RESUMOObjetivando-se estudar o efeito das lâminas de água, doses de nitrogênio e sua interação sobre os rendimentos produtivo e econômico da cultura da alface americana irrigada por gotejamento, conduziu-se um experimento em casa- de-vegetação Termos para indexação:Lactuca sativa L., Irrigação por gotejamento, Análise econômica. ABSTRACTThe main objective of this experiment carried out from September to December/2004, under greenhouse at the Federal University of Lavras, in Minas Gerais, was to study the effect of water and nitrogen applications rates, and the interaction between these factors on both the yieldand economics of crisphead lettuce. A 4 x 4 factorial experimental design with randomized blocks and three replications was used. Treatments were determined by combinations of four water depths (W 1 =91.99; W 2 =142.79; W 3 =186.34; W 4 =237.14 mm) and four nitrogen levels (N 0 =0; N 1 =80; N 2 =160; N 3 =320 kg ha -1 ). Crisphead lettuce (cv. raider) was grown under daily irrigations applications computed based on the evaporation measured on a reduced pan (EVm). Treatments W 1, , W 2 , W 3 e W 4 , corresponded to, respectively, 0.35EVm, 0.70EVm, 1.0EVm, and 1.35EVm. A 0.30 m x 0.30 m plant spacing was observed and irrigation water was applied trough a drip irrigation system with 1.6 L h 1 emitters spaced 0.30 m apart. Under the cost scenario considered, water at R$ 0.44 mm -1 , nitrogen at R$ 2.09 kg -1 and crisphead lettuce at R$ 0.80 kg -1 , the maxim profit, and the maxim economical productivity, estimated at 26,960 kg ha ).
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