SUMMARYNickel is a micronutrient involved in nitrogen metabolism and a constituent of the urease molecule. Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots in a 2 x 8 factorial design with two nitrogen (N) sources and eight Ni rates, with five replications. Nitrogen was applied at 200 mg dm -3 (half the dose incorporated into the soil at seedling transplanting and half top-dressed later) using the sources NH 4 NO 3 (AN) and CO(NH 2 ) 2 (Ur). The Ni treatments (0, 2, 4, 8, 12, 16, 24 and 32 mg dm -3 ) were applied as NiCl 2 . The shoot dry-matter yield, leaf urease activity, Ni levels in the lettuce leaves and Ni levels extracted from soil with Mehlich-3 (M-3) and DTPA were determined. In the plants supplied with AN , the shoot dry-matter yield was higher than in those supplied with Ur. There was no difference in shoot dry matter in response to soil-applied Ni. The leaf urease activity increased with Ni application, regardless of the N source. The extractions with M-3 and DTPA were efficient to evaluate Ni availability for lettuce in the Red-Yellow Latosol. Ni (0, 2, 4, 8, 12, 16, 24
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