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The experiment was carried out to investigate the effect of nutrient combinations and spacing on the growth performance of mungbean (BARI mung 5) using split plot design. The experiment comprised of 3 levels of spacing; S1- 20 cm × 10 cm, S2- 30 cm × 10 cm and S3- 45 cm × 15 cm; and 6 levels of fertilizers; F0- Control (without fertilizer), F1- Recommended dose of NPK, F2- 5 t ha-1 cowdung, F3- 5 t ha-1 cowdung + Recommended dose of NPK, F4- 2.5 t ha-1 cowdung + Recommended dose of NPK and F5- 2.5 t ha-1cowdung + ½ Recommended dose of NPK. Among different treatments maximum number of leaves (13.70), branches (2.44) and dry weight (10.97g) was recorded from S3 at 60 DAS on the other hand highest number of leaves (13.83) found in F4 and dry matter (8.89g) in F3 at 60 DAS. However, when combined with fertilizers and spacings, the S3F4 treatment had the highest dry matter weight (12.7g) before harvest. In terms of yield performance, applying cowdung @ 2.5 t ha-1 along with recommended NPK resulted in the highest seed yield (1156.7 kg ha-1). The number of plant populations was higher in S2 (30 cm 10 cm) than in S3 (45 cm × 15 cm), so S2 produced the highest grain yield (1022.8 kg ha-1). It is clear that different fertilizer combinations and spacings have a significant impact on mungbean growth performance. S2F4 combinations may be the best choice for improved mungbean cultivation. SAARC J. Agric., 21(1): 189-201 (2023)

An experiment was carried out at the Agronomy Research Farm of Sher-e-Bangla Agricultural University, Dhaka during the period from November 2018 to June 2019 to study the nitrogen requirement of boro rice grown with floating duckweed. The experiment was laid out in a Factorial Randomized Complete Block Design with three replications. The treatments were duckweed: viz. D0 = Control (0 g duckweeds m-2), D1 = 200 g duckweeds m-2, D2 = 400 g duckweeds m-2 and D3 = 600 g duckweeds m-2) and nitrogen treatment: N1 = 45 kg N ha-1, N2 = 90 kg N ha-1 and N3 = 180 kg N ha-1). Different doses of duckweeds showed significant influence on most of the parameters of which D2 (400 g duckweeds m-2) treatment the best performance on growth and yield parameters of rice. Among different doses of nitrogen, N2 (90 kg N ha-1) gave the best results on growth and yield parameters of rice. In case of combined effect, D2N2 showed the highest number of tillers hill-1 (16.40), dry weight hill-1 (48.97 g), number of effective tillers hill-1 (14.73) and number of grains panicle-1 (189.50). This treatment combination also showed the highest number of filled grains panicle-1 (183.90), panicle length (25.83 cm), 1000 -grain weight (25.13 g), seed yield (7.24 t ha-1), straw yield (8.47 t ha-1), biological yield (15.71 t ha-1) and harvest index (46.09%). On the other hand, D0N3 gave the least results on these parameters. Findings revealed that application of 400 g duckweeds m-2 with 90 kg N ha-1 showed the superiority over other treatment combinations to produce higher grain yield of boro rice. Bangladesh Agron. J. 2022, 25(2): 109-117

Mungbean production is decreasing because of inappropriate management of fertilizer and plant population so a study was initiated to find out the effect of different combinations of organic and inorganic fertilizers with different plant geometry on the yield of mungbean var. BARI Mung-5. The experiment was laid out in a split- plot design with three replications. The experiment comprised of three level of plant geometry viz. S1= 20 cm × 10 cm, S2= 30 cm × 10 cm and S3= 45 cm × 15 cm, and six level of fertilizers: F0= Control (without fertilizer), F1= Recommended dose of NPK, F2=5 t ha-1 cowdung, F3=5 t ha-1cowdung with recommended dose of NPK, F4= 2.5 t ha-1 cowdung with recommended dose of NPK and F5=2.5 t ha-1 cowdung with half recommended dose of NPK. Among the three spacing, 30 cm × 10 cm (S2) produced maximum seed yield (1022.8 kg ha-1) while the lowest in S3 (834.4 kg ha-1). Cowdung had a significant effect on the seed yield and yield attributes of mungbean. The maximum seed yield (1038.9 kg ha-1) was obtained F4 while minimum (930.0 kg h-1) by applying cowdung @5 t ha-1. Among the treatment combinations, S2F4 was showed maximum yield (1156.7 kg ha-1) when considering stover yield and biological yield. Plant spacing of 30 cm × 10 cm along with 2.5 t ha-1 with recommended dose of 40, 80, 30 kg ha-1 of Urea, TSP, MoP could be more beneficial for the farmers to get maximum yield from var. BARI Mung-5. Bangladesh Agron. J. 2022, 25(2): 97-107

Weed pressure is an additional threat to high temperature stressed wheat crop for its optimum production. A field experiment was conducted at Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during Rabi 2017-2018 to assess the response of wheat varieties to different weed managements and its economical viability. As such three varieties i.e. BARI Gom-28, BARI Gom-29, and BARI Gom-30 along with five weed managements viz. control (no weeding), two hand weeding at 20 and 40 DAS, Panida 33EC (Pendimethalin) @ 2000 ml ha-1 spray at 5 DAS as pre-emergence, Affinity 50.75 WP (Isoproturon) @ 1500 g ha-1 spray at 25 DAS as post-emergence and Panida 33EC (Pendimethalin) @ 2000 ml ha-1 at 5 DAS + Affinity 50.75 WP (Isoproturon) @ 1500 g ha-1 at 5 & 25 DAS were treatment variables tested under split plot design.Cynodon dactylon, Cyperus rotundus, Echinochloa colona, Eleusine indica, Chenopodium album, Alternanthera philoxeroides, Brassica kaber, Leliotropium indicum, Vicia sativa,etc.werethe major weeds as determined based on their field intensity.Results revealed that BARI Gom-30 out-yielded other varieties with the highest grain yield (3.01 t ha-1). Pre-emergence application of Panida 33EC at 5 DAS proved as suitable weed management compared to other methods. BARI Gom-30 in combination with Panida 33EC @ 2000 ml ha-1 spray at 5 DAS as pre-emergence gave higher yield and yield attributes while BARI Gom-28 under no weeding check showed lower grain yield (2.09 t ha-1). Economically maximum gross return (Tk.75761.52ha-1),net income (Tk.21775.92ha-1), and BCR (1.41) were associated with Panida 33EC treatment when minimum values were obtained in the control plot (no weeding). So, the application of pre-emergence herbicide, Panida 33EC might be economically viable weed management ensuring a higher yield in wheat cultivation. Bangladesh Agron. J. 2020, 23(2): 119-125