Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2011.118.122CavalcanteI.H.L. Da SilvaR.R.S. AlbanoF.G. De LimaF.N. S. MarquesA. De 42011104The objective of this research was to study the effect of humic substances on seedling production of papaya cv. Formosa. A completed randomized blocks design with five treatments (humic acid doses) was adopted, with five repetitions of 10 seedlings each, with a total of 250 seedlings. The following humic substances doses studied were 0 (unsprayed), 7.5, 15, 22.5 and 30 mL m2 (0, 0.40, 0.80, 1.19 and 1.59 mL seedling-1), were sprayed at 15, 25 and 35 days after sowing. At the end of the experiment (45 days after sowing) the following variables were recorded: (1) plant height; (2) stem diameter; (3) dry weight of shoots and roots; (4) root length; (5) root volume and (6) Leaf Chlorophyll. Thus, our studies demonstrate that: (1) humic substances sprayed positively affect aerial part and root system of papaya seedlings and (2) seedling quality of papaya are improved by humic acids foliar spray although further studies are need to obtain a dose recommendation.]]>Asik, B.B., M.A. Turan, H. Celik and A.V. Katkat,2009Triticum durum cv. Salihli) under conditions of salinity.]]>18795Celik, H., A.V. Katkat, B.B. Asik and M.A. Turan,2010422938Chen, Y., C.E. Clapp and H. Magen,20045010891095De Smet, I., S. Vanneste, D. Inze and T. Beeckman,200660871887El-Hendawy, S.E., Y. Hu and U. Schmidhalter,200556123134Eyheraguibel, B., J. Silvestre and P. Morard,20089942064212Ferrara, G. and G. Brunetti,2008Vitis vinifera L. cv Italia.]]>427987Ferrara, G. and G. Brunetti,2010Vitis vinifera L.) cv Italia.]]>8817822Kaya, M., M. Atak, K. Mahmood, C.Y. Cefci and S. Ozcan,2005Phaseolus vulgaris L.).]]>7875878Kousaku, K., L.S. Wamocho, M. Utamura, I. Matsushita and T. Ishii,2006Arbuscular mycorrhizal fungi and on mycorrhizal development and growth of papaya and passionfruit.]]>9813401344Morales-Payan, J.P. and W.M. Stall,20031162830Morales-Payan, J.P. and W.M. Stall,2003Carica papaya) response to foliar treatments whit organic complexes of peptides and amino acids.]]>1163032Nardi, S., D. Pizzeghello, A. Muscolo and A. Vianello,20023415271536Nardi, S., M. Tosoni, D. Pizzeghello, M.R. Provenzano and A. Cilenti et al.,20056920122019Palmer-Rannie, I., P.M. de Gomez and J.P. Morales-Payan,200226554554Tahir, M.M., M. Khurshid, M.Z. Khan, M.K. Abbasi and M.H. Kazmi,201121124131Trevisan, S., D. Pizzeghello, B. Ruperti, O. Francioso and A. Sassi et al.,2010Arabidopsis.]]>12604614Araujo, J.R.G., M.M. Araujo Junior, R.H.N. de Menezes, M.R. Martins, R.N.S. de Lemos and M.C.M. Cerqueira,200628526529Basso, S.M.S.,1999Adesmia DC. E. Lotus L.]]>1999Costa, E., P.A.M. Leal, L.C.R. dos Santos and L.C.