http://localhost:8080/handle/123456789/4485 2026-04-09T01:45:44Z http://localhost:8080/handle/123456789/4651 THIOUREA-INDUCED DROUGHT STRESS TOLERANCE IN TWO CHICKPEA VARIETIES AHMED, NAZNIN Drought stress is one of the major constraints for crop production around the world; hence, a number of mechanistic approaches are required to mitigate the negative impact of drought stress. Two chickpea varieties BARI Chola-7 and BARI Chola-9 were studied to understand the effect of drought stress and the protective role of thiourea (TU) in improving drought stress tolerance. The experiment was conducted at the Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, from December 2019 to March 2020. The experiment consisted of sixteen treatments with four levels of drought stress: D 0 = no drought stress i.e. soil moisture at 100% field capacity (FC), D 1 = mild drought stress (25% depletiom from FC), D 2 = moderate drought stress (50% depletion from FC), D 3 = severe drought stress (75% depletion from FC) with and without 5 mM TU application. This study was carried out in a completely randomized design (CRD) with three replications. All the obtained data were subjected to one-way analysis of variance (ANOVA). In the current study, the highest reduction of plant height, root length, fresh weight and dry weight of shoot and root, number of branches plant −1 , RWC and chlorophyll (chl) content was found under severe drought stress in the two chickpea varieties compared to control. A sharp increase of malondialdehyde (MDA), H 2 O 2 and proline (Pro) content was observed under mild, moderate and severe drought stress. However, foliar spray of TU mitigated the oxidative damages under drought stress as reflected in improved growth and physiological parameters under mild and moderately stressed plants of both the varieties. Ascorbate (AsA) content was decreased and glutathione (GSH) and glutathione disulfide (GSSG) content were increased under D 1 , D 2 and D 3 . Between the two varieties, BARI Chola-9 was more tolerant compared to BARI Chola-7. Besides, TU has proved its beneficial effect against drought stress by increasing MDA, H 2 O 2 and Pro in mild and moderately stressed plants through modulating non-enzymatic antioxidants. Drought stress lowered the weight of 100seed, seed yield plant −1 , stover yield plant −1 and biological yield plant , which were further improved by foliar spray of TU under mild and moderate drought stress of both the chickpea varieties. Noteworthy that BARI Chola-7 could not survive till maturity and plant death in two treatments (V 1 D 3 TU 0 and V 1 D 3 TU) occured finally. Those two treatments were not considered for measuring yield parameters under drought stress. Nonetheless, TU did not show any significant effect in improving stress-inducing damage under severe drought stress. However, the effect of TU was more promising in ameliorating oxidative stress under mild and moderately stressed plants of BARI Chola-9 compared to BARI Chola-7. Thus it was concluded that TU foliar spray improved morphological, physiological, biochemical and yield parameters under mild and moderate drought stress of chickpea. −1 A Thesis Submitted to The Department of Agronomy, Faculty of Agriculture Sher-e-Bangla Agricultural University, Dhaka In partial fulfillment of the requirements for the degree of MASTERS OF SCIENCE (MS) IN AGRONOMY SEMESTER: JANUARY- JUNE, 2020 2020-06-01T00:00:00Z http://localhost:8080/handle/123456789/4558 INFLUENCE OF COWDUNG TO WATER STRESS MANAGEMENT IN WHEAT REZA, MD. SHAHIN An experiment was conducted in the net house of the Agronomy department, Sher-e-Bangla Agricultural University, Dhaka 1207 during the period from November 2018 to March 2019 to select the optimum dose of cow dung to manage water stress in wheat. The experiment was comprised of three factors viz. factor A: Variety- 2; i) V 1 = BARI Gom-28, ii) V 2 = BARI Gom-30; factor B: Cow dung doses- 5, i) C 0 = Recommended dose of chemical fertilizers (RDCF) + Control (Without cow dung), ii) C 1 = RDCF + 25% less cow dung of recommended dose, C 2 = RDCF + Recommended dose of cow dung, C 3 = RDCF + 25% higher cow dung of recommended dose and C 4 = RDCF + 50% higher cow dung of recommended dose; factor C: Water stress imposition by avoiding irrigation- 4; i) D 0 = Control (without Water stress), i) D 1 = Crown root initiation stage, ii) D 2 = Booting stage, iii) D 3 = Anthesis stage. