http://localhost:8080/handle/123456789/2784 2026-04-18T01:43:59Z http://localhost:8080/handle/123456789/3477 ALLEVIATION OF LOW TEMPERATURE INJURY IN TOMATO WITH SALICYLIC ACID AND CALCIUM AFSANA, NIGAR 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 (MS) IN AGRICULTURAL BOTANY 2015-01-01T00:00:00Z http://localhost:8080/handle/123456789/438 ALLEVIATION OF SALT STRESS IN WHEAT WITH SALICYLIC ACID AKHER, SAYED ABDUL A pot experiment was conducted in the farm of Sher-e-Bangla Agricultural University, Dhaka, during Rabi season, November 2014 to March 2015 to examine the role of salicylic acid on alleviation of salt stress in wheat. In this experiment, the treatment consisted of four different salinity levels viz. S0 = without salt (control), S1 = 2.8 g NaCl kg-1 soil ≈ 3-4 dSm-1, S2 = 6.0 g NaCl kg-1 soil ≈ 7-8 dSm-1, S3 = 9.0 g NaCl kg-1 soil ≈ 11-12 dSm-1 and three different levels of salicylic acid viz. A0 = 0 mM, A1= 0.2 mM and A2 = 0.4 mM. The experiment was laid out in two factors Randomized Complete Block Design (RCBD) with four replications. The total treatment combinations were 12 (4x3). Results of the experiment showed a significant variation among the treatments in respect of most of the studied parameters. The morpho-physiology, yield contributing characters and yield of wheat are affected by different levels of salinity. The higher levels of salinity showed greater reduction of growth, development and yield component to control or without NaCl. The morphological characters such as plant height, leaf number, both total tiller and effective tiller number plant-1; physiological parameter membrane stability, fresh and dry weight plant-1, yield contributing characters such as number of spikelet spike-1, number of grains spike-1, grain weight spike-1, 1000 grain weight and yield of wheat significantly decreased due to salinity. Separately exogenous application of SA improved the morpho-physiology, yield contributing characters and yield of wheat. The foliar application of SA increased plant height, leaf number, both total tiller and effective tiller number plant-1, fresh and dry weight plant-1, number of spikelet spike-1, number of grains spike-1, grain weight spike-1, 1000 grain weight and yield of wheat. At salt stress, the SPAD value which indicates chlorophyll content did not show any significant difference due to salicylic acid. These results indicate that salicylic acid has positive effect on reproductive attributes of wheat. The interaction between different levels of salinity and salicylic acid influenced on almost all morpho-physiological parameters and yield contributing characters and grain yield of wheat. The SPAD value of leaf of wheat did not show any difference with interaction effect of salinity and salicylic acid. The highest grain yields (1.55 t ha-1) were recorded at S0A2 (Without Salt + 0.4 mM SA) treatment combination which did not show any difference with S0A0 (Without Salt+ Without SA) and S0A1 (Without Salt + 0.2 mM SA). But the grain yield was gradually decreased with the increasing level of salinity. The application of SA increased the grain yield differently according to the levels of salinity. The minimum grain yields were found 1.14 t ha-1, 1.07 t ha-1 and 0.26 t ha-1 at 3-4 dSm-1, 7-8 dSm-1 and 11-12 dSm-1 NaCl respectively. These yields were increased with SA (0.4 mM) from 1.14 to 1.32 t ha-1, 1.07 to 1.14 t ha-1 and 0.26 to 0.31 t ha-1 at 3-4 dSm-1, 7-8 dSm-1 and 11-12 dSm-1 NaCl respectively. These results suggest that SA can alleviate the detrimental effects of salinity to increase the grain yield of wheat. 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 BOTANY SEMESTER: JANUARY-JUNE, 2015 2015-06-01T00:00:00Z http://localhost:8080/handle/123456789/437 PHYSIOLOGICAL BEHAVIOUR AND YIELD PERFORMANCE OF HYBRID RICE VARIETIES IN AEROBIC AND ANAEROBIC CONDITIONS ISLAM, MD. SHORIFUL The experiment was conducted at the Research Farm of Sher-e-Bangla Agricultural University, Dhaka from November, 2015 to May, 2016 to study the physiological behaviour and yield performance of hybrid rice varieties in aerobic and anaerobic conditions. The experiment was comprised of two factors- 1)System of cultivation: three (3) viz. Low land transplant (anaerobic) condition, Raised upland (aerobic) condition, and Raised transplant (aerobic) condition, and (2) Variety: five (5) viz. BRRI hybrid dhan3, Bolaka, Moina, Gold and BRRIdhan45. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Significant variation was observed on growth, yield and yield contributing parameters. All the studied hybrid varieties showed superiority in respect of physiological characters, yield and yield attributes in anaerobic condition over aerobic condition. BRRI hybrid dhan3 accumulated the highest amount of chlorophyll (2.47 mg g-1) in its flag leaves at anaerobic condition which was at par with Bolaka and BRRI dhan45 contained the minimum chlorophyll (1.83 mg g-1) at raised transplant condition. BRRI hybrid dhan3 showed the highest leaf area index (4.25),while the minimum leaf area index was found in BRRIdhan45 (3.56). The highest (34.97%) shoot reserve translocation was exhibited by BRRI hybrid3 and closely followed by Gold at low land transplant condition. The minimum shoot reserve translocation was recorded from BRRIdhan45(7.78%) at raised transplant condition. The highest grain dry matter accumulated from current photosynthesis (85.87 %) was achieved from BRRI hybrid3at low land transplant condition andthe lowest was recorded from BRRI dhan45 (70.67%) at raised transplant condition.BRRI hybrid dhan3 provided the highest grain yield (8.05t ha-1) at low land transplant condition due to its higher filled grains panicle-1 and 1000 grain weight, and the lowest (4.28tha-1) was obtained from BRRIdhan45 atraised transplant condition. A Thesis Submitted to the Department of Agricultural Botany Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AGRICULTURAL BOTANY SEMESTER: JANUARY-JUNE, 2015 2015-06-01T00:00:00Z http://localhost:8080/handle/123456789/436 EFFECTS OF PLANT GROWTH REGULATORS ON FLOWERING BEHAVIOUR AND YIELD OF CUCUMBER FARHANA, UMME A field experiment was conducted at the farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from February, 2015 to July 2015 to study the effects of plant growth regulators on flowering behaviour and yield of cucumber. The experiment considered of nine plant growth regulators viz. T0= 0 ppm (control), T1= MH 100 ppm , T2= Silver nitrate 250 ppm, T3= Ethophon 250 ppm, T4= GA3 300 ppm , T5= MH 200 ppm, T6= Silver nitrate 500 ppm, T7= Ethophon 500 ppm, T8= GA3 500 ppm. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Data were collected on stem length, number of primary branches per plant, days required to first female flower and male flower, days to 50% flowering per plot, total number of male and female flowers per pant, number of fruit per plant, fruit length and diameter, weight fruit per plant, yield of fruits. A statistically significant variation was recorded in terms of all the characters related to growth and yield of cucumber. The maximum stem length and number of branches per plant was produced by 500 ppm gibberelic acid. The GA3 500 ppm required the earliest of days of female first flowering and 50% flowering. The maximum number of male flowers per plant was produced by Silver nitrate 250 ppm treatment. The maximum number of fruit per plant, fruit length and fruit diameter were produced by GA3 500 ppm treatment. The maximum yield of fruits per plant (2.38 kg) was produced by GA3 500 ppm treatment. The minimum yield of fruits per plant (1.13 kg) was produced from control treatment. The maximum yield of fruits per hectare (16.72 tones) was obtained GA3 500 ppm treatment and the minimum yield of fruits per hectare (6.74 tones) was obtained from control treatment. Finally, it can be said that it is possible to increase female flower as well as yield of cucumber by suppressing male flower with the help of applying GA3 at the rate of 500 ppm. A Thesis Submitted to the Department of Agricultural Botany Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN AGRICULTURAL BOTANY SEMESTER: July-December, 2013 2015-06-01T00:00:00Z