________________________________________________________________________________ ResumoO objetivo do presente trabalho foi definir a dose de N em cobertura necessária para o maior desenvolvimento da cultura da alface crespa, cultivar Vanda. Realizou-se cinco tratamentos, doses de N aplicados em cobertura (0, 30, 60, 90 e 120 kg ha -1 ), e quatro repetições, fornecidas em doses iguais aos 10, 20, 30 dias após o transplante (DAT). A colheita foi realizada aos 60 DAT onde avaliaram-se: número de folhas, altura da planta, largura da folha, comprimento da folha, largura da planta, diâmetro do caule e produtividade total. A dose de 98,5 kg ha -1 de N na adubação de cobertura proporcionou melhor desenvolvimento na cultura da alface cultivada a campo. Palavras-chaves: Lactuca sativa L., nitrogênio, nutrição de plantas AbstractThe objective of the present work was to define the dose of N in the necessary cover to the greater development of the cultivated Vanda cultivar. Five treatments, doses of N applied in a cover (0, 30, 60, 90 and 120 kg ha -1 ) and four replicates, were given in equal doses at 10, 20, 30 days after transplantation (DAT). Harvest was carried out at 60 DAT where they evaluated: leaf number, plant height, leaf width, leaf length, plant width, stem diameter and total productivity. The 98.5 kg ha -1 dose of N in cover fertilization provided a better development in field cultivated lettuce.
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