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Performance of Summer Onion Stored Bulbs on Seed Production as Affected by Pre-harvest Shoot Bending and Curing Methods

Ferdouse Islam
Olericulture Division, Horticulture Research Centre, Bangladesh Agriculture Research Institute, Joydebpur, Gazipur

M.A. Rahim
Department of Horticulture, Bangladesh Agricultural University, Mymensingh-2202

Abstract/ Executive Summary:

The experiment was carried out at Horticulture Farm, Bangladesh Agricultural University (BAU), Mymensingh in robi seasons during kharif season of 2008 to see the seed production ability of stored bulbs where pre-harvest shoot bending and without bending were done and harvested bulbs attached with leaves and without leaves. were cured under shade and sun. The two factors experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. After storage, onion bulbs were planted on 3 November, 2008 for seed production. From combined effects, it was observed that the highest percentage of emergence of sets was observed from pre-harvest shoot bending bulbs which was cured under shade with leaves and the lowest percentage of emergence of sets was observed when bulbs did not receive pre-harvest shoot bending practice and cured under sun without leaves. Combinedly, the highest thousand seed weight, seed yield per hectare and the highest percentage of germination were found while pre-harvest shoot bending bulbs were cured under shade with leaves and the lowest percentage of seed yield and germination percentage was found when pre-harvest without shoot bending bulbs were cured under sun without leaves.

Keywords: Summer onion, Bulb, Seed production, Pre-harvest, Shoot bending, Curing

Location: Horticulture Farm, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 13-03-2008

End Date: 25-05-2008

Program Area: Seed Technology

Commodity: Onion

Objectives:

1. To see the seed production ability of stored bulbs where pre-harvest shoot bending and without bending were done and harvested bulbs attached with leaves and without leaves. were cured under shade and sun.

Methodology:

The experiment was carried out at Horticulture Farm, Bangladesh Agricultural University (BAU), Mymensingh in Kharif season during 2008. The soil of the experimental area was sandy loam and belongs to the Old Brahmaputra Floodplain under Agro ecological Zone 9 having non-calcareous dark-grey soils. The experimental area is situated under the subtropical humid climate. The two factors experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The size of each unit plot was 2.0m × 1.0m. Thirty five days old seedlings raised in seed beds were transplanted in the unit plots on 13 March, 2008 at a spacing of 20cm × 10cm. The seed of BARI Peaz-2 was used as planting material. The land was fertilized at recommended dose of SRC (Spices Research Center) CD-urea-TSP-MoP-ZnO-gypsum @ 5t/ha-200-175-150-3-110 kg/ha were followed. Total quantity of CD, TSP, MoP, gypsum, ZnO and half of urea were applied during final land preparation. The rest of urea was applied as top dress in two equal installment at 21 and 45 days after transplanting. Other crop production and protection measure were taken as and when necessary. Harvesting was done on 25 May, 2008. As pre-harvest factors shoot bending and without bending method and as post-harvest factors four types of curing methods were considered as treatment for the experiment. Shoot bending was done manually on standing crops at 7 days before harvest as per treatment. Four types of curing method were followed after harvest. Bulbs cured for 5 days under shade with top and without top and bulbs cured for 5 days under sun with top and without top. After curing, randomly selected 20 bulbs were placed on 2 June, 2008 for storage and stored up to 2 October, 2008 (105 days) at room temperature (25±2⁰C) as per treatments in thatched house on bamboo mat. The stored bulbs were checked at 15 days intervals. During storage, inside the thatched house an average temperature was maximum 32^oC and minimum 15^oC recorded in the months of June to November. Following data were recorded during storage performance of onion bulb for seed production, i,e. percent of weight loss of bulb, percentage of loose scale bulbs, percentage of rotten bulb, percentage of sprouted bulbs, percentage of marketable bulb. After storage, onion bulbs were planted on 3 November, 2008 at 15cm x 20cm spacing. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The unit plot size was 2.0 m × 1.0 m. Crop was fertilized with CD-urea-TSP-MoP-gypsum-ZnO-boron @ 10 ton/ha-200-175-150-110-3-2 hg/ha. Seeds were collected on 18-26 March, 2009. Mature umbels were harvested at different dates when 15-20% of the fruits had black seed exposed. Umbels were harvested with a small portion of flowering stalk in the morning to prevent shattering of seeds. In general data were collected at various stages of plant growth and development during harvest and post harvest handling of seed i.e emergence of bulb, plant height (cm), number of leaves per plant, number of tillers per plant, length of stalk (cm), number of umbels per plant, number of flowers per umbel , number of seeded fruits per umbel, seed weight per umbel (g), seed yield per plant (g), seed yield per plot (kg), seed yield per hectare (kg), percent of seed germination. Data on seed quality i.e thousand seed weight and seed germination percentage were recorded. The collected data on various parameters were statistically analyzed using the program MSTAT to find out the significance of the treatment effects.

Source of Information: J. Agrofor. Environ. 8 (2): 171-175, 2014; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Pre-harvest shoot bending and curing method had marked influence on quality seed production of summer onion. From combined effects, it was observed that the highest percentage of emergence of sets was observed from pre-harvest shoot bending bulbs which was cured under shade with leaves and the lowest percentage of emergence of sets was observed when bulbs did not receive pre-harvest shoot bending practice and bulbs cured under sun without leaves. Combinedly, the highest thousand seed weight, seed yield per hectare and the highest percentage of germination were found while pre-harvest shoot bending bulbs were cured under shade with leaves and the lowest percentage of seed yield and germination percentage was found while pre-harvest without shoot bending bulbs were cured under sun without leaves

Knowledge Management: Journal