http://localhost:8080/handle/123456789/2788 Wed, 08 Apr 2026 16:15:56 GMT 2026-04-08T16:15:56Z http://localhost:8080/handle/123456789/5155 EFFECTS OF ORGANIC AND INORGANIC FERTILIZERS ON GROWTH, YIELD AND NUTRIENTS CONTENT OF CAPSICUM (Capsicum annuum L.) REGISTRATION NO. 15-06843 An experiment was carried out at Sher-e-Bangla Agricultural University (SAU), Sher-eBangla Nagar, Dhaka-1207 to study the effects of organic and inorganic fertilizers on growth, yield, and nutrients content of capsicum (Capsicum annuum L.) during the period from November 2021 to March 2022. The experiment considered 8 treatments viz. T 0 (control), T 1 (Recommended doses; RD of inorganic fertilizer), T 2 (Vermicompost - 3.5 t ha -1 ), T 3 (Poultry manure - 8 t ha -1 ), T 4 (50% vermicompost + 50% inorganic fertilizer of RD), T 5 (25% vermicompost + 75% inorganic fertilizer of RD), T 6 (50% poultry manure + 50% inorganic fertilizer of RD) and T 7 (25% poultry manure + 75% inorganic fertilizer of RD). The treatment T 5 (25% vermicompost + 75% inorganic fertilizer of RD) exhibited the highest plant height (51.93 cm) but the treatment T 4 (50% vermicompost + 50% inorganic fertilizer of RD) showed the highest number of leaves plant (9.47), flowers plant -1 (11.53), fruits plant -1 -1 (52.07 cm), branches plant (8.71), fruit length (89.93 mm), fruit diameter ( 67.27 mm), individual fruit weight (94.85 g), number of fruits plot -1 (40.67), yield plot (3859.00 g) and yield (19.30 t ha -1 ) whereas control treatment showed least performance. Regarding the nutrient content of capsicum, N content differed significantly and the treatment T 7 (25% poultry manure + 75% inorganic fertilizer of RD) showed the maximum N content (1.73%) whereas T 0 (control) treatment showed the lowest result (0.57%). P and K contents of fruit showed non-significant variation among the treatments. So, it can be concluded that the treatment T 4 (50% vermicompost + 50% inorganic fertilizer of RD) treatment was very much promising for higher capsicum production (ASTHA F1) followed by T 5 (25% vermicompost + 75% inorganic fertilizer of RD). Treatment of 50% vermicompost + 50% inorganic fertilizer of RD (T 4 ) can be recommended at farmers level to achieve higher capsicum production. 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 2 MASTER OF SCIENCE (MS) IN AGRICULTURAL CHEMISTRY Sat, 01 Jan 2022 00:00:00 GMT http://localhost:8080/handle/123456789/5155 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5103 PURITY ANALYSIS OF IMIDACLOPRID INSECTICIDE COLLECTED FROM JESSORE DISTRICT BY ULTRA HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY (UHPLC) WITH PHOTO DIODE ARRAY DETECTOR FIROZ AHMED, KHONDOKAR MOHAMMED The present study introduces a UHPLC method that is simple, specific, and accurate in measuring the active component imidacloprid in the 20SL formulation. The analytical separation was conducted using a Waters Cortecs C18 column using an ultraviolet photodiode array (UV-PDA) detector at a wavelength of 272 nm. The method's validation results showed that the suggested method has good specificity with satisfactory linearity (R 2 ≥ 0.9994), short retention time, and peak area precision. The method's accuracy and precision revealed a significant recovery (98.9 - 101.2%) at the three-spiked level with excellent precision (less than 1.89% RSD). The chromatographic separation took around 5 minutes to complete under the established chromatographic conditions. The developed and validated method was used to determine the purity of mostly used and available of seven (7) selected imidacloprid marketed brands insecticide from twenty one (21) samples. The samples were collected from sadar upazilla of Jessore district during September 2021 and then the samples were carried to the food safety laboratory of the Sher-e-Bangla Agricultural University, Dhaka on the same sampling day. Among 7 different brands of imidacloprid insecticide samples, 5 (71.43%) were found 110-130% pure which means over standard of active ingredient (AI). Whereas one of the total tested brand was 80-90% pure, and the remaining one brand was below 10% pure. This means that farmers are using imidacloprid having either higher or less of AI than required. This study reflects the small scale scenario of the presence of AI in different marketed brands of imidacloprid insecticide, which will help the policy maker to be aware of quality control importance of the plant protection products. