To make potato production more sustainable for smallholder farmers, product diversification through processing is critical. On the other hand, the processing sector mandated some stringent standards in order to maintain product quality, hence potato quality evaluations are required for chip processing industries. Specific gravity, starch, reducing sugars, tuber dry matter, and chip color are all important characteristics to consider for processing. This study was designed to find suitable potato varieties with satisfactory attributes for processing chips, in comparison with other processing potato varieties. Keeping this in mind, the study was performed during the winter season of 2019–2020 and 2020–2021 in Bangladesh. Six processing types of potato varieties viz. BARI Alu-25 (Asterix), BARI Alu-28 (Lady Rosetta), BARI Alu-29 (Courage), BARI Alu-68 (Atlantic), BARI Alu-70 (Destiny), and BARI Alu-71 (Dolly) were evaluated for different quality parameters (specific gravity, dry matter, starch content, reducing sugar, chip color, and crispiness). The result of the study showed an ample variation in the studied parameters among the potato varieties. Among the varieties, BARI Alu-28 (Lady Rosetta) and BARI Alu-29 (Courage) were found better for all the quality parameters, such as dry matter, starch, reducing sugar, chip color, and crispiness, and could be recommended for the processing industries.

The present study deals with the investigation of the morphometric traits including morphometric lengths and length-length relationships (LLRs) of the dark evening brown butterfly, Melanitis phedima (Lepidoptera: Nymphalidae). Butterflies were sampled randomly from the Rajshahi University campus, Bangladesh. The pictures of butterflies were taken with a DSLR camera (Canon 750D), and a total of 14 different morphometric lengths from the body, antenna, wings (6 parameters), legs (2 parameters) and wing venation (4 parameters) were measured using ImageJ software (1.52a). The minimum and maximum body length (BL) were recorded at 19.15 mm and 24.85 mm from M. phedima respectively, whereas the mean body length was 22.02±1.45 mm. This study found FL (Foreleg) as the short trait at 12.90 mm, while FWBA (Forewing Base-Apex) was the long trait at 45.86 mm. The length of FWBA was 88.75% longer than BL and HWAT (Hindwing Apex-Tornus) was 40.25% longer. On the other hand, lengths of antennae length (AL), total foreleg (TFL) and total hindleg (THL) were shorter compared to BL. According to the coefficient of determination (r 2 ), all values were  0.75 which indicates the positive relationship between BL and selected 13 traits and the best-fitted model of LLRs was BL vs. HWBA (Hindwing Base-Apex) among these equations (r 2 = 0.89). The allometric coefficient 'b' indicated the isometric growth for BL vs. HWBT and BL vs. HWAT, and negative allometric growth for BL vs. FWBA (b < 1), and the rest 10 traits showed positive allometric growth (b > 1). The results would be very effective for the study of butterfly taxonomy as a great tool in species and subspecies identification.

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Aims: The main aim of this study was to find out the suitable variety having the export potentiality. Study Design: The experiment was laid out in a randomized complete block (RCB) design with the two replications in each location. Place of the Study: The study was conducted in ten different agroecological environments across the country, namely Bogura, Jashore, Munshiganj, Gazipur, Patuakhali, Faridpur, Debiganj, Madaripur, Thakurgaon and Rangpur district of Bangladesh during November 2020 to March 2021. Methodology: Sixty-two released potato varieties and exotic materials were used as planting materials for the experiment. Whole seed tubers of 28–40 mm were planted in the last week of November with a spacing of 60 cm between the rows and 20 cm between the plants. The crops were harvested at full maturity during March. Tuber yield was determined by adding the weights of marketable and unmarketable tubers from the net plot area and converting them to tons per hectare. After that, the tubers were graded in different grades and the dry matter of the potato was analyzed. Results: Considering the results, the location Rangpur, Thakurgaon, Debiganj and Bogura are the most suitable place for export variety cultivation in Bangladesh. The potato variety and genotypes 13.7, BARI Alu-12, BARI Alu-61, BARI Alu-68, BARI Alu-73 and Innovator were found promising for export for their yield, tuber size and dry matter content. Conclusion: The variety having good yield, bigger size and high dry matter could be selected for export from Bangladesh and the better-performed regions can be utilized for export quality potato production in Bangladesh.

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