Environmental Engineering Reference
In-Depth Information
Soil organic matter showed a positive correlation with water salinity, water transparency,
soil salinity, soil organic carbon, water table depth, percentage of clay, moisture, field water
capacity of soil and negatively correlated with water temperature, dissolved oxygen, total
suspended solids, tidal height, inundation period, soil temperature, percentage of sand, bulk
density, particle density, exchangeable Ca & Mg, total N and available P at the level of
p<0.01 (Appendix B).
Significant difference in the range of percentage of sand of the collected soil of the study
area was noticed during sampling in different seasons of the year (Table 1, Figure 16). Sand
content of soil was ranged from 6.73±0.40 to 17.47±0.96% with a minimum value (6.13%)
found in winter and a maximum value (19.05%) recorded in monsoon during sampling
session (Appendix A). Variations in the ranges of the percentage of sand among monsoon,
postmonsoon, winter and premonsoon were significant at p<0.05 (Table 1). Significantly
(p<0.05) higher value in monsoon and lower value in winter was noticed in this study.
Amount of sand (%) found in the soil of the study area showed a significant (p<0.01) positive
correlation with water temperature, water transparency, dissolved oxygen, total suspended
solids, tidal height, inundation period, soil temperature, bulk density, particle density & the
exchangeable Ca& Mg of soil and a negative correlation with water salinity, water
transparency, water table depth, soil salinity, soil organic carbon, organic matter, percentage
of clay, moisture, field water capacity of soil (Appendix B). Sand (%) portion of soil also
showed a positive correlation with total N & available Pand a negative correlation with
silt(%) of the collected soil sample at a level of p<0.05.
Amount of silt measured from the soil sample of the study area was fluctuated between
seasons that were ranged from 50.05±0.69 to 51.24±0.64%. The lowest percentage (49.13%)
of silt was recorded during premonsoon while the highest percentage (52.01%) was measured
during winter (Appendix A, Figure 16). Throughout the seasons silt content was found to be
higher, sand content was lower and the clay content was found to be an intermediate level in
the present study. There was no significant difference in the measured value of the percentage
of silt of soil collected from the fieled in different seasons during the period of sampling
(Table 9). Percentage of silt of the collected soil showed a significant (p<0.01) negative
correlation with water and soil temperature in the present study. Silt content also negatively
correlated with total suspended solids, percentage of sand, particle density of soil at a level of
p<0.05 (Appendix B).
A notable fluctuation in the percentage of clay of collected soil sample was noticed in the
present study (Table 1, Figure 16). Clay content of soil was ranged from 32.17±1.88 to
42.04±0.68% with a minimum value (28.36%) found in monsoon and a maximum value
(42.89%) recorded in winter throughout the sampling session (Appendix A). Variations in the
ranges of the percentage of clay among monsoon, postmonsoon, winter and premonsoon were
significant at p<0.05 (Table 1). Significantly (p<0.05) higher value in winter and lower value
in monsoon was found in this study. Amount of clay (%) found in the soil of the study area
showed a significant (p<0.01) positive correlation with water salinity, water transparency,
water table depth, soil salinity, soil organic carbon, organic matter, moisture, field water
capacity and a negative correlation with water temperature, dissolved oxygen, total suspended
solids, tidal height, inundation period, soil temperature, percentage of sand, bulk density,
particle density, exchangeable Ca and Mg of soil. Amount of clay (%) also showed a negative
correlation with total N and available P of the collected soil sample at a level of p<0.05
(Appendix B).
