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Available Status and Changing Trend of Micronutrients in Floodplain Soils of Bangladesh

M.M.H. Sarker
Department of Soil Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

A.Z.M. Moslehuddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. Jahiruddin
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Soil micronutrient deficiency has arisen in Bangladesh as a consequence of soil fertility depletion with time. Increasing cropping intensity and cultivation of modern varieties with high yield potential are the major reasons of nutrient depletion from soil, which results in decline of crop yield. With an objective of studying delineation of soil micronutrient status, their depleting trend over time, relationship with other soil variables and interrelationship among micronutrients, a study was carried out in Old Meghna Estuarine Floodplain (AEZ 19) soils of the country. In the present study, soil analysis of top soils (0-15 cm soil depth) shows that availability of Zn and B declined after a decade of time. However for other micronutrients, viz. Cu, Mn and Fe, still prevailing high status. Micronutrient levels of subsoil (15-30 cm soil depth) were in general lower than those of top soils. The soil Zn had significant positive correlation with clay content (r=0.712**) and its availability was found influenced more by clay fraction in case of higher Zn concentration (>1.35 µg g^-1) than lower concentration (<1.35 µg g^-1). The Cu content in soil was positively influenced by soil clay content (r=0.267*), organic matter content (r=0.279*), N content (r=0.579**) and Mg content (r=0.364**), and was negatively influenced by soil pH (r= -0.347**) and P content (r= -0.340*). Concerning interrelationship among soil micronutrients, Cu content showed positive interaction with Zn content (r=0.244) and negative interaction with B content (r= -0.255). In sub soil, except soil B content, all other micronutrient contents were negatively correlated with soil pH. Only Cu content was significantly correlated (r=0.362**) with clay content. There exists positive relationship between soil organic matter and Zn (r=0.269*), Cu (r=0.357**) and Fe content (r=0.362**). The Zn, Cu and Fe content in soil was positively correlated with soil N content, r values being 0.455**, 0.526** and 0.659**, respectively.

Keywords: Micronutrients, Status, Nutrient depletion, Trend, Floodplain soil, Bangladesh.

Location: Soil Resource Development Institute in respective Upazila Nirdeshikas (Adorsho Sadar and Burichong of Comilla district).

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Crop-Soil-Water Management

Commodity: Micronutrient

Objectives:

This study was conducted in the intensively cropped area covering AEZ 19 to search out the present status of micronutrients, their depleting trend over time, relationship of micronutrients with other soil variables and interrelationship among micronutrients.

Methodology:

The bench mark information of fertility status in soils of the study area has generated and published by the Soil Resource Development Institute in respective Upazila Nirdeshikas (Adorsho Sadar and Burichong of Comilla district). For delineating the present fertility status, soil sampling was done from the representative sites of the study area in 2011-2012. The sampling sites were selected based on the land type and soil series. The corresponding previous sampling spots cited in respective Upazila Nirdeshika were also in consideration. Highest efforts were given for selecting closer spots to the previous sampling spots maintaining the other above mentioned criteria. GPS (Geological Positioning System) reading was recorded for each site. Fifty five sampling sites were selected, and from each site two samples were collected at two soil depths (0-15 cm and 15-30 cm). Maps showing the locations of selected soil sampling sites have included in figures 1 & 2. The collected soil samples were spread on a brown paper in the laboratory for air drying. After removing the plant roots and other debris, the air-dried soil was ground and passed through a 2-mm sieve for lab analysis. The processed samples were kept in polyethylene bags. Subsequently, the soil samples have been analyzed for basic soil properties (pH, organic matter and texture), macronutrients and micronutrients (Cu, Fe, Mn, Zn and B) status.Soil pH was measured by glass electrode pH meter (McLean, 1982), texture by hydrometer method, organic carbon by wet oxidation method , total N by micro-Kjeldahl method, available P for neutral and alkaline soil by Olsen method, available P for acidic soil by Bray and Kurtz method, exchangeable K, Ca & Mg by 1N CH₃COONH₄ extraction, available S by 0.15% CaCl₂ extraction, available Zn, Fe, Mn & Cu by DTPA extraction and available B by hot water-0.02M CaCl₂solution (1:2) extraction followed by determination using azomethine-H method (Keren, 1982). Based on the analytical results of each micronutrient, soil samples were categorized into very low, low, medium, high and very high status (FRG, 2012). Relationship of each micronutrient with basic soil characteristics (clay content, pH and organic matter content) and macronutrients, and also interrelationship among different micronutrients were examined by correlation statistics. A comparison was also made between present soil test value and previous soil test values obtained from Upazila Nirdeshika. The analytical results derived from collected soil samples and Upazila Nirdeshika is denoted in this manuscript as present and previous status, respectively. The soil samples for preparing the respective Upazila Nirdeshikas were collected by SRDI in 1997-2002. Standard statistical tools were used in comparing the data.

Source of Information: SAARC J. Agri., 16(1): 35-48 (2018)

Article Link (Online Journal): DOI: http://dx.doi.org/10.3329/sja.v16i1.37421

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Like macronutrients soil micronutrient deficiency has also arisen in floodplain soils of Bangladesh with advancement of time. The relationships between soil micronutrients and other soil parameters as well as soil macronutrients which were explored through this study may help in soil management practices in the study areas.

Knowledge Management: Journal