Two field trials were conducted during the 2005/2006 and 2006/2007 dry seasons under irrigation at the Usmanu Danfodiyo University Teaching and Research Fadama Farm at Kwalkwalawa, Sokoto (Latitude 130 1N and Longitude 50 13E, 350 m above sea level) to study the effects of potassium, nitrogen, and weeding regimes on the bulb yield of onion (Allium cepa L.). The treatments consisted of three levels of potassium (150, 200 and 250 kg/ha), three levels of nitrogen (50, 100 and 150 kg/ha) and three weeding regimes (weedy check, 4 and 6 WAT) laid out in a Randomized Complete Block Design (RCBD) with three replications. Parameters studied included bulb weight (g), bulb diameter (cm) and bulb heights (cm). The result indicated significant (P
Key words: Nitrogen, potassium, weed interference, onion, Sokoto, Rima Valley.
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