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AGRICULTURAL CHEMISTRY Sat, 01 Jan 2022 00:00:00 GMT http://localhost:8080/handle/123456789/5103 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5102 EFFECT OF LIMING AND GA ON GROWTH, YIELD AND SOME NUTRIENTS CONTENT OF STEVIA 1 3 (Stevia rebaudiana Bert.) AKTER, MST. RUBA A field experiment was conducted at the experimental farm of Regional Sugercrop Research Station Thakurgaon of Bangladesh Sugarcane Research Institute (BSRI), during March 2021 to September 2021 to study the effect of lime and GA on growth, yield and nutrient content of stevia. The trail was laid out in Randomized Complete Block Design (RCBD) with three replications. Factor A (lime), was used on treatment L 3 1 : Control, L 2 : 0.5 t ha , L 4 : 1.5 t ha -1 and L 5 : 2.0 t ha -1 . Factor B used gibberellic acid (GA 3 ) was H : 150 ppm, H 3 : 200 ppm H 4 : 250 ppm, H 5 : 300 ppm and H 6 1 : 350 ppm. Data were collected on plant height (cm), number of branch plant -1 , number of leaves plant -1 -1 , L 3 : 1.0 t ha : control, H , leaf area plant ), fresh weight plant -1 (g), dry weight plant -1 (g), fresh leaf yield plant -1 -1 (cm (g), dry leaf yield plant (g), fresh leaf yield ha -1 (kg), dry leaf yield ha -1 (kg), N(%), P (%), K (%), S (%), Ca (%), Mg (%), Zn (µg g -1 ) of stevia leaf, initial and post harvest soil analysis. Significant variations were observed on plant height, number of leaves plant -1 , leaf area plant -1 (cm 2 ) number of primary and secondary branch plant -1 in different level of lime application. Highest plant height, number of leaves plant -1 , leaf area plant -1 (cm 2 ) number of primary and secondary branch plant -1 was observed in L 3 (lime 1.0 t ha -1 ) treatment and the lowest was in L (control) treatment at 21 DAT to 147 DAT, respectively. Applying 300 ppm GA was the significant effect in increasing at 21 DAT to 147 DAT, respectively and the lowest plant height, number of leaves plant -1 , leaf area plant -1 (cm 2 3 ) number of primary and secondary branch plant was observed in control (GA 3 ) treatment. The highest plant height, number of leaves plant , leaf area plant -1 (cm 2 ) number of primary and secondary branch plant -1 heights was in L (lime 1.0 t ha -1 × GA 3 300 ppm) treatment and the lowest was found in L 1 H at all growth stages. N, K, Mg, Zn content of stevia leaf was significantly affected by different levels of lime and GA 3 1 . The highest N, K, Mg, Zn content was observed when the plot was treated with lime 1.0 t ha -1 × 300 ppm GA 3 (L 3 H ) and the lowest N, K, Mg, Zn content was recorded in the control treatment. Significantly highest fresh weight plant 5 -1 , fresh weight ha -1 1 , dry weight plant , dry weight ha -1 was observed in L 3 treatment and lowest was observed in L treatment in stevia plant. The interaction effect of lime and GA 3 1 in most of the combination showed significantly the highest fresh weight plant -1 , fresh weight ha -1 , dry weight plant -1 , dry weight ha , fresh leaf yield ha -1 and dry leaf yield ha -1 was observed in L 3 H 5 and lowest was observed in L treatment. Thus, the application of lime and gibberellic acid (GA ) had positive impact on leaf yield components resulted in higher yield of study. From the result it can be recommended that lime 1.0 t ha -1 and GA 3 3 300 ppm is suitable for field cultivation of stevia production. Therefore, these findings infer that lime 1.0 t ha -1 and GA 300 ppm might help in producing more stevia leaf in Old Himalayan Piedmont Plain soil especially in Northwest of Bangladesh for environment friendly management practices. