Onion production is limited by environmental factors, especially in arid and semi-arid regions. A two-year study was carried out to investigate the response of onion (Allium cepa L.) cv. Bawku Red to the application of farmyard manure (FYM), inorganic fertilizer (IF) or a combination of manure and inorganic fertilizer (FYM+IF) when irrigation is withheld just before breakover or at 50% breakover. Onion plant height, foliage weight, bulb diameter and bulb weight were increased by FYM+IF in both years. Onion bulb yield due to the FYM+IF treatment was 34.1% higher than that for FYM, and 4.6% higher than that for the IF treatment. The highest number of split bulbs, which are not marketable but are used by producers under our economic conditions, was recorded L. Abbey is affiliated with Cranfield University,

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