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Ammonium Fixation in Some Bangladesh Soils

Dr. S. M. lmamul Huq
Professor
Department of Soil Science, University of Dhaka, Bangladesh

A. lslam
Department of Soil Science, University of Dhaka, Bangladesh

M. H. Rashid
Department of Soil Science, University of Dhaka, Bangladesh

Abstract/ Executive Summary:

The soils varied appreciably from one another in fixing added ammonium and it ranged from 0.00 to 181.96lbs/A in the surface and 21.24 to 165.52lbs/A in the sub-surface" layers. Soils containing illitic mineral fixed the highest amount of ammonium followed by soils containing vermiculite while, kaolinite containing soils fixed the leas t. Soils containing montmorillonite fixed appreciable amount of added ammonium. Multiple correlations co-efficient between ammonium fixation and the sand, silt, and cla y content s; pH; organicc matter contents; exchangeable ammonium and CEC of the soils was + 0.58 (0.05). A linear relationship was obtained between ammonium and potassium fixation, the equation being y = 34.68 + 1.17x, where, y is the amount of ammonium fixed in lbs/A and x is the amount of potassium fixed in lbs/ A.

Keywords: Soil, pH; Organic matter contents, Exchangeable ammonium

Location: Department of Soil, Water and Environment, University of Dhaka.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To identify the Multiple correlations co-efficient between ammonium fixation and the sand, silt, and clay contents; pH; organic matter contents; exchangeable ammonium and CEC of the soils and to linear relationship between ammonium and potassium fixation

Methodology:

The soils included in the study represented six soil series of Bangladesh at two different depths (0-15 and 15-30 cm from surface) varying in their physical and chemical, properties. Mechanical analyses of the soils were done by hydrometer method as outlined and the textures were determined by using a pye glass electrode pH meter at a soil: water ratio of 1 : 2.5. The CEC was determined by using neutral N NH₄0Ac as described. Organic matter of the soils were determined volumetrically by wet- oxidation method of Walkely and Black. Exchangeable NH₄⁺ was extracted with 10% acidified NaCI (pH_2.5 ) solution and determined by steam distillation. Ammonium fixation was studied with modification of the method described. 10 ml of NH₄ CI solution containing 125 ppm of NH₄⁺-N (equivalent to 250.00 lbs/A) was added to 10g of each soil. The soils were then subjected to alternate wetting and drying (24 hrs each of drying and wetting) cycles over a period of 10 days. The drying was done on a water bath at a temperature of 70°C. The ammonium was extracted with neutral N KCI solution. Freshly treated samples of the same soils were immediately extracted with neutral N KCI solution. The difference of the amounts of ammonium between these two soils were taken as the amount of ammonium fixed by the soils during that period.

Source of Information: J. Asiatic Soc. Bangladesh (Sc.) 3(2) : 19-26, 1978.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The soils varied greatly (LSD= 2.059 at 1 % level) from one another in fixing added ammonium, ranging from 0.00 to 181.961bs/A in the surfaces and 21. 24 to 1 65.52 lbs/A in the subsurface layers of the soils studied. When considered as per cent of the added ammonium the corresponding values were 0.00 to 72.78 and 8.50 to 66.21 respectively. The soils fixed in general higher amounts of the compound in the surface than the sub-surface layers except in the Tejgaon and Demra series. It is of interest to note that the Tejgaon series which failed to fix any ammonium in its surface, fixed 21.24 lbs/A in the subsurface. It was, therefore, concluded that ammonium fixation was caused not only by the clay minerals alone as in the case of potassium but also by the organic matter reserve of the soils as well.

Knowledge Management: Journal