http://localhost:8080/handle/123456789/4207 Wed, 08 Apr 2026 14:30:44 GMT 2026-04-08T14:30:44Z http://localhost:8080/handle/123456789/4809 ASSESSMENT OF HEAVY METALS IN SEDIMENT, WATER, AND FISH OF THE TURAG RIVER, DHAKA CITY, BANGLADESH NOMAN, ABDULLAH AL Metal pollutant has a harmful effect on biological systems and does not undergo biodegradation, therefore gets accumulated in the river bed, water, and into aquatic life. The present study intends to assess the level of contamination of sediments, water, and fish by heavy metals in the Turag River flowing through the Northern and Western sides of Dhaka City. To estimate the geochemical environment of the river, five trace elements, namely Cr, Cu, Cd, Pb, and Fe, were extracted from the freshly deposited river bed sediments, water, and fish of Turag River using a Di-acid mixer and analyzed at the Central Laboratory of the SAU using Atomic Absorption Spectrophotometer (Analytik Jena NovAA 400P). All the sediment and water samples were collected from eleven different locations and after preparation, samples were analyzed using standard procedure. Trace element contamination assessment reveals that the benthic sediment and water are contaminated at low to moderate levels in these areas, with a common trend of concentration of Fe>Cr>Cu>Pb>Cd for sediment, Fe>Cu>Cr>Pb>Cd for water, and fish. This indicates that the untreated and/or partially treated industrial and municipal wastewater discharges along the river bank might be the major sources of pollution. Results showed that metal concentration in sediment ranged between 0.11 to 3.81 mg/kg for Cd, 0.63 to 6.74 mg/kg for Pb, 43 to 201 mg/kg for Cr, 6.84 to 62.87 mg/kg for Cu, 1278 to 1831 mg/kg for Fe in the rainy season and 0.14-3.72 mg/kg for Cd, 0.34-12.85 mg/kg for Pb, 48-239 mg/kg for Cr, 22.7-49.62 mg/kg for Cu, and 1777-1885 mg/kg for Fe in the winter season. In water samples, the results also showed that metal concentrations ranged from 0.16-0.5 mg/kg for Cd, below the detection limit for Pb and Cu, 0.21-0.3 mg/kg for Cr, and 0.44-2.31 mg/kg for Fe respectively in the winter season and the metal concentrations also ranged from 0.4-3.61 for Fe, below the detection limit for Pb, Cr, Cu, and 0.04 mg/kg for Cd in one station among eleven in rai ny season which is ignorable. In the case of fish, five species have only been found during the rainy season. There is no fish was found in the winter season due to higher pollution. The average results from these species are 0.55 mg/kg for Cd, 0.28 mg/kg for Pb, 0.65 mg/kg for Cr, 3.14 mg/kg, and 894.56 mg/kg for Fe. The highest contamination degree of the sediment was noticed at Location 1 (Amin Bazar Bridge, Gabtoli) and the lowest at Location 6 (near Dhaka Ashulia Highway), and the highest degree of water contamination was noticed at location 1, and the lowest contamination degree of water is noticed at location 6 in both rainy winter season. The contamination level varies systematically with the distance from the contamination source. However, it is anticipated that the sediment, water, and aquatic ecosystem may degrade in the near future due to increasing anthropogenic inputs in the river basin, hence proper management strategies are required to control the direct dumping of wastewater in the river. A Thesis Submitted to The Department of Agricultural Chemistry, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN AGRICULTURAL CHEMISTRY Fri, 01 Jan 2021 00:00:00 GMT http://localhost:8080/handle/123456789/4809 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4808 EFFECTS OF Mg, S, Zn, Mn AND B ON GROWTH, YIELD AND OIL CONTENT OF SUNFLOWER MD. SHAMIMUZZAMAN A field experiment was conducted at the research farm and Agro-Environmental Lab, Department of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh, during the