RESUMOCom o objetivo de se avaliar o efeito de diferentes tipos e espaçamentos de gotejadores usados no cultivo de melão sob duas densidades de plantio, desenvolveu-se um experimento na Fazenda São João, Município de Mossoró, RN, durante o período de setembro a novembro de 1998. O delineamento experimental utilizado foi o de blocos casualizados completos, em parcelas subdivididas, com três repetições. Nas parcelas experimentais foram instaladas as diferentes linhas de gotejadores (Katif 2,3 L h -1 a 0,40 e 0,60 m; Katif 3,75 L h -1 a 0,60 e 0,80 m; Hydrodrip II 2,3 L h -1 a 0,30 e 0,50 m; Netafim ST-125 1,65 L h -1 a 0,50 m; Chapin 15 Mil 1,12 L h -1 a 0,30 m e Queen gil 1,42 L h -1 a 0,30 m) e, nas subparcelas, as populações de 15.000 e 20.000 plantas ha -1 . Os resultados mostraram que o uso de gotejadores de menor espaçamento ou maior vazão com a maior densidade de plantio, proporcionou maior porcentagem do stand de plantas de melão. Maiores rendimentos de melão foram obtidos quando se utilizaram as linhas de gotejadores Queen gil 1,42 L h -1 a 0,30 m e Hydrodrip II 2,3 L h -1 a 0,30 m, embora diferindo estatisticamente apenas da Chapin 15 Mil 1,12 L h -1 a 0,30 m.Palavras-chave: irrigação por gotejamento, manejo de água, Cucumis melo L. ABSTRACTTo evaluate the effect of different kinds and dripper spacings used in the melon cultivation, under two plant densities, a study was conducted at 'São João' farm, in the municipal district of Mossoró, RN, during the period of September to November, 1998. The experimental design was a completely randomized block in a split-plot layout, with three replications. The different dripper lines were installed in main plots (Katif 2.3 L h -1 at 0.40 and 0.60 m; Katif 3.75 L h -1 at 0.60 and 0.80 m; Hydrodrip II 2.3 L h -1 at 0.30 and 0.50 m; Netafim ST -125 1.65 L h -1 at 0.50 m; Chapin 15 Mil 1.12 L h -1 at 0.30 m and Queen gil 1.42 L h -1 at 0.30 m) and, in subplots, the populations of 15,000 and 20,000 plants ha -1 . The results showed that the stand percentage was higher in the dripper of smaller spacing and discharge and for higher plant density. The dripper lines Queen gil 1.42 L h -1 at 0.30 m and Hydrodrip II 2.3 L h -1 at 0.30 m presented higher melon yield although statistically differing only to Chapin 15 Mil 1.12 L h -1 at 0.30 m.
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