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Bulb Yield and Splitting Percentage of Onion as Influenced by Different Management Practices

F. Ahmed
SSO
Joydebpur, Gazipur

M.Z. Ali
SSO
Joydebpur, Gazipur

Abstract/ Executive Summary:

An experiment on different management practices on the bulb yield and quality of onion was conducted during the rabi season of 2010-11 and 2011-12. Eight management practices T₁ = No root & shoot trimming + shallow planting (approx. 1") + 20 cm x 10 cm, T₂ = No root & shoot trimming + shallow planting (approx. 1") + 10 cm x 10 cm, T₃ = No root & shoot trimming + Deep planting (approx. 2") + 20 cm x 10 cm, T₄ = No root & shoot trimming + Deep planting (approx. 2") + 10cm x 10 cm, T₅ = Root & shoot trimming + shallow planting (approx. 1") + 20cm x 10cm, T₆ = Root & shoot trimming + shallow planting (approx. 1") + 10 cm x 10 cm, T₇ = Root & shoot trimming + Deep planting (approx. 2") + 20 cm x 10 cm, T₈ = Root & shoot trimming + Deep planting (approx. 2") + 10cm x 10 cm were evaluated in the present study. Bulb yield increased with closer spacing. Over the years, the highest bulb yield (22.53 t/ha and 24.69 t/ha) was recorded in T₂ treatment and the lowest bulb yield (12.87 t/ha and 16.50) was recorded in T₇ treatment. However, management practices showed remarkable influence on bulb size as well as split bulb percentage. The highest split bulb percentage (38%) was observed in T₁ treatment while the lowest (18%) in T₈ treatment. Root and shoot trimming along with deep planting with 10 cm x 10 cm spacing would increase yield with less percentage of split bulb.

Keywords: Bulb yield, Spliting percentage,Onion ,Management practices

Location: Joydebpur, Gazipur

Start Date: 22-12-2011

End Date: 03-04-2012

Program Area: Crop-Soil-Water Management

Commodity: Onion

Objectives:

To find out suitable management practices for quality bulb production in onion.

Methodology:

The experiment was conducted on different management practices for quality bulb production in onion at the research field of Agronomy Division, BARI, Joydebpur, Gazipur during rabi season of 2011-12. Eight management practices viz. T₁ = No root & shoot trimming + shallow planting (approx. 1") + 20 cm x 10 cm T₂ = No root & shoot trimming + shallow planting (approx. 1") + 10 cm x 10 cm T₃ = No root & shoot trimming + Deep planting (approx. 2") + 20 cm x 10 cm T₄ = No root & shoot trimming + Deep planting (approx. 2") + 10cm x 10 cm T₅ = Root & shoot trimming + shallow planting (approx. 1") + 20cm x 10cm T₆ = Root & shoot trimming + shallow planting (approx. 1") + 10cm x 10cm T₇ = Root & shoot trimming + Deep planting (approx. 2") + 20cm x 10 cm T₈ = Root & shoot trimming + Deep planting (approx. 2") + 10cm x 10 cm were used as treatments in the present study. The experiment was laid out in RCB design with three replications. The unit plot size was 2 m x 3 m. About 35 days old seedlings of onion (var. Thaherpuril) were sown on December 22, 2011. Before sowing root and shoot were trimmed according to treatments. Fertilizers were applied at the rate of 120-60-160-40 kg/ha NPKS as urea, triple super phosphate (TSP), muriate of potash (MOP) and gypsum. Half of N and K, and all other fertilizers were applied at planting. Remaining ½ of N and K was top-dressed at 25 and 50 DAT. Crop was harvested on 3^rdApril 2012.

Source of Information: Annual Report, Agronomy Division, Gazipur 2011-12, BARI

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank

Budget: 20,000/-

Total Budget (Tk.) : 20,000/-

Achievement/Findings:

Over the years, the highest bulb yield (22.53 t/ha and 24.69 t/ha) was recorded in T₂ treatment and the lowest bulb yield (12.87 t/ha and 16.50) was recorded in T₇ treatment. However, management practices showed remarkable influence on bulb size as well as split bulb percentage. The highest split bulb percentage (38%) was observed in T₁ treatment while the lowest (18%) in T₈ treatment. Results revealed that, wider spacing produced larger bulb with reduce bulb yield compared to closer spacing. However, root and shoot trimming along with deep planting and closer spacing gave higher yield with less percentage of split bulbs which are desirable.

Knowledge Management: Report/Proceedings