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Estimation of Soil Nutrient (ca, Cu, Fe, & Zn) in the Polderised Area of Coastal Zone: a Case Study of Beel Dakatia, Khulna

M.R. Haque*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

J.U. Ahmad
Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh

S. Safiullah
Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh

K. Azam
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

Soil samples were collected from the three locations of Umvita, Ghona Madar Danga, and Taligati. Among the three locations, Umvita and Ghona Madar Danga were divided into two polders i.e., Polder-25 (Beel Dakatia ) and Polder-27. However, Taligati was in Polder- 25 (Beel Dakatia) only. Soils were analyzed for moisture content and soil nutrients (Ca, Cu, Fe, Zn). The moisture content in the soil of Polder-27 was relatively lower than that of the moisture content in the soils of Polder-25 (Beel Dakatia ), which indicated t he presence of high concentration of organic carbon and humic acid. The average concentration of essential macronutrient Ca and micronutient Fe and Zn were found to be lower in the soil of Polder-25 (Beel Dakatia) compared with the soil in Polder-27. However, the concentration of Cu was higher in Polder-27 in comparison with Polder-25 (Beel Dakatia). The lower value of soil nutrients in Beel Dakatia indicated loss of soil fertility.

Keywords: Soil nutrient; Coastal zone; Beel Dakatia; Moisture content

Location: Umvita, Ghona Madar Danga, and Taligati; Beel Dakatia, Khulna

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Nutrient status

Objectives:

The soil nutrients such as calcium, iron, copper, zinc etc are essential for the fertility of soils, which again are vital to agricultural productivity (Black, 1967). The present investigation was undertaken to assess soil fertility in Beel Dakatia with particular reference to the concentrations of Ca, Cu, Fe and Zn.

Methodology:

Soil samples were collected from three locations during December to February in order to avoid rainy season. The locations (Umvia and Ghona Madar Danga) were divided into two polders i.e. polder-25 (Beel Dakatia) and polder-27. These two polders were separated from each other by embankment. The location Taligati was in Polder-25. Samples 1-5 were collected from Umvita (Dumuria, Khulna); samples 6-10 were collected from Ghona Madar Danga (Dumuria, Khulna) and samples 11-15 were collected from Taligati (Fulbarigate, Khulna).

Pit was dug at the selected place and the soil sample was taken in a polythene bag. The bags were numbered properly and brought to the Chemistry Department, Jahangirnagar University for analysis.

Estimation of Moisture Content: Moisture percentage was determined by drying a known amount of collected sample in an oven (below 105⁰C) until the weight of the soil became constant. The loss of moisture from the soil was then determined.

Estimation of Calcium, Copper, Iron and Zinc: The collected soil samples were dried in sun light until constant weight and then powdered in a glass mortar through a 0.5 mm sieve. The powdered samples were stored in a reagent bottle. Then, a 0.5 g powdered sample was kept overnight in 10 ml of freshly prepared aquaregia and the mixture then evaporated to nearly dryness. 5 ml of concentrated and analar grade HNO3 was added and evaporated to nearly dryness. Then, again 5-6 ml deionized water was added and evaporated and the mixture was warmed up with 10 ml deionized water containing 2 drops of concentrated HNO3 and filtered quantitatively through Whatman 42 filter paper into a 10 ml volumetric flask and the volume was made upto the mark with deionized water (Latif, 1992). The concentration of calcium, copper, iron and zinc in the soil sample solutions was determined, using a Perkin Elmer Model 560 Atomic Absorption Spectrophotometer at Atomic Energy Center, Dhaka.

Source of Information: Khulna University Studies, 2(1): 107-114

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the present investigation, it is clearly observed that the soils of Beel Dakatia contained low concentration of calcium, iron and zinc in comparison with the soils in polder-27. The exact reasons for the low value of these metals are difficult to ascertain. However, it could be due to many factors such as total blockage of fresh sediment inputs, slowing down of the biogeochemical cycles of elements, particularly that of carbon and decrease or total stoppage of nutrient mobility of the micronutrients.

Knowledge Management: Journal