Structural attributes of soils under rice-based cropping pattern in the Ganges-Kobadak project area of Bangladesh
1992
Rahman, M.H. | Khan, T.H. | Hoque, S.
Soils of the investigated areas were dominated by silt fraction and the coarse sand fraction was almost absent in the soils. Irrigation and accompanying management practices did not have any influence on particle-size distribution. Indexes of aggregation (both state and degree) did not show any definite trend in their variation with the depth of the horizons in a given profile, but showed a good relationship with topographic position of the profiles in the catena in all the three locations. The values of soil bulk density were lower in the Ap1 horizons compared to the values in the Ap2 horizons and consequently total porosity showed opposite trend. These results indicated the formation of compact plow sole at the shallow depths of the soils. Plow soles were more prominent in the irrigated areas. Most of the horizons of the different soil profiles were medium compact to compact. Total porosity of the Ap2 horizons in most of the soil profiles are unsatisfactory for dryland crops. Ap1 and Ap2 horizons of all the soil profiles lack in air porosity which may create constraints in the cultivation of upland crops. In Sara series hydraulic conductivity in most of the horizons could be characterised as moderately slow to moderate, while in Gopalpur and Ishurdi series it was slow to moderately slow. Correlation studies showed that structural attributes showed significant correlations with organic matter clay, silt and sand contents of the soils.
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