CARBON SEQUESTRATION IN SOIL AGGREGATES UNDER DIFFERENT CROPPING PATTERNS IN GANGES RIVER FLOODPLAIN, BANGLADESH

Abstract

The Five different cropping patterns such as Fallow-Fallow-Fallow (F-F-F), Sugarcane-Sugarcane-T Aman (S-S-R), Vegetables-Fallow-T Aman (V-F-R), Fallow-Fallow-T Aman (F-F-R) and Fallow-Mung bean- T Aman (F-M-R) from Jessore district were investigated for carbon sequestration in soil aggreagates. Highest value of bulk density (1.53 g cm-3) was found in S-S-R and lowest (1.27 g cm-3) in F-M-R. The soil under V-F-R exhibited highest porosity (47.76%). F-M-R exhibited highest saturated hydraulic conductivity (15.36 cm day‑1). The state of aggregation and degree of aggregation was found high under F-F-R. The dispersion factor was highest under F-F-F (13.32%) and lowest under F-F-R (7.04%). The soil organic carbon (SOC) associated with >0.05 mm aggregates was generally higher than that with 0.05-0.002 mm and <0.002 mm aggregates. The clay associated (<0.002 mm) SOC was higher than SOC in 0.05-0.002 mm aggregates. The highest SOC in >0.05 mm aggregate and <0.002 mm particles were found under F-M-R and S-S-R patterns, respectively.