period from November 2021 to March 2022. The experiment comprised of eight treatments viz., T 1 =Urea @ 210 g/plot +TSP@ 84g/plot + MoP@ 98g/plot+Spraying 0.2% Borax @ 2g/L of water, T 2 = BARI recommended fertilizers + Borax 7.0 g/plot + ZnSO 4 ii 8.4 g/plot in soil, T 3 = BARI recommended fertilizers + Spraying 0.5% Borax + 0.5% ZnSO 4 5g/L of water , T 4 = BARI recommended fertilizers + MgSO 4 10 g/ Plot + Spraying MnO 2 @ 2g/L of water , T 5 = BARI recommended fertilizers + Spraying Bamper Vitamix @ 2g/L of water, T 6 =BARI recommended fertilizers+Spraying 0.2% Borax @ 2g/L of water+0.2% ZnSO 4 @ 2gm/L of water, T 7 = BARI recommended fertilizers + Spraying 0.2% ZnSO 4 @ 2g/L of water and T 8 = control (e.g.: no N, P, K, S, Mg, Zn, Mn and B). Data on different growth and yield parameter were recorded and statistically significant variation was found for different treatments of secondary and micronutrients. The results of this experiment showed that, the maximum plant height (180.67 cm), number of seed per head (645.5), number of leaves per plant (23.33), leaf area (65.33 cm), length of leaf (23.88 cm), leaf width (19.88 cm), weight of total seed per plot (2.51 kg), weight of seed per head (64.55 gm), weight of single seed (0.1 g), yield (1.7 t/ha), oil content (46.53 %) and protein content (22.25 %) was obtained wth T 5 treatment. While the minimum number of leaves (12.00), number of seed per head (375.9), plant height (146.73 cm), number of total head per plot (37), weight of total seed per plot (1.18 kg), yield (0.85 ton per ha), oil content (21.28 %), weight of seed per head (26.31 gm), weight of single seed (0.07 g) and protein content (13.97 %) were recorded from the control treatment. So, it can be concluded that a combination of BARI-recommended fertilizers + spraying Bamper Vitamix @ 2gm/ L of water is suitable for sunflower cultivation. A Thesis Submitted to The Department of Agricultural Chemistry, Faculty of Agriculture Sher-e-Bangla Agricultural University, Dhaka In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN AGRICULTURAL CHEMISTRY Fri, 01 Jan 2021 00:00:00 GMT http://localhost:8080/handle/123456789/4808 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4807 ASSESSMENT OF HEAVY METAL CONTAMINATION IN VEGETABLES FIELD OF BOGURA DISTRICT: OVERVIEW OF POLLUTION INDICES AND RISK ASSESSMENT SAMMA, SADIA The current study focused on quantifying hazardous heavy metals (Pb. Cu, and Cr) in soil-vegetables (potato, tomato, pepper, cauliflower, and cabbage) systems in different Upazilla of Bogura district in Bangladesh to assess their effect on human health and the environment. The instrumental detection method was validated according to linearity, determination co-efficient, limit of detection (LOD), limit of quantification (LOQ), accuracy, and precision. All the vegetables and their field soil had Cu concentrations lower than the maximum permissible limit set by BFSA, FAO/WHO. The concentration of Cr and Pb in vegetables exceeded the maximum allowable limit, but their field soil in different Upazilla of Bogura District did not exceed the maximum allowable limit as per FAO/WHO. For contamination factor (CF), only Pb severely contaminated the vegetables (CF>6). The contamination degree (CD) data also showed that all vegetables had severe contamination. The pollution load index (PLI) results indicated vegetable field soil of Kahaloo, and Bogura Sadar had the highest PLI, while the vegetables produced in Nandigram and Dupchanchia had the lowest PLI. The bioaccumulation factor (BF) values were found ˂1 in all vegetables for Cu, Cr, and Pb indicating trace metal transfer from field soil to consumable parts. Furthermore, the potential ecological risk factor (ERi) by single metal and risk index (PERI) results revealed lower ecological risks in vegetable fields. Health risk assessment showed that all vegetable samples were unsafe for human consumption as the carcinogenic health risk (CHR˃10 ) and noncarcinogenic health risk (HI ˃1) quotients seem more than the safe level in all vegetable samples. Findings show that heavy metal concentrations were high in vegetable fields endangering the environment and consumer health. Actions should be taken to reduce heavy metal pollution in the vegetable fields of different Upazilla of Bogura district to protect the environment and the consumer's health. A Thesis Submitted to the Department of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Dhaka-1207, In partial fulfillment of the requirement for the degree of MASTER OF SCIENCE IN AGRICULTURAL CHEMISTRY Fri, 01 Jan 2021 00:00:00 GMT http://localhost:8080/handle/123456789/4807 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4806 EFFECT OF ARSENIC ON GROWTH, YIELD AND NUTRIENTS CONTENT OF FIVE BORO RICE VARIETIES CHOWDHURY, MD. ASIKUR RAHMAN A pot experiment was conducted at the net house of Agro-environmental chemistry laboratory of department of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from December 2020 to March 2021 to study the effect of arsenic on the growth, yield and nutrients content in straw and grain of rice varieties. Five rice varieties viz. V 1 (BRRI dhan-29), V 4 (BRRI dhan-55) and V 5 ii (BR-16), V 2 (BRRI dhan-28), V 3 (BRRI hybrid dhan-5) were comprised with five arsenic treatment viz. As 0 (control; no arsenic added), As 1 soil), As 2 (10 mg As kg -1 soil), As 3 (20 mg As kg -1 soil) and As 4 (2 mg As kg (40 mg As kg soil) for the present study. The experiment was laid out in Completely Randomized Design (CRD) with four replications. Among different rice varieties, V 5 showed better performance on growth and yield contributing parameters except plant height, leaf length and number of leaves hill -1 . Maximum grain and straw yield (19.5 g hill and 24.70 g hill -1 , respectively) were obtained from V 5 variety whereas minimum grain yield (12.76 g hill -1 ) from V 2 and straw yield (13.79 g hill -1 ) from V 4 was obtained. Arsenic had significant effect on growth and yield contributing parameters of rice and it was observed that higher doses of As showed lower performance on yield and higher As content in grain and straw. In terms of treatment combinations, V 5 showed highest number of panicles hill -1 (10.25), filled grain panicle -1 (143.40), 1000 grain weight (28.63 g), grain yield hill -1 (28.60 g) and straw yield hill (41.00 g) whereas V 3 As 4 showed minimum results. In case of nutrient content, V 5 gave maximum K (0.259%) content in grain but V 5 As 4 showed maximum S content (0.197%) whereas in straw, the maximum P (0.215%), K (1.057%) and S content (0.330%) were recorded from V 1 As 0 , V 2 As 0 and V 5 As 4 , respectively. Increased doses of As adversely affected the growth and yield of rice variety. But V 1 (BR-16) up took minimum As than other varieties and As content increased with increasing doses of it. In terms of treatment combinations, V 3 As 4 gave maximum As content in straw (230 mg/kg) and this treatment combination showed no grain yield that is why the maximum As content in grain (270.00 mg/kg) was found from V 3 As 3 . In case of As uptake, V 2 , V 3 , V 4 and V 5 was increased with the increasing amount of As addition in soil but in case of variety V 1 was not that much increased like other varieties in grain and straw. So, it was found that low or no As was recommended for successful rice cultivation. A Thesis Submitted to the Department of Agricultural Chemistry Sher-e-Bangla Agricultural University, Dhaka In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN AGRICULTURAL CHEMISTRY Fri, 01 Jan 2021 00:00:00 GMT http://localhost:8080/handle/123456789/4806 2021-01-01T00:00:00Z