STATUS OF SEDIMNETATION AND THEIR PROPERTIES ON THE AGRICULTURAL LAND

Abstract

The sediments has a positive impact on soil physical and chemical qualities. The decreasing of sedimentation is causing decline in soil productivity and crop yield which results in severe degradation of environment. Any sediment management strategy performed in this system becomes an intrinsic part of this complex system, according to the goal of our research. This study was conducted at Dacope upazilla under Khulna district. This location was chosen since it is one of the most sediment-prone places. Primary and secondary data were gathered for the investigation. Soil samples were taken from three locations in Dacope upazilla: Dhaki, Vodra, and Chunkuri, using a random sampling approach at 2-3 cm depth. The sediment pH of Dacope upazilla is higher which expresses moderately alkaline (8.12, 8.13 and 8.09). Electrical Conductivity of all these sediments varies from 548.00

to 678.00 µs cm -1 expressing moderate to high salinity. The organic matter content is pretty low to medium (1.10 to 2.64 %) in Dhaki, Vodra and Chunkuri river. The highest OM (%) were found in the flow time of Vodra, khalside of Dhaki and ebb time of Chunkuri are 1.87, 2.64, 1.65, respectively and the variation was significant. The Organic carbon were (1.95, 1.69 and 1.97 %) in medium to low level. Nutrient deficiencies for total nitrogen were quite dominant in the study area (0.25, 0.34 and 0.20 %). Total Phosporus were (38.00, 36.80 and 34.30 ppm) and Sulfur contents were (36.54, 32.50 and 32.53 ppm) in medium level. The study's findings suggest that the severity of the sedimentation problem in the studied locations is worsening by the day. Depending on the pH, OM, OC, and other factors, it has an impact on crops and vegetation. The study offers implying essential management plan to implement correct policy based on the detection of sedimentation status in the studied region and a long-term decision-making approach in the Dacope upazilla of Khulna district.