Changing Land Use and Soil Fertility Over Time: Perspective Hatibandha Upazilla
Hasan, Md. Nazmul
Rahman, Md. Lutfar
MetadataShow full item record
Abstract : During the last 30 years the agricultural sector of the country has developed significantly, from traditional to intensive system, production is also much higher than the previous years; poverty level decreased remarkably and all other development indicators are in positive trend. However, there has been pressure on natural resources, particularly on soil health. Degradation of soil quality in terms of losing its base material content from top soils is a serious threat in this aspect. Considering the perspective, Hatibandha Upazilla of Lalmonirhat district was selected for the study aiming the objectives to quantify the changes in soil quality in terms of available nutrient content, changes in organic matter content and soil pH over time period. Soil Resource Development Institute conducted semi detail soil survey and collected and determined chemical parameters of 106 soil samples from Hatibandha Upazilla in 1998 to prepare “Land and Soil Resources Utilization Guide”. Those data base were considered as baseline for the present study. For conducting the present study 50 sampling locations in Hatibandha Upazilla had been selected based on physiography, agro-ecological zones, soil texture, land type and soil series from the same sampling location of semidetailed soil survey conducted in 1998. The study revealed that there was a decreasing trend observed in soil Ca, S, B and Mn contents while increasing trend of soil P, Fe, Cu and Zn content during the period 1998 to 2015. On the other hand some parameters like Mg, N and K content were almost unchanged over the time. Calcium content of top soil is decreasing in an alarming rate. Organic matter status remains almost unchanged in Hatibandha Upazilla. Soils of Hatibandha are becoming more acidic (pH 4.9 -5.7) since 1998 to 2015. In 1998 area under strongly acidic soils (pH 4.5-5.5) were 17,122 ha whereas in 2015 it increased to 19,142 ha, on the hand in 1998, area under slightly acidic (pH 5.6-6.5) soils was 3,328 ha whereas in 2015 it decreased to 1,308 ha.