The adequate supply of nitrogen is essential for the plant metabolism. This nutrient has an irreplaceable role on the vegetative and reproductive growth of physic nut; therefore the correct management of the fertilization is very important, particularly in tropical regions, which present considerable losses of nitrogen by leaching and volatilization processes. This study was made with the objective of evaluating the growth of genotypes of physic nut conditioned by nitrogen fertilization. The experiment was conducted in controlled environment, following a factorial scheme 12 × 4, with 12 Brazilian genotypes of Jatropha curcas L. and 4 levels of nitrogen fertilization (0%, 50%, 100% and 150% of the recommendation), in completely randomized design, with four replications. The growth of the genotypes was evaluated at 100 days of cultivation. Positive response to the increase in the nitrogen supply was observed in most genotypes, with gain in plant height, stem diameter, number of leaves, leaf area and root volume. The levels of nitrogen fertilization promoted differential growth between genotypes, being possible to identify genotypes with superior growth for each level.
 Silva, M.B.R., Dantas Neto, J., Fernandes, P.D. and Farias, M.S.S. (2009) Cultivation of Physic Nut under Salinity and Hydric Stress Conditions in a Controlled Envoroment. Revista de Biologia e Ciências da Terra, 9, 74-79. [in Portuguese]
 Drumond, M.A., Santos, C.A.F., Oliveira, V.R., Martins, J.C., Anjos, J.B. and Evangelista, M.R.V. (2010) Agronomic Performance of Different Genotypes of Physic Nut in the Semi-Arid Zone of Pernambuco State. Ciência Rural, 40, 44-47. [in Portuguese]
 Amaral, J.F.T., Martins, L.D., Laviola, B.G., Christo, L.F., Tomaz, M.A. and Rodrigues, W.N. (2012) A Differential Response of Physic Nut Genotypes Regarding Phosphorus Absorption and Utilization Is Evidenced by a Comprehensive Nutrition Efficiency Analysis. Journal of Agricultural Science, 4, 164-173.
 Durães, F.O.M., Laviola, B.G., Sundfeld, E., Mendon ç a, S. and Bhering, L.L. (2009) Research, Development and Inovation in Physic Nut for the Biofuel Production. Embrapa Agroenergia, Brasília. [in Portuguese]
 Laviola, B.G., Rosado, T.B., Bhering, L.L., Kobayashi, A.K. and Resende, M.D.V. (2010) Genetic Parameters and Variability in Physic Nut Accessions during Early Developmental Stages. Pesquisa Agropecuária Brasileira, 45, 1117-1123.
 Laviola, B.G., Bhering, L.L., Mendonça, S., Rosado, T.B. and Albrecht, J.C. (2011) Morpho-Agronomic Characterization of the Germplasm Bank of Jatropha Young Stage. Bioscience Journal, 27, 371-379. [in Portuguese]
 Laviola, B.G., Alves, A.A., Gurgel, F.L., Rosado, T.B., Costa, R.D. and Rocha, R.B. (2012) Estimate of Genetic Parameters and Predicted Gains with Early Selection of Physic Nut Families. Ciência e Agrotecnologia, 36, 163-170.
 Christo, L.F., Amaral, J.F.T., Laviola, B.G., Martins, L.D. and Amaral, C.F. (2012) Biometric Analysis of Seeds of Genotypes of Physic Nut (Jatrophacurcas L.). Agropecuária Científica no Semi-árido, 8, 1-6.
 Martins, L.D., Lopes, J.C., Laviola, B.G., Colodetti, T.V. and Rodrigues, W.N. (2013) Selection of Genotypes of Jatrophacurcas L. for Aluminium Tolerance Using the Solution-Paper Method. Idesia, 31, 81-86.
 Laviola, B.G. and Dias, L.A.S. (2008) Nutrient Concentration in Jatropha curcas L. Leaves and Fruits and Estimated Extraction at Harvest. Revista Brasileira de Ciência do Solo, 32, 1969-1975.