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Data were collected on different aspects of yield attributes and yield of wheat. Results revealed that BARI Gom-30 gave the highest grain yield (5.73 g plant ). This may be attributed to the highest number of effective tillers plant (4.76), spike length (10.56 cm), spikelets spike −1 (15.01) and 1000-grains weight (46.67 g) in this variety. Considering cow dung application, C 4 (RDCF + 50% higher cow dung of recommended dose) was the highest grain yielder (5.72 g plant ) than other doses which may perhaps the highest effective tillers plant (5.60), spike length (10.82 cm), spikelet spike −1 (15.80), grains spikelet ii −1 −1 −1 −1 −1 (1.98), grains spike (30.92) and 1000-grains weight (49.19 g) in this treatment. In respect of Water stress imposition treatments, grain yield was found the highest in control treatment (without imposition of Water stress stress) and that of second highest was recorded in Water stress imposition at booting stage treatment (D 2 ). Regarding the interaction of variety, cow dung and Water stress imposition, the interaction of BARI Gom-30 × RDCF + 50% higher cow dung of recommended dose × without Water stress imposition (V₂C₄D₀) was the highest yielder among the other interactions which was attributed to higher effective tillers plant , spike length, spikelet spike −1 and 1000-grains weight, but interaction of V₂C₄D₂ may be suggested in case of water limited situation; as this interaction showed statistically similar and higher yield with V₂C₄D₀ interactions. A Thesis Submitted to the Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE (MS) IN AGRONOMY 2020-01-01T00:00:00Z http://localhost:8080/handle/123456789/4557 ALLEVIATION OF DROUGHT STRESS IN WHEAT BY DIFFERENT ORGANIC AMENDMENTS ISLAM, MD. NUR NABI Drought stress is one of the major threat of agricultural production. A pot experiment with organic amendments was conveyed at the experimental net house of the Department of Agronomy, Sher-e Bangla Agricultural University, Dhaka from November-February, 2018 to investigate the effect of drought stress on the growth, physiology and yield and the mollification capacity of drought in wheat using organic amendments. The experiment was carried out by BARI gom-26 and treatments were well-watered, water deficit and organic amendments viz. control (C), compost (CO) @10 t ha -1 , vermicompost (VC) @ 10 t ha -1 , poultry manure (PM) @10 t ha -1 , biochar (B) @ 2.5% w/w soil and chitosan (CH) @ 1% w/w soil. Drought stress reduced germination 7.48%, plant height 15.02%, SPAD value 15.91%, relative water content 13.44%, number of spikelet spike -1 16.92%, number of grains spike -1 11.73%, and hundred grains weight 17.83%. Application of organic amendments acts as a protectant and reduces drought stress condition and in most cases it enhanced above these growth, physiological, yield and yield attributes. Germination enhanced 11.82 % by compost application, SPAD value enhanced 17.52% by vermicompost, Plant height increased 16.01% by poultry manure, number of spikelets spike enhanced 19.92% by vermicompost, number of grains spike -1 increased 16.62% by vermicompost application than control under drought condition. Organic amendments prevents the production of reactive oxygen species and consequently prevents from oxidative stress. So, the present study concluded that organic amendments played significant role to alleviate drought and among these vermicompost performed better. A Thesis Submitted to the Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE (MS) IN AGRONOMY 2020-01-01T00:00:00Z http://localhost:8080/handle/123456789/4556 GROWTH AND YIELD OF BLACKGRAM AS AFFECTED BY LEAF CLIPPING SULTANA, AJMARY An experiment was conducted at Sher-e-Bangla Agricultural University farm, Dhaka to investigate the effect of variety and leaf clipping on the growth and yield of blackgram during March to June-2019. The experiment was consisted of two factors. Factor A: Blackgram variety (3); V 1 : BARI Mash-1, V 2 : BARI Mash-2 and V 3 : BARI Mash-3, and Factor B: Leaf clipping (4); C 0 : No leaf clipping (control), C 1 : Clipping of 1st basal leaf, C 2 : Clipping of 2nd basal leaves and C 3 : Clipping of total apical leaves having no inflorescence. The experiment was laid out in split plot design with three replications. Growth, yield and yield contributing characteristics like plant height, branches plant 1 -1 , above ground dry weight plant -1 , pod length, pods plant , thousand seed weight, seed yield, stover yield, biological yield and harvest index were compared under different treatments. Results indicated that variety and leaf clipping had significant effect on most of the growth and yield contributing characteristics of blackgram. In case of variety maximum value of the yield and yield contributing characteristics such as pod -1 length (8.99 cm), pods plant -1 (14.00), number of seeds pod -1 (9.78), 1000 seeds weight (48.58 g), and seed yield (1381.70 kg ha ), were observed in V 3 (BARI Mash-3) treatment. In case of leaf clipping maximum pod length (8.44 cm), pods plant -1 (15.18), seeds pod (9.32), 1000 seeds weight (48.33 g), seed yield (1306.7 kg ha -1 ), was observed in C 1 (Clipping of 1st basal leaf) treatment. In case of combined effect, V 3 C 1 (BARI Mash-3 and clipping of 1st basal leaf of blackgram) treatment was found superior in producing maximum pod length (9.32 cm), number of pods plant -1 (16.87), number of seeds pod -1 (10.80), 1000 seeds weight (51.67 g), and seed yield (1456.70 kg ha -1 ). The corresponding lowest values were obtained in V 1 C 3 (BARI Mash-1 along with clipping of total apical leaves having no inflorescence) treatment combination. So, BARI Mash-3 along with clipping of 1st basal leaf may improve growth & yield of blackgram. A Thesis Submitted to the Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE (MS) IN AGRONOMY 2020-01-01T00:00:00Z