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Effect of Different Pollinator Attractant Crops for Seed Setting and Maximizing Seed Yield of Onion

Md. Kalim Uddin,
Principal Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra

M. M. Kamal
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra

M Abdul Wadud
Scientific Officer
Spices Research Center,BARI, Shibganj, Bogra

M. S. A. Mallik
Director
Spices Research Center,BARI, Shibganj, Bogra

Abstract/ Executive Summary:

The experiment was conducted at the Spices Research Centre, Shibgonj, Bogra during rabi season, 2010-11and 2011-12 to identify the suitable pollinator attractant crops for increasing the vigilance of pollinators for higher seed settings and thereby increasing seed yield of onion.In both the years, percent seed setting was lowest in Sole onion (55.93 % in 2010-11 and 57.73% in 2011-12). Accordingly, the lowest seed yield was also recorded from Sole onion (623.3 kg/ha in 2010-11 and 685.44 kg/ha in 2011-12). The best insect pollinator observed was Horse fly for onion crops. The Honey Bee was the second best and Syrphid fly was the third best insect pollinator. The rest of all insects recorded during observation were minor pollinator. Dill and Fennel was the better attractant crop for pollination while coriander acted as intermediate.

Keywords: ATTRACTANT , ONION, POLLINATOR, SEED SETTING, YIELD.

Location: Spices Research Center,BARI, Shibganj, Bogra

Start Date: 01-11-2010

End Date: 30-04-2012

Program Area: Variety and Species

Commodity:

Objectives:

1. To identify suitable attractant crop for increasing vigilance of pollinators for higher seed yield of onion through. 2.To identifying and utilizing suitable attractant crop(s) for increasing the vigilance of pollinators.

Methodology:

The experiment was conducted at the Spices Research Centre, Shibgonj, Bogra during rabi season, 2010-11 and 2011-12. The experiment was laid out in randomized complete block design with three dispersed replications. The distance among replications varied from 500m to 600m. In 2010-11, four treatments viz., Onion + Fennel (two rows at every 10 rows of onion including border), Onion + Black cumin (two rows at every 10 rows of onion including border), Onion + Coriander (two rows at every 10 rows of onion including border) and Sole onion were compared to achieve the objectives. In 2011-12, the treatment Onion + Black cumin was discarded and onion + Dill was included along with other treatments. The unit plot size was 11.8 x 8 m2 in 2010-2011 and 7.2 x6 m2 in 2011-12. In each plot, BARI Piaz 4 was planted maintaining 20 cm x 15 cm spacing. As per treatments, the boarder crop was planted in paired rows, maintaining 30 cm x 15 cm, 30cm x15cm, 20 cm x 15 cm and 30 cm x 15 cm spacing for Fennel, Dill, Black cumin and Coriander, respectively. The crop (onion) was planted through 13-14 November 2010 and 13-15 in November 2011. To control purple blotch disease, the crop was sprayed with ‘Rovral’ @ 2g /L of water at 40, 50, 60 and 70 DAP in both the years. Similarly, to control thrips, ‘Gain’ @ 0.25 ml/L of water was sprayed at 35, 45, 55 and 65 DAP. The spray remained stopped after initiation of first blooming. Data on plant height, scape height, number of umbel per plant, diameter of umbel, number of flowers per umbel, number of flowers setting seeds per umbel, percent seed settings, 1000-seed weight, seed yield, types of pollinator and number of vigilance were recorded.

Source of Information: Spice Research Report 2011-12

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In review of the result of the study, it can be concluded that for higher seed setting and obtaining higher seed yield of onion, Pollinator attractant crop like Fennel and/or Coriander can be planted in a sequence of two rows for every alternate 10 rows of onion including border. Height of the pollinator attractant crops if possible should be nearly same as that of onion. Planting of attractant crops should be synchronize in such a way so that flowering period of the attractant crops should be at least at the same time of onion. Fennel should be planted at the time of onion planting. Coriander should be planted 20-22 days after onion planting. Dill should be planted on the day of onion planting but further study may be needed for Dill regarding its performance for onion seed settings.

Knowledge Management: Journal, Report/Proceedings