Thirteenth Issue

Effect of Irrigation scheduling on onion yield and spread of diseases

Faisal A. Ahmed, Mustafa H. Abdul Sattar, Ahmed H. Salem
Summary

This study was conducted on farmer's field in samma village south of Abyan Delta during the period 1998-1999 to investigate the effect of different irrigation treatments (35, 50 and 65% depletion of available soil moisture) on yield and quality of onion CV. "Bafuteim". A total of 17, we and 9 irrigations were applied for the first, second and third treatment respectively. Highest yield (19 ton/ha) was obtained in treatment (B) and differed significantly at P J 0.05 level with other treatments, followed by treatment (A) (17 ton/ha). There was variation in disease incidence caused by black mould in the treatments. Results revealed negative correlation between disease incidence and onion bulb moisture (r= 0.99) that found significant at P J 0.05. There was a positive correlation between disease incidence due to soft rot and moisture content in onion bulbs (r = 0.90) that differed significantly between treatments.

Key Words :Onion, Irrigation, Diseases, Yemen.

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