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.
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