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Response of Onion to Drought Stress at Different Growth Stages

F. Ahmed
SSO
Agronomy Division, Gazipur

M.T. Rahman
SO
Agronomy Division, Gazipur

Abstract/ Executive Summary:

A field experiment was conducted during 2010-2011 to evaluate drought stress effect on different growth stages of onion. Five treatments viz., no drought, drought at 3-leaf stage, 5-leaf stage, 7-leaf stage and 9-leaf stage were considered for the study. Drought stress showed significant influence on growth, yield contributing characters and yield. Drought stress reduced relative leaf water content, which affected growth parameters as well as yield. The higher leaf area index (LAI) and total dry matter (TDM) were observed in no drought treatment compared to drought treatments, which were reflected on bulb yield of onion. The highest bulb yield (19.33 t/ha) was obtained from no drought treatment and the lowest (12.96 t/ha) in drought stress at 5-leaf stage. Introduction

Keywords: Onion, Drought stress, Critical growth stage, Yield

Location: Joydebpur, Gazipur

Start Date: 00-00-2010

End Date: 00-00-2011

Program Area: Crop-Soil-Water Management

Commodity: Onion

Objectives:

To find out critical growth stage to drought
To evaluate the changes in physiological parameters due to drought stress.

Methodology:

The experiment was conducted at the research field of BARI, Joydebpur, Gazipur during rabi season of 2010-2011. The soil belongs to the Chhiata Series under Agro-Ecological Zone-28. Five treatments viz. no drought (well watered), drought at 3-leaf stage (25 DAT), drought at 5-leaf (30 DAT), drought at 7-leaf stage (35 DAT) and drought at 9-leaf stage (40 DAT) were used in the study. The drought was imposed for 20 days by withdrawing of irrigation. No rainfall occurred during drought imposing periods. The experiment was laid out in randomized complete block design with three replications. The unit plot size was 2.4 m x2 m. About 35 days old seedlings of onion (var. Taherpuri) were sown on December 28, 2010. Fertilizers were applied at the rate of 120-60-160-40 kg/ha NPKSMgZnB, as urea, triple super phosphate (TSP), muriate of potash (MOP) and gypsum. Half of N and K, and all other fertilizers were applied at sowing. Remaining ½ of N and K will be top-dressed at 25 and 60 DAT.Three plants per plot were sampled at different growth stages for recording growth parameters. Plants parts were separated in to leaf, stem and bulb. Leaf area was measured with an automatic area meter (LI 3100 C, LI-COR, USA). Leaves and other plant parts were dried in an oven at 80⁰C for 72 hours and dry weight was recorded.

Source of Information: Annual Report, Agronomy Division 2010-2011

Article Link (Online Journal):

Funding Source:

1. Asian Development Bank

Budget: 15,000/-

Total Budget (Tk.) : 15,000/-

Achievement/Findings:

The highest bulb yield (19.33 t/ha) was obtained from no drought treatment and the lowest (12.96 t/ha) in drought stress at 5-leaf stage. The results of the experiment revealed that 5-leaf stage is the most susceptible growth stage to drought which would reduce onion yield by 34%. The experiment should be repeated for conformation of the result.

Knowledge Management: Report/Proceedings