http://localhost:8080/handle/123456789/4658 2026-04-08T16:17:41Z http://localhost:8080/handle/123456789/4934 CALCIUM INDUCED CHANGES IN EARLY SEEDLING GROWTH OF RICE (Oryza sativa L.) UNDER SALT STRESS ASRAFI, MOST. MAHMUDA Salt stress is a severe limiting factor for rice production worldwide. So a pot experiment was conducted at the research field of the Department of Agroforestry and Environmental Science, Sher-e-Bangla Agricultural University, Dhaka during the period from February 2021 to April 2021 to find out the effect of calcium in mitigation of salt stress in BRRI dhan 28 (inbreed) with nine treatments in combination with three doses of NaCl (0 mM, 50 mM and 100 mM) and three doses of CaCl 2 (0 mM, 2.5 mM and 5 mM) in completely randomized design with three replications. Salt stress drastically damaged morpho-physiological attributes and growth performance of rice in dose dependent manner. In contrast use of 2.5 mM CaCl 2 under salt stress had positive impact on plant height, relative growth rate, number of leaves per plant, length of flag leaf, width of flag leaf, fresh weight of plant, dry weight of plant, relative water content (RWC) and SPAD value at 25, 40 and 55 at days after sowing (DAS) under both level of salt stresses. But addition of 5 mM CaCl 2 showed good result under 50 mM NaCl stress only. So, addition of 2.5 mM CaCl 2 in fertilization process might be a solution for rice production under salt stress. 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 AGROFORESTRY AND ENVIRONMENTAL SCIENCE 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4933 EFFECT OF N AND P ON THE PERFORMANCE OF SPINACH (Spinacia oleracea) IN ROOFTOP AND FARM JOHRA, MST. FATEMA TUJ The experiment was conducted at the rooftop of Soil Science Department and research farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from October 2020 to December 2020 to study the performance of spinach in the rooftop and farm. The experiments were laid out in RCBD design with three replications. The study consists of two factors. Factor A: Three levels of nitrogen N₀ (control), N₁ (56 kg ha¯¹), and N₂ (84 kg ha¯¹), and Factor 2: Three levels of phosphorus P₀ (control), P₁ (36 kg P 2 O 5 ha¯¹) and P₂ (57.5 kg P 2 O 5 ha¯¹). Haldibari, local variety seed was used in this experiment. Different growth and yield contributing parameters were recorded to determine the optimum dose of N and P for growing on rooftop and farm. The result reveals that N₁ (56 kg ha¯¹) is optimum dose for growing spinach on both rooftop and farm whereas, P₁ (36 kg P 2 O 5 ha¯¹) and P₂ (57.5 kg P 2 O 5 ha¯¹) are optimum dose for rooftop for farm condition respectively. Among the treatment combination, N₁P₁ (56 kg/ha N + 36 kg/ha P₂O 5 ) seems to be more suitable for getting higher yield in both rooftop and farm. 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 AGROFORESTRY AND ENVIRONMENTAL SCIENCE 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4932 SHADE INDUCED EFFECT ON GROWTH PERFORMANCE OF DIFFERENT CAULIFLOWER (Brassica oleracea var. botrytis) VARIETIES SAHA, GOPAL In agroforestry system, light is a limiting factor for maximum crop production. Therefore, a pot experiment was conducted in the Field Laboratory of the Department of Agroforestry and Environmental Science, Sher-e-Bangla Agricultural University, Dhaka- 1207, during the months of October 2020 to March 2021 with three cauliflower varieties viz. V 1 (Chandi), V 2 (Snow White), V 3 (Indian Crown) under four shade treatments/light intensities, [100%, 75%, 50% and 25% light intensity which indicate control (S 0 ), S 1 , S 2 and S 3 , respectively] to evaluate their morpho-physiological and growth performances. Low light stress [mainly 50% light intensity (S 2 ) and 25% light intensity (S 3 )] substantially reduced the germination rate, plant height, plant weight (fresh and dry weight), leaves number, leaf length, leaf width, flowering dates, stem diameter, photosynthetic performance (SPAD value) of different cauliflower varieties. However, considering the obtained findings Snow white variety showed less negative performance than the other varieties under shaded condition. So, among the tested cauliflower varieties Snow white might be suitable for shaded condition with low light intensities. 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 AGROFORESTRY AND ENVIRONMENTAL SCIENCE 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4931 MORPHO-PHYSIOLOGY AND YIELD OF TOMATO (Solanum lycopersicum L.) VARIETIES AFFECTED BY DIFFERENT LEVELS OF LIGHT INTENSITY MANDAL, SUMIT Light stress is a limiting factor for crop production, especially in agroforestry system. A pot experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka- 1207, during the months of October 2019 to mid-April 2020 in a completely randomized design (CRD) to determine the effect of low light on morpho-physiology and yield of tomato. Three tomato varieties viz. BARI Tomato-2, BARI Tomato-15, BARI Tomato-16 were exposed to four light intensities including 100% (S 0 , control), 75% (S 1 ) , 50% (S 2 ) , and 25% (S 3 ) to evaluate their performances. Light stress (mainly S 2 and S 3 ) substantially hampered the plant growth, development as well as yield. Low light stress primarily reduced the photosynthetic performance of plants which contributes in reduction of plant height, number of primary branches, and leaves of all tomato plants. Moreover, low light intensity negatively affected the fresh and dry weight of tomato. It also decreased the number of fruits, fruit length, fruit diameter, and individual fruit weight in all varieties. As a result, plant wise tomato production was hampered seriously with low yield. In comparison with control, S 1 condition decreased tomato yield per plant by 22.5, 16.9 and 15.3% in BARI Tomato-2, BARI Tomato-15 and BARI Tomato-16, respectively. Under S 2 condition, tomato yield per plant decreased by 38.7, 37.4, and 32.7% in BARI Tomato-2, BARI Tomato-15 and BARI Tomato-16, respectively, in contrast to control. Lastly, S 3 condition decreased tomato yield per plant by 73.1, 67.0 and 62.1% in BARI Tomato-2, BARI Tomato-15, and BARI Tomato-16, respectively, compared with control. From this result, it was clear that BARI Tomato-16 was more tolerant to low light stress than BARI Tomato-2 and BARI Tomato-15. 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 AGROFORESTRY AND ENVIRONMENTAL SCIENCE 2021-01-01T00:00:00Z