A field trial was conducted at Agronomy Farm of Bangladesh Rice Research Institute to find out the effect of crop establishment method and nutrient management on yield performance of BRRI developed short-duration Aman rice var. BRRI dhan62 during July to October 2016. The trial comprised of four crop establishment methods viz., M1 = BRRI recommended puddle transplanting, M2 = System of rice intensification (SRI) method (9-days old seedling transplantation), M3 = Sprouted seed in line sowing and M4 = Sprouted seed in broadcasting and three nutrient management levels viz.,N1 = BRRI recommended nutrient management, N2 = Soil test-based nutrient management, N3 = Control. The study was conducted in a factorial Randomized Complete Block Design with three replications. The result showed that planting methods had significant effects on the yield of rice. The SRI method along with BRRI recommended fertilizer dose produced the maximum grain yield of 4.49 t ha-1 which was statistically similar with that produced in SRI method day- and soil test-based nutrient management combination. The highest gross margin (Tk. 36,308.00 ha-1) and cost benefit ratio (2.06) were observed in direct seeding of sprouted seed in line sowing method along with BRRI recommended fertilizer dose. So, direct seeding of sprouted seed in line could be a suitable planting method due to reduction of 26.0% production cost associated with seedling raising and transplanting operations. Bangladesh Agron. J. 2018, 21(1): 117-123

Herbicides are used successfully for weed control in rice fields for rapid effect, easier to application and low cost involvement in comparison to the traditional methods of hand weeding. Sulfentrazoneis a new pre-planting herbicide in Bangladesh. , pretilachlor 500 EC @ 1000 ml ha -1 , weed free and unweeded control. Visual assessment indicated that this herbicide possesses high selectivity and not toxic to rice plants. The results revealed that the major weed flora associated with the transplanted rice was mainly comprised of two grasses, two sedges and four broadleaves in Aman 2014 and two grasses, two sedge and two broadleaves in Boro 2014-15. The most dominant weeds were Cyperus difformis, Echinochloa crus-galli, Scirpus maritimus and Monochoria vaginalis in both the growing seasons. Application of Sulfentrazone 48 SC @ 200 ml ha -1 was most effective to suppress weed density and dry masses in both the seasons resulting increased grain yield more than 50% as compared to unweeded control. Therefore, Sulfentrazone 48 SC @ 200 ml ha -1 should apply two or three days before plantingfor effectively control weeds in rice.

An experiment was conducted at the Bangladesh Rice Research Institute (BRRI), Gazipur during Boro season of 2013-14 and 2014-15 to find out the nitrogen use efficiency and yield of boro rice var. BRRI dhan28 and BRRI dhan29 under four N management practices such as application of prilled urea using prilled urea applicator, application of USG (2.7gm) using USG applicator, broadcasting of prilled urea following three splits and a control (without urea). The experimental design was RCBD replicated thrice. BRRI dhan29 with urea broadcasted plots produced higher grain yield (7.38t ha-1) followed by BRRI dhan29 with USG application (6.65 t ha-1). Hand broadcasting with urea fertilizer showed 15.38.5and 2.5, 9.89% higher grain yield than machine application of prilled urea and USG in BRRI dhan28 and BRRI dhan29, respectively. Grain yield showed a significant quadratic response to N fertilization and significant linear response with total dry matter production in both the varieties. Higher total N was uptake from urea broadcasted plots in BRRI dhan29 followed by urea broadcasted from BRRI dhan28. BRRI dhan29 with Prilled urea applicator and BRRI dhan29 with USG treatment uptake intermediate nitrogen. N uptake in grain and total N uptake had a significant linear and quadratic response to N treatment in BRRI dhan28 and BRRI dhan29. Nitrogen use efficiency was higher in BRRI dhan29 compared to BRRI dhan28. Economic analysis showed that rice var. BRRI dhan28 and BRRI dhan29 with urea broadcast had the highest gross return of Tk.145145.00 and Tk. 158310.00 ha-1, respectively. However, the maximum cost (Tk. 151131) was involved for BRRI dhan29 with urea broadcasting, while the minimum with no urea fertilizer application for both the varieties. The highest marginal rate of return (MRR) (Tk.1146) was recorded from BRRI dhan28 with USG application using BRRI applicator.Bangladesh Agron. J. 2016, 19(1): 1-10

Field trials were conducted at Bangladesh Rice Research Institute (BRRI), Gazipur during aman, 2014 and boro, 2014-15 to evaluate the efficacy of metolachlor + bensulfuron methyl 20% WP on weed suppression of transplanted rice. Metolachlor + bensulfuron methyl 20% WP @ 150, 190 and 230 g ha-1 were applied and pyrazosulfuran ethyl @ 125 g ha-1, weed free and unweeded control were the treatment variables. Visual observations indicated that this herbicide possesses high selectivity and not toxic to rice plants. The results revealed that the major weed flora associated with the transplanted rice was mainly comprised of two grasses, two sedges and three broadleaf in aman and two grasses, two sedges and two broadleaf in boro season. The most dominant weeds were Cyperus difformis, Echinochloa crus-galli, Scirpus maritimus and Monochoria vaginalis in both the growing seasons. Application of metolachlor + bensulfuron methyl 20% WP @ 190 g ha-1 was most effective to suppress weeds in both the seasons resulting in increased grain yield more than 40% as compared to unweeded control. Therefore, metolachlor + bensulfuron methyl 20% WP@ 190 g ha-1applied at one to two leaf stage of weed effectively controls the weed infestation in transplanted rice. Bangladesh Agron. J. 2018, 21(1): 61-70

An experiment was conducted at the Agronomy Field of Sher-e-Bangla Agricultural University, Dhaka-1207 during the period from November 2011 to March 2012 to evaluate the performance of prilled urea and urea super granules (USG) on the growth and yield of wheat varieties. The experiment comprised of four wheat varieties viz., BARI Gom 21, BARI Gom 24, BARI Gom 25 and BARI Gom 26, and five nitrogen (N) levels viz., control (no Nitrogen), 84 kg ha -1 N from USG, and 30, 50 and 70 kg N ha -1 from prilled urea i.e., 67, 112 and 155 kg urea ha -1 . The experiment was laid out in a split-plot design with three replications where wheat varieties were placed in the main plot and nitrogenous fertilizers in sub-plots. Experimental results indicated that different varieties had the significant effect on plant height, number of tillers and dry weight plant -1 , and number of grains spike -1 , grain and straw yield, and harvest index. The variety BARI Gom 24 produced the highest grain yield (2.49 t ha -1 ) that mainly attributed by the maximum number of spikes plant -1 , number of grains spike -1 and 1000-grain weight. Among the different nitrogenous fertilizers 84 kg N ha -1 from USG (1.8 g) gave the highest grain yield (2.69 t ha -1 ) due to the maximum number of spikes plant -1 , maximum number of grains spike -1 and 1000-grain weight. The variety BARI Gom 24 produced the highest grain yield (2.80 t ha -1 ) with 80 kg N ha -1 from USG application.