Abstract
An experiment was carried out at Horticulture Farm of Bangladesh Agricultural University, Mymensingh during the period from October 2018 to March 2019 to examine the effects of different bulb size viz., large size bulb (15±1 g), medium size bulb (10±1 g), small size bulb (7±1 g) on seed production of two onion varieties (Taherpuri and Kalash Nagari). Significant variation observed in both varieties for most of the parameters based on onion bulb size. The variety Kalash Nagari showed better performances compared to variety Taherpuri. After 60 days of planting, Kalash Nagari variety gave the highest plant height (55.07 cm), number of leaves (20.62), stalk length (100.78 cm), and total seed yield (630 kg ha-1), while in Taherpuri plant height, leaf number, stalk length and total seed weight were 32.21 cm, 6.93, 61.47 cm and 270 kg ha-1, respectively. Large sized bulb gave better performance compared to small sized bulb. The large sized bulb gave highest plant height (49.83 cm) and highest total seed yield (490 kg ha-1). Medium size bulb gave the seed yield (460 kg ha-1) and lowest in small size bulb (390 kg ha-1). Seed yield was significantly affected by the combined effects of variety and bulb size. Kalash Nagari onion with large sized bulb gave the highest seed yield (660 kg ha-1) and Taherpuri variety with small sized bulb gave the lowest seed yield (180 kg ha-1).
 SAARC J. Agri., 18(2): 51-65 (2020)
Highlights
Onion (Allium cepa L.) is one of the most important bulb and major spice crop in Bangladesh
In a study of 60 vegetables, onions were reported to have the highest quantity of fructans, which have the potential to decrease the population of bacteria (Roberford, 2007)
An experiment was carried out to study the effect of bulb size on the seed production of two varieties of onion during the rabi season of 2018-2019
Summary
Onion (Allium cepa L.) is one of the most important bulb and major spice crop in Bangladesh. The most important character of onion is its flavor, which increase the taste of food and widely used to increases the taste of different types of food and others like gravies, soups, stew stuffing, fried fish, and meat (Rahim, 1992) It is grown in almost all the districts of Bangladesh, but mostly commercially cultivated in greater districts of Faridpur, Rajshahi, Dhaka, Mymensingh, Cumilla, Jashore, Rangpur, Kushtia, Bogra and Pabna (BBS, 2017). In Bangladesh, onion is commonly planted with the onset of winter which is short and mild in nature (Rashid, 1976) It is short day favored crop, which condition helps to seed production. Authorized inputs are very limited and a huge quantity of seed is smuggled in the country from the neighboring countries This position created some critical situation for onion cultivation in Bangladesh. The present study was conducted to investigate the effect of bulb size on seed contributing characters of two onion varieties
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