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Este trabalho teve por objetivo avaliar o crescimento de plantas jovens de nim-indiano (Azadirachta indica A. Juss.) submetidas a diferentes regimes hídricos. O delineamento experimental foi inteiramente casualizado, com sete tratamentos (100, 80, 60, 40 e 20% da capacidade de pote, suspensão de rega e reirrigado). Avaliaram-se, semanalmente, a altura, número de folhas e diâmetro do caule. Ao final do experimento, as plantas tiveram seus órgãos separados e levados à estufa para obtenção da matéria seca das folhas, caule, raízes e total e, ainda, alocação de biomassa nas folhas, caule e raízes. Também foram calculadas a área foliar, a razão de área foliar e a área foliar específica. O déficit hídrico diminuiu a altura, número de folhas e diâmetro do caule das plantas nos tratamentos mais severos. Os efeitos do estresse também foram observados na redução da matéria seca das folhas, caule, raízes e total e na alocação de biomassa para as folhas. A área foliar também apresentou reduções, mas a razão de área foliar e a área foliar específica não diferiram entre os tratamentos. As plantas reirrigadas mostraram recuperação, principalmente evidenciada pela emissão de novas folhas. Desse modo, sugere-se que para máximo crescimento o nim deve ser cultivado, na fase inicial de desenvolvimento, com 80% da capacidade de pote. This work was performed aiming to evaluate the growth of neem seedlings (Azadirachta indica A. Juss.) under water deficit. The experimental design was entirely randomized, with seven treatments (100, 80, 60, 40 and 20% of field capacity, without water and re-watering). The height, number of leaves and stem diameter were analyzed weekly. At the end of the experiment, dry matter of the leaves, shoots, roots, root to shoot ratio and biomass allocation in leaf, stem and roots were determined. Leaf area, leaf area ratio and specific leaf area were also calculated. Water stress reduced the height, number of leaves and shoot diameter in the plants of the several treatments. Water stress reduced leaf, stem and root dry matter. Only the biomass allocation to leaves was reduced. Leaf area was also reduced; however, there were not significant differences for leaf area ratio and specific leaf area. The recovery of the re-watering plants was evident by emitting new leaves. The results suggest that neem seedlings must be cultivated, in the initial phase of development, under 80% of field capacity, with maximum production

Crescimento de plantas jovens de Nim-Indiano (Azadirachta indica a. juss. - Meliaceae) sob diferentes regimes hídricos