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AGRICULTURAL CHEMISTRY Sat, 01 Jan 2022 00:00:00 GMT http://localhost:8080/handle/123456789/5102 2022-01-01T00:00:00Z http://localhost:8080/handle/123456789/5101 EFFECT OF NITROGEN AND NAPTHELIC ACETIC ACID ON GROWTH, YIELD AND NUTRIENT CONTENT OF STEVIA (Stevia rebaudiana Bertoni) HOSSAIN, MD. SOHAG The experiment was conducted to study the effect of nitrogen and napthelic acetic acid on growth, yeild and nutrient content of stevia. The trail was laid out in Randomized Complete Block Design (RCBD) with three replications. The treatments (nirogen) used were N 1 : control, N 2 : 105 kg ha -1 , N 3 : 140 kg ha -1 , N 4 : 175 kg ha -1 , N 5 : 210 kg ha -1 . The applied napthelic acitic acids (NAA) were H 1 : control, H 2 : 50 ppm, H 3 : 100 ppm and H 4 : 150 ppm. Data were collected on plant height (cm), number of branch plant -1 , number of leaves plant -1 , leaf area plant ), fresh weight plant (g), fresh leaf yield ha -1 (g), dry weight plant -1 -1 (kg), dry leaf yield ha (g), fresh leaf yield plant -1 -1 -1 (cm (g), dry leaf yield plant (kg), N(%), P (%), K (%), S (%), Ca (%), Mg (%), and Zn (µg g -1 ) of stevia leaf along with initial and post harvest soil analysis. Significant variations were observed in plant height, number of leaves plant -1 , leaf area plant ) number of primary and secondary branch plant -1 in different level of nitrogen application. Significant the highest plant height, number of leaves plant -1 , leaf area plant -1 (cm 2 ) number of primary and secondary branch plant -1 was observed in N 3 -1 (cm 2 treatmnet and the lowest was observed in N 1 (control) treatment at 21 DAT to 147 DAT, respectively. Applying 100 ppm NAA was the significant effect in increasing height in H 3 (100 ppm NAA) at 21 DAT to 147 DAT, respectively and the lowest plant height, number of leaves plant -1 , leaf area plant ) number of primary and secondary branch plant -1 was observed in control (NAA) treatment. The highest plant height, number of leaves plant -1 , leaf area plant -1 (cm 2 ) number of primary and secondary branch plant -1 heights was found in N 3 H 3 treatment and the lowest was found in N 1 (with no nitrogen application × with no NAA application) at all growth stages. The N, K, Mg, and Zn content of stevia leaf was significantly affected by different levels of nitrogen and NAA. The highest N, K, Mg, and Zn content was observed when the plot was treated with nitrogen140 kg ha -1 × 100 ppm NAA (N 3 H 3 ) and the lowest N, K, Mg and Zn content was recorded in the control treatment. Significantly highest fresh weight plant -1 , fresh weight ha -1 -1 (cm 2 H 1 , dry weight plant , dry weight ha -1 was observed in N 3 treatment and lowest was observed in N 1 treatment in stevia plant. The intraction effect of nitrogen and NAA in most of the combination should significantly the highest fresh weight plant -1 , fresh weight ha -1 , dry weight plant -1 , dry weight ha , fresh leaf yield ha -1 and dry leaf yield ha -1 was observed in N 3 H 3 -1 treatment and lowest was observed in N 1 treatment. The intraction effect of nitrogen and NAA in most of the combination should significantly the highest fresh weight plant -1 , fresh weight ha -1 1 , fresh leaf yield ha -1 and dry leaf yield ha -1 was observed in N 3 , dry weight plant H 3 and lowest was observed in N 1 H 1 treatment. Thus, the application of nitrogen and napthelic acitic acid had positive impact on leaf production resulted in higher yield economic stevia. From the result it can be recommended that nitrogen 140 kg ha -1 and NAA 100 ppm is might be suitable for commercial field cultivation of stevia production in Bangladesh. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AGRICULTURAL CHEMISTRY Sat, 01 Jan 2022 00:00:00 GMT http://localhost:8080/handle/123456789/5101 2022-01-01T00:00:00Z