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A Comparison of Extraction Methods to Assess the Available Ca and Mg in Some Bangladesh Soils

K. Anam
Department of Soil Science, University of Dacca, Bangladesh.

S. M. Imamul huq
Department of Soil Science, University of Dacca, Bangladesh.

M. Ahmed
Department of Soil Science, University of Dacca, Bangladesh.

N. U. Ahmed
Department of Soil Science, University of Dacca, Bangladesh.

Abstract/ Executive Summary:

Extractants used in tile study indicated that NaCl was best suited to the determination of available Ca and Mg of some representative soils of Bangladesh. NaOAc ranked next to NaCl for Ca and Morgan's extractant for Mg. There existed a high correlation between these extraction methods and the uptake of Ca and Mg by the paddy plants at the vegetative as well as at the flowering stages of their growth. Rest of the methods failed to give any meaningful indication.

Keywords: Soil, Calcium, Magnesium, Nutrient status

Location: Sirajganj, Taiganil, Hazigoaj, Joydebpur, Santal

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To develop methods to assess the available nutrient status in soils with respect to different crops and a suitable method of extraction for Ca and Mg

Methodology:

Five represent Bangladesh soils were included in the study. The surface (0-15 cm) soils were collected which varied in their physical and chemical properties. Mechanical analyses were done byn hydrometer method as outlined by Piper (10), and the texture was deter mined by the USDA (H) method; pH of the soils were determined by a Pye glass electrode pH meter at a soil: water ratio of 1 : 2.5; organic carbon by wet oxidation method (12) and Ca and Mg by EDTA titration. Green house experiment: Seven pounds of each soils were taken in earthen ware pots arranged in a completely randomized design in triplicates. Twenty healthy seeds of 'Chandioa' variety of paddy were sown in each of the pots. The seedlings were thinned to 12 after 10 days. The soils in the pots were kept moist in the early stage of plant growth; during rest of the period 2-3 inches of water was maintained stagnated in the pots. Half of the plants were harvested (with roots) after 50 days and the rest after 90 days of their growth. The different extractants used to evaluate the Ca and Mg availability status of the soils with respect of Chandina paddy. In all the cases the soil: extractant ratio was maintained at 1 : 10.

Source of Information: Bangladesh Journal of Soil Science. 9: 25-29, 1973

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The amount of Ca and Mg extracted by different extractants and their percentage in the paddy plants at the vegetative (60 days old) and flowering stage (90 days old) are presented respectively. This related to the extracting capacity of the cxtractants as well as to the soil characteristics. The amount of Ca and Mg contents of all the plants at the vegetative stage is higher than that in the flowering stage. This variation in plants are presumably related to the fertility status of the soils. Ca extracted by the NaCI and NaOAc were well correlated with the uptake at both the flowering and vegetative stages of the growth in plants. A very high correlation existed between the uptake of Mg by paddy plants at the vegetative stage and that extracted by NaCI in all the soils. Other extractants, viz., NaOAc and Morgan's gave significant but poor correlation in comparison to NaCl. The remaining extractants failed to give any acceptable result. The NaCI and M organ's extractants were found to be significantly but not very strongly correlated at the flowering stage. All other method s of extraction were found to be insignificantly correlated at this stage of growth was observed that the Ca and Mg extracted by NaCI and Morgan's extractants were significantly correlated with the uptake at both the stages of plant growth, although the slope of the line of regression indicated that the soils gave statistically different values with reference to Mg extracted by various extractants and that of the plants uptake. Peech (9) also reported that neutral NNaCl is better than neutral N NH4 0Ac for the extraction of available Mg in soils.

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