Masud Hassan*
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh.
Abdullah Abu Syeed Ahmed
Deprtment of Agriculture and Forestry, University of Helsinki, Helsinki, Finland.
Md Arafat Hassan
Department of Geography and Environment, University of Dhaka, Dhaka 1000, Bangladesh.
Rubaya Nasrin
Department of Environmental Sciences, Jahangirnagar University, Bangladesh
A. B. M. Sadique Rayhan
Department of Marine Affairs, Xiamen University, Fujian, China
Sk. Musfiq-Us- Salehin
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh.
Md Khaliur Rahman
Department of Soil, Water and Environment, University of Dhaka, Dhaka 1000, Bangladesh.
Soil fertility; Tista floodplain; Nutrients status; Change analysis; Organic matter
Crop-Soil-Water Management
Soil fertility
The baseline soil chemical properties were taken from the Phulbari Upazilla land and soil resources utilization guide which was published in the year 1996 average value of similar soil series that were collected from Upazilla land and soil resources utilization guide published in 1996. The initial soil reaction, soil organic matter, total N, P, K, S, Fe, Ni, Cu and Zn content were 5.87 ± 0.47, 1.37 ± 0.31%, (0.49 ± 0.13, 0.10 ± 0.04, 0.31 ± 0.29, 0.19 ± 0.05, 1.09 ± 0.46, 0.10 ± 0.02, 0.03± 0.01, 0.01 ± 4.8E-20) cmol/kg found in 1996 among studied soil series.. The studied soil series were Peergasa, Palashbari, Kauniya, Jamun, Gangachara (MHL), Tista Silty Soil, Loskora, Gangachara (HL), Tista Sandy soil and, Chilmari. 30 soil samples were collected from in year 2016 from Phulabari upazilla under Kurigram district with GPS co-ordinations and chemical analysis were done in soil laboratory. Composite soil samples were collected from the surface soil (0-15 cm) in June 2016. 30 soil samples were collected from ten different soil series with 3 replication. These samples were then placed separately on trays and dried in shed condition. After drying, samples were prepared for analysis by grinding and sieving using 2 mm size sieve. Then, these samples were kept in polyethylene bags with proper labeling. After that, these samples were analyzed in the laboratory. Then, these samples were kept in polyethylene bags with proper labeling. The particle size analysis of soil was carried out by hydrometer method . and that of textural classes by Marshall Triangular coordinates. Soil pH was measured electronically using a corning glass electrode pH meter at a soil to water ratio of 1: 2.5. The organic carbon of soils was determined volumetrically by wet oxidation method.Soil organic matter was calculated by multiplying the percent value of organic carbon by the conversion factor of 1.724. Total nitrogen content in soil was determined by the Micro Kjeldahl’s method following concentrated sulfuric acid (H2SO4) digestion and alkali distillation. Total P, K, and S were determined by digestion with a mixture (1:3) of concentrated HCl/HNO3. Total P was determined by yellow color method. S was determined after developing turbidity. and total K was measured by a flame photometer. Total concentration of Fe, Mn, Cu and Zn in soil was analyzed by digesting the soil with aqua rezia (1:10). Total Fe, Mn, Cu and Zn were analyzed by AAS (Atomic Absorption Spectrophotometer). The methodology for determining all these chemical properties were similar in 1996 and 2016. Past and present study were carried out within June 1996 and June 2016 respectively to identify the changes of soil reaction, soil organic matter, total N, P, K, S, Fe, Ni, Cu and Zn were compared over 20 years (1996-2016) of Studied soil samples.t-test and standard deviation was done by Stata software to analyze studied data To interpret the soil test values, the critical levels of each elements were used as given in the fertilizer recommendation guide.
ARJA, 5(3): 1-9, 2017; Article no.ARJA.34365
Journal