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Distribution of Sulphur in Acid Soils, Lakkatura Tea Garden, Sylhet

M.R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh

H. Afroz
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh

M.M. Parvin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh

F. Yesmin
Department of Agricultural Extension & Rural Development, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M.M. Hoque
Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet, Bangladesh.

Abstract/ Executive Summary:

A study was undertaken with soils collected from four locations of Lakkatura Tea Garden, Sylhet to evaluate the distribution of S and its relationship with soil properties. The soil samples were collected from two depths, 0-15 cm and 15-30 cm covering 0 year, 20 year, 40 year and 60 year tea cultivated soils. The soil samples were analyzed for various S fractions including total S, organic S, inorganic S and available S. The available S in soils was extracted with four different extractant viz. MCP (500 ppm P), NH₄OAc (0.5M), CaCl₂ (0.15%), NaH₂PO₄ (in 2N acetic acid). Different S fractions showed a variation in their levels and also showed a decrease in subsurface soils. The total S content varied in different aged tea soils ranging from 506.53 to 661.20 ppm at 0-15 cm depth but at 15-30 cm depth it varied from 404.07 to 624.60 ppm in different tea cultivated soil. The highest total S content of 661.2 ppm was found in 0 year age tea soil and the lowest value of 404.06 ppm was found in 60 year age tea cultivated soil. The highest organic S content of 127.41 ppm was found at 0-15 cm depth in 0 year tea cultivated soil and the lowest value of 67.28 ppm was found in 60 year tea cultivated soil. The inorganic S content of soils varied from 410.83 to 543.46 ppm at 0-15 cm depth and from 336.79 to 532.83 ppm at 15-30 cm. The organic and inorganic S constituted on an average 17.52% and 82.92% of total S, respectively. The available S content of soils varied considerably with the variation of soils and extractant used. The highest content of available S was observed in 0 year age tea cultivated soil with all the extractant while the 60 year age tea cultivated soil showed the lowest value. Among all the extractants MCP gave the highest available S while NaH₂PO₄ gave the lowest values. The mean value of S extracted by different extractant followed the order of MCP> NH₄OAc> CaCl₂> NaH₂PO₄.

Keywords: Sulphur distribution, Acid soils, Sulphur extractants, Tea Garden

Location: Lakkatura Tea Garden, Sylhet

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Tea, Fertilizer

Objectives:

To determine the distribution of different fractions of S and the relationship of these fractions with soil properties in different aged tea soils of Lakkatura tea Garden, Sylhet.

Methodology:

The study was undertaken with some soils collected from the Lakkatura Tea Garden, Sylhet. The soils belong to the Agro-ecological Zone 20, Eastern Surma-Kushyara Floodplain. Soil samples were collected from four different age group of tea crop grown for 0 year, 20 year, 40 year and 60 year in Lakkatura Tea Garden, Sylhet. Twenty four composite soil samples were collected from the sampling sites at two different depths of 0-15 cm and 15-30 cm. The collected soil samples were carried to the laboratory, air dried at room temperature, mixed thoroughly, crushed, sieved with a 10-mesh sieve. Total sulphur content was estimated by acid digestion method as per procedure given by Tabatabai, 1982. For determining organic sulphur the soil sample was ignited with NaHCO₃ at 500ºC for 3 hours in an electric furnace and then S was extracted with NaH₂PO₄ solution in 2N acetic acid (Bradsley and Lancaster, 1960). Inorganic sulphur was calculated by subtracting organic sulphur from the total sulphur. Available S of the soil was extracted by four different extractants. S in the extract was determined turbidimetrically using spectrophotometer (Jenway 6300). Particle size analysis of soil was done by hydrometer method (Bouyoucos 1927) and the textural class was determined by plotting of the values for %sand, %silt and %clay to the Marshall’s Triangular Coordinate following the USDA system. Organic matter was determined by Walkley and Black method (Walkley and Black, 1934). The soils were also analyzed for pH (1:2.5 soil-water) by glass electrode pH meter method (Michael Peech 1965), total N by Semi- micro Kjeldahl method (Bremner and Mulvaney, 1982), available P by Olsen method (Olsen et al. 1954), exchangeable K by Flame Photometer after extraction with 1N NH₄OAc at pH 7.0 (Knudsen et al. 1982) and CEC (Chapman 1965). Simple correlation values were calculated to determine the relationship between sulphur fractions and soil parameters.

Source of Information: J. Soil Nature 7(1):13-18 (March 2014)

Article Link (Online Journal): http://ggfjournals.com/e-journals archive

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The overall results indicate that the status of various S fractions varied from soil to soil and in some soils the level of available S recorded only a small portion of the total S (1.1%) indicating the existence of P deficiency. The inorganic S content of soils was low in comparison with organic S in different soils. The highest content of available S was observed in 0 year tea cultivated soil estimated with all the extractant. The 60 year round tea cultivated soil showed the lowest available S determined with all the extractant. Therefore, proper management practices with S fertilization are needed for tea cultivation in Lakkatura Tea Garden.

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