upazila of Pabna, Gurudaspur upazila of Natore Districts. Collected soil samples were air-dried, ground, and passed through a 2 mm sieve and preserved in plastic bottles for subsequent analysis. The weeds, stubbles etc. were removed from the samples before grinding. The <2 μm clay fraction was separated by repeated stirring-sedimentation-siphoning. The 2-20 μm fraction was separated by repeated sedimentation and siphoning, and the 20-53, 53- 212 and 212-2,000 μm fractions were separated by wet-sieving. Weights of each fraction were determined to calculate the particle-size distribution. Soil pH, Electrical conductivity (EC), Cation exchange capacity (CEC), Extractable bases, Water soluble potassium, Exchangeable potassium and Non-exchangeable potassium was determined. Pearson’s correlation coefficient (r) was carried out to find out the correlation among different forms of potassium (water soluble, exchangeable, available and non-exchangeable) by SPSS software.

Source of Information: The Agriculturists 12(1): 140-147 (2014) ISSN 2304-7321 (Online), ISSN 1729-5211 (Print), A Scientific Journal of Krishi Foundation

Article Link (Online Journal): http://banglajol.info/index.php/AGRIC/article/view/19869/13733

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Considerable amount of water soluble and exchangeable K was found in ranges from 0.05 to 0.08 and 0.13to 0.29 cmol (+) K g^-1, respectively in the present study. The available K ranged from 0.18 c mol (+) K g^-1 in Gopalpur-1 series to 0.35 c mol (+) K g^-1 was found in both Batra and Mehendiganj series. The status of available K in the present study was medium according to the classification given by BARC. The highest amount of non-exchangeable K (4.05cmol (+) K g^-1) was found in Ghior soil series while the lowest (2.52 c mol (+) K g^-1) was in Mehendiganj soil series. From the above discussion it is clear that the concentration of different form of K in soil vary with clay contents as its mineralogical makeup. Therefore, the idea of management of K can be taken from the mineralogical composition of that soil.

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