A total of six separate trials were conducted at farmer’s fields in Sylhet area for two consecutive crop seasons during 2017-18 and 2018-19 to evaluate the performance of improved crop varieties with the existing cultivars cultivated by the farmers. The study areas are located at Latitude 24° 29' N and Longitude 91° 39' E of Bangladesh. The soil of experimental plots was non-calcareous gray with low organic matter content (1.23%), low soil pH (4.5-5.4), very low total N (0.06%), low content of P (9.46 µg/g), K (0.14) and S (10.07) whereas Zn (1.13) and Boron (0.51) medium and optimum, respectively. Each experiment was laid out in randomized complete block design with six dispersed replications. The unit plot size was varied with the experiments. The monthly mean minimum and maximum temperatures were 9.530C and 36.430C during the crop season, respectively. During experimentations a total of 7684 mm precipitation has occurred in this region; whereas the lowest rainfall 10.9 mm and the highest 2465 mm was occurred in January and June, respectively. The on-farm trial was conducted at the farming system research and development (FSRD) site, Kamalbazar, South Surma, Sylhet. Six mustard varieties viz. BARI Sarisha-9, BARI Sarisha-11, BARI Sarisha-13, BARI Sarisha-14, BARI Sarisha-15, and BARI Sarisha-16 were used in this field trial. The crop was fertilized with 90-27-32-10-1.0-0.5 kg ha-1 of NPKSZnB (FRG, 2012). Half of the nitrogen and all amounts of phosphorous, potassium, sulpher, zinc, and boron were applied during the final land preparation. The remaining half nitrogen was applied as top-dressing at the time of flower initiation. The experiment was conducted under rainfed conditions. The seeds were sown on 20-25 November in a broadcast method in both years maintaining the seed rate of 7-8 kg ha-1. The unit plot size was 12 m x 20 m. The crop was harvested on18-25 February in both years. Pesticides Rovral 50 WP 0.2 % for controlling gray blight and Nitro 505 EC @ 0.5 ml L-1 of water were used against mustard aphid. The experimentation was conducted at farmer’s field under farming system research and development (FSRD) site, Kamalbazar, South Surma, Sylhet. Three soybean varieties viz. BARI Soybean-5, BARI Soybean-6, and Shohag were used in this experiment. A cop was fertilized with 23-30-50-15-1.0 kg ha-1 of NPKSB (FRG, 2012). All fertilizer nutrients were applied during the final land preparation. Seeds of soybean were sown on 15-18 December in a broadcast method in both years with maintained the seed rate of 80-90 Kg ha-1. The unit plot size was 8 m x 5 m. The crop was harvested at full maturity on 5-10 April in both years. There was no remarkable disease and pest invasion, except whitefly and it was successfully controlled by applying Nitro 505 EC at the rate of 0.5 ml L-1. The experiment was conducted at a farmer’s field under multilocation testing (MLT) site, Sunamganj. The experimental material comprised of two varieties viz. BARI Chinabadam-8 and BARI Chinabadam-9 including local were used in this experiment. The seeds of groundnut were sown on 2-5 November in both years with maintaining the spacing of 40 cm x 15 cm. The unit plot size was 8 m x 5 m; where a total of 650 plants were accommodated and harvested on 5-7 March in both years with maintaining 90-100 kg seeds ha-1. Before sowing, seeds were treated with Provex @ 0.2% to prevent seed and soil-borne diseases. Weeding followed by irrigations were done twice at 15-20 and 45-50 days after sowing of seed and earthing up was followed as per package of practices of groundnut (Pradheeban et al., 2016). The crop was fertilized with 25-160-85-300-10 kg urea-TSP-MoP-Gypsum- Boric acid ha-1. The half urea and entire amount of TSP, MP, gypsum, and boric acid were applied during the final land preparation. The rest half urea was top-dressed at the initial stage of peg developments. The on-farm trial was conducted at the upper part of the Hakaluki haor, Beanibazar area under Sylhet. Four sesame varieties viz. BARI Til-2, BARI Til-3, BARI Til-4, and T-6 were used in this trial. The unit plot size was 10 m x 10 m. Seeds were sown in the broadcast method. The fertilizer nutrients NPKSZnB @ 60- 30-40-18-2-0.5 were applied in the form of urea, TSP, MoP, Sulpher, Gypsum, and Boron, respectively as per FRG 2012. A full dose of all fertilizers and half of urea was applied at the time of final land preparation. The remaining nitrogen was applied as top-dressing at 25-30 days after sowing. The trial was conducted under rainfed conditions. Sesame seeds (7-8 kg ha-1) were sown on 15-18 March in both years. The crop was harvested at full maturity on 12-15 June in both years. Intercultural operations viz. weeding and thinning were done in order to support normal plant growth. The experiment was conducted at a farmer’s field under the multilocation testing (MLT) site, Zokiganj. Four different cultivars of linseed viz. BARI Tisi-1 (Nila), Noakhali local, Patuakhali local, and Zokiganj local were tested in this field trial. The crop was fertilized with 31-13-20-8 kg ha-1 of NPKS (FRG, 2012). Half of the nitrogen and all phosphorous, potassium and sulpher were applied during final land preparation. The remaining nitrogen was applied at the time of flower initiation as a top dress. The seeds (7-8 kg ha-1) were sown on 20-25 November in both years in the broadcast method. The unit plot size was 10 m x 8 m. Once weeding followed by irrigation was provided 30-35 days after sowing. The crop was harvested at maturity on 13-15 March in both years. The fungicide Bavistin 70 WP (0.2 %) was applied for controlling foot rot disease and in order to support normal growth of linseed. The field trial was conducted at the farming system research and development (FSRD) site, Kamalbazar, South Surma, Sylhet. Three sunflower varieties viz. BARI Surjomukhi-2, BARI Surjomukhi-3, and Hysun-33 were used in this experiment. The crop was fertilized with 90-35-75-25-1.0-0.5 kg ha-1 of NPKSZnB (FRG, 2012). Half of the nitrogen and all phosphorous, potassium, sulpher, zinc, and boron was applied during the final land preparation. The remaining nitrogen was applied as top-dressing in two equal splits at 20-25 and 40-45 days after sowing (DAS). The seeds (10-12 kg ha-1) were sown on 15- 20 November in both years maintaining the spacing of 50 cm x 30 cm. The unit plot size was 8 m x 5 m. The crop was harvested on 25-28 February in both years. Seeds were treated with Provex-200 @ 3g kg-1 before sowing. Twice irrigations were done at 30 and 50 days after sowing of seed. The yield data were recorded from a whole plot basis. Yield and yield contributing characters were analyzed statistically using the “STAR” software package and means were separated by LSD test at a 0.05 % level of significance.