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Different doses of paclobutrazol (PBZ) and different bulb sizes of onion were evaluated to determine their effect on growth and seed production of onion. Onion variety 'Taherpuri' with three-bulb sizes - small, medium and large - was used. Four doses of PBZ were 0 (control), 20, 40, and 80 mg l-1. The two-factor experiment was laid out in a randomized complete block design with three replications. Application of PBZ significantly reduced the plant height, tillers per bulb, leaves per plant and length of scape. However, in other parameters such as the number of flowers, umbels per bulb, umbel diameter, 1000-seed weight and seed yield, there were no significant influences of PBZ concentrations used (p < 0.05). On the contrary, plant height, number of leaves per plant, length of scape, effective fruits per umbel, percentage of fruit set, and seed yield were positively influenced by different bulb sizes of onion. Higher values were obtained for the above-mentioned parameters from the larger-sized bulbs and values were decreased as the bulb sizes decreased. The maximum seed yield was recorded in plants grown from the large-sized mother bulb. The interaction between the PBZ doses and bulb sizes were also significant for some variables while it was not significant for others. [ABSTRACT FROM AUTHOR]

The research work was conducted with 10 rice germplasm during T. Aman (wet season), 2004, at Bangladesh Rice Research Institute, Gazipur, to assess the different lodging concerned parameters and their interrelationships. A great extent of diversity among aromatic rice genotypes was observed in respect to canopy architecture and lodging related characters. Minimum seedling height was 30 cm for BR39 and the maximum was 47 cm for Hatisail. Variations were found in the cultivars regarding penultimate and flag leaf angles and dimensions of both the leaves. Maximum plant height was recorded to be 153 cm in Baoi jhak and the minimum was 100 cm in BR28. The longest panicle was observed in Nizersail (27 cm) and shortest in Hatisail (21 cm). The range of culm diameter was 4.0-4.7 mm and culm thickness was 0.40-0.51 mm. Rice cultivars varied for bending moment from 812 g · cm (BR28) to 2263 g · cm (Doiar guro). Lodging index was at a minimum 2.7 in BR28 and a maximum 11.28 in Sugandha-1. Plant height exhibited positive correlation with panicle exertion and internode lengths, and hence lodging index. Lodging index was found to have a negative relationship with breaking strength. In path analysis, bending moment projected highest positive direct effect on lodging index. [ABSTRACT FROM AUTHOR]