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Evaluation of the Suitability of the Methods for Assessment of Nutrients of Datmara Soils with Respect of Rubber Plant

K. Anam
Department of Soil Science, Universit of Dhaka; Dhaka, Bangladesh

Dr. Didar-ul-Alam
Professor
Department of Soil Science, Universit of Dhaka; Dhaka, Bangladesh

Dr. Shafiqur Rahman
Professor
Department of Soil Science, Universit of Dhaka; Dhaka, Bangladesh

Dr. S.M. Imamul Huq
Professor
Department of Soil Science, Universit of Dhaka; Dhaka, Bangladesh

Abstract/ Executive Summary:

Out of different extraction methods used in the study to evaluate the availability of nutrient of Datmara soil with respect to rubber plants, Morgan's reagent, 0-SM. NaHC0₃ and acidified l N.Na CI (pH-1.0) were found to be suitable for phosphorus, potassium and calcium respectively.

Keywords: Soil, Nitrogen, Nutrient status, Soil nutrient, Calcium, Magnesium, Calcium, Magnesium, Phosphorus

Location: Datmara, Chittagong.

Start Date: 00-00-1972

End Date: 00-00-1978

Program Area: Crop-Soil-Water Management

Non-commodity: Performance

Objectives:

To investigation different extraction methods were used as tool for the determination of the nutrient supplying power of a rubber garden soil with respect to rubber plant.

Methodology:

Four rubber gardens in the district of Chittagong were selected for the study. The entire study area belongs to Datmara series. The gardens were planted in the years of 1972, 1973, 1978 and 1979 respectively. Four composite soil samples from C-15 cm surface soil and rubber leaves from respective areas were collected from two different topographic positions (top and basin) of 1972 and 1973 gardens. Two composite soil samples were collected from 1978 and 1979 gardens. After air-drying and processing some of the physical and chemical properties were determined. pH was measured by a glass electrode pH meter at a soil: water ratio of 1 : 2.5. Particle size distribution was determined by hydrometer method and texture was determined following U.S.D.A. (1951) method. Organic carbon was determined by wet oxidation method. Total and available nitrogen were determined by Kjeldahl's method. Phosphorus was determined through vanadomolybdophosphoric yellow colour method in nitric acid system and making use of Colcman Junior spectrophotometer. Potassium was determined by flame photometer and calcium and magnesium were determined by E. D. T. A. method. Collected rubber leaves were washed with distilled water and then dried to constant weight in an oven at 75°C for few hours. Ten the samples were ground to fine powder with the help of a micro grinder. Wet washing of plant samples were made according to the procedure described. lN.NaCl, acidified (pH-1.0) IN.NaC1, Morgan's reagent, water extraction, 2N.KC1 and 0.5M.NaHC0₃.

Source of Information: Dhaka University Studies, B, XXX, (2): 181-189, 1982 (July).

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The correlation coefficient between calcium contents of rubber leaves and the available calcium in soils as extracted by acidified 1 N. NaC1 (pH-1.0) method was found to be significantly correlated at 1.0% level (r = +. 0.9431). The remaining methods did not show any significant correlation. The higher amounts of available potassium in these soils may be due to the immature nature of the soils containing easily weatherable minerals. The coefficient of correlation was found to be significant at 2.0% level (r= +0.8848). Other methods failed to show any significant correlation with the uptake. Total carbon and nitrogen contents of the 1973 garden were slightly higher than the other gardens. The basin soils of 1972 garden and top soils of 1973 garden contained comparatively larger amounts of available nitrogen. However no significant correlation was found between the nitrogen contents of rubber leaves and available soil nitrogen extracted by different methods. The amount of magnesium extracted varied widely within the soils and within the · methods of extraction. 2N. KCl extracted maximum amounts of magnesium while water extraction gave minimum a mounts of magnesium in case of all soils. 138 and 128 ppm of magnesium were extracted by 2N. KCl 'method from top and basin soils of 1972 garden which were the highest values among all the soils'. Higher amount of Magnesium in soils of this garden may be attributed due to less acidic nature ·of these. soils. All the extraction methods used in this study reflected their poor capability to show significant correlation between the available magnesium contents of the soils as extracted by different methods and the uptake by rubber plants. So, further research work is necessary to find out a suitable extraction method for the assessment of available magnesium in soils of Datmara series.

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