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Survey of the Nutrient Status of the Areas Under Tea in Manu-doloi Valley Circle of Sylhet Region

S.H. Chaudhury
Principal Scientific Officer
Chemistry-Meteorology Division,Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar

K.M. Shome
Assistant Scientific Officer
Chemistry-Meteorology Division,Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar

M.A. Rahman
Assistant Scientific Officer
Chemistry-Meteorology Division,Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar

A.K.M. Golam Kibria
Assistant Scientific Officer
Chemistry-Meteorology Division,Bangladesh Tea Research Institute, Srimangal-3210, Moulvibazar

Abstract/ Executive Summary:

The survey was conducted in the twelve tea estates of Manu-Doloi valley circle to find out the correlation between the yield of tea and soil properties of the existing tea gardens of Manu-Doloi valley circle in Sylhet region during 1964-74. A total of 141 soil samples were collected and analysed for mechanical separates, organic carbon, total nitrogen, lime, magnesia, potash, phosphorus, available phosphorus, potassium, nitrogen and organic matter. The results revealed that loss of organic matter and nitrogen contents are the causes of poor growth, low yield and also failure of tea to produce expected results. The average C/N ratio in the surface soils ranges from 8.3 to 18.3 and in some cases appeared to be the limiting factor for satisfactory growth and yield. Lime content of most of the soils is much less than the optimum limit of the range required for good tea soils. 0.0036% of available phosphorus and 0.0098% of available potash in the surface soils may be regarded as the minimum standard for good tea soils of Manu-Doloi valley circle. For soils of low yielding sections the requirement will be less.

Keywords: Nutrient status, Tea, Yield, Manu-Doloi valley circle

Location: Different tea estates of Manu-Doloi valley circle of Sylhet region

Start Date: 00-00-1964

End Date: 00-00-1974

Program Area: Crop-Soil-Water Management

Commodity: Tea

Objectives:

To find out the correlation between the yield of tea and soil properties of the existing tea gardens of Manu-Doloi valley circle in Sylhet region

Methodology:

Twelve tea estates of Manu-Doloi valley circle were surveyed. From each sampling site three soil samples were drawn at a depth of 0-9", 9-18" and 18-36" and thus 141 soil samples were collected. All the soil samples were air dried and processed. The samples were analysed for mechanical separates, organic carbon, total nitogen, lime, magnesia, potash and phosphorus were determined by following the method described by Piper (1950). Available phosphorus was determined by the method of Trough (1930) modified by Lynch et al. (1949) and available potassium by Dyer’s citric acid method (1894). Nitrogen and organic matter on the non-sandy part of the soils were calculated on the basis of reactive part of the soils. During field survey, particulars of individual section namely topography, age of tea, spacing, vacancy, yield, shade, pests, diseases etc. were noted either in the field or from the garden’s records.

Source of Information: Pamphlet no. 3, 1975; Annual Report, 1974

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Tea vacancy increased with the increase in age of tea section and consequently the yield/ac decreases. Soil erosion is pronounced in sections which are kept under tea for longer period resulting in deterioration of organic matter and associated nitrogen contents of the soils. The loss of organic matter and nitrogen contents are the causes of poor growth, low yield and also failure of tea to produce expected results. The average C/N ratio in the surface soils ranges from 8.3 to 18.3 and in some cases appeared to be the limiting factor for satisfactory growth and yield. Lime content of most of the soils is much less than the optimum limit of the range required for good tea soils. 0.0036% of available phosphorus and 0.0098% of available potash in the surface soils may be regarded as the minimum standard for good tea soils of Manu-Doloi valley circle. For soils of low yielding sections the requirement will be less.

Knowledge Management: Report/Proceedings