 Yong, J.W.H., Ng, Y.F. and Tan, S.N. (2010) Effect of Fertilizer Application on Photosynthesis and Oil Yield of Jatropha curcas L. Photosynthetica, 48, 208-214.
 Batista, K., Giacomini, A.A., Gerdes, L., Mattos, W.T., Colozza, M.T. and Otsuk, I.P. (2014) Influence of Nitrogen on the Production Characteristics of Ruzi Grass. African Journal of Agricultural Research, 9, 533-538.
 Souza, K.S., Oliveira, F.A., Guedes Filho, D.H. and Brito Neto, J.F. (2009) Evaluation of the Components of Production of the Ricinus According of Rates of Calcareous and Phosphorus. Revista Caatinga, 22, 116-122. [in Portuguese]
 Collier, L.S., Castro, D.V., Dias Neto, J.J., Brito, D.R. and Ribeiro, P.A.A. (2006) Nitrogen Fertilization Management for Maize on Legume Straw Crop with No Tillage Cultivation in Gurupi, Tocantins State. Ciência Rural, 36, 1100-1105.
 Silva, E.C., Muraoka, T., Buzetti, S. and Trivelin, P.C.O. (2006) Nitrogen Management in Corn under No-Tillage with Different Cover Crops in a Rhodic Hapludox Soil. Pesquisa Agropecuária Brasileira, 41, 477-486. [in Portuguese]
 Lara Cabezas, W.A.R. and Souza, M.A. (2008) Ammonia Volatilization, Leaching of Nitrogen and Corn Yield in Response to the Application of Mix of Urea and Ammonium Sulphate or Gypsum. Revista Brasileira de Ciência do Solo, 32, 2331-2342. [in Portuguese]
 Novais, R.F., Neves, J.C.L. and Barros, N.F. (1991) Experiments in Controlled Environment. In: Oliveira, A.J., Garrido, W.E., Araújo, J.D. and Lourenço, S., Eds., Methods of Research of Soil Fertility, Embrapa/SAE, Brasília, 189-254. [in Portuguese]
 Mengel, K. and Kirkby, E.A. (2001) Principles of Plant Nutrition. Kluwer Academic Publishers, Dordrecht.
 Carelli, M.L.C., Ungaro, M.R.G., Fahl, J.I. and Novo, M.C.S.S. (1996) Nitrogen Levels, Metabolism, Growth and Yield of Sunflower. Revista Brasileira de Fisiologia Vegetal, 8, 123-130. [in Portuguese]
 Freiberger, M.B. (2012) Initial Growth of Physic Nut in Function of the Fertilization NPK. Dissertation (Master Degree), Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, Botucatu. [in Portuguese]
 Maffeis, A.R., Silveira, R.L.V.A. and Brito, J.O. (2000) Macronutrients and Boron Deficiencies Reflexes on Plant Growth, Production and Essential Oil in Eucalyptus citriodora. Scientia Forestalis, 57, 87-98. [in Portuguese]
 Seemann, J.R., Shaiey, T.D., Wang, J.L. and Osmond, C.B. (1987) Environmental Effects on Photosynthesis, Nitrogen Use Efficiency, and Metabolic Pools in Leaves of Sun and Shade Plants. Plant Physiology, 84, 796-802.
 Evans, J.R. (1983) Nitrogen and Photosynthesis in the Flag Leaf of Wheat (Triticum aestivum L.). Plant Physiology, 72, 297-302.
 Evans, J.R. and Seemann, J.R. (1984) Differences between Wheat Genotypes in Specific Activity of Ribulose-1,5-bisphosphate Carboxylase and the Relationship to Photosynthesis. Plant Physiology, 74, 759-765.
 Sinclair, T.R. and Horie, T. (1989) Leaf Nitrogen, Photosynthesis, and Crop Use Efficiency: A Review. Crop Science, 29, 90-97.
 Fahl, J.I., Carelli, M.L.C., Vega, J. and Magalhães, A.C. (1994) Nitrogen and Irradiance Levels Affecting Net Photosynthesis and Growth of Young Coffee Plants (Coffea arabica L.). Journal of Horticultural Science, 69, 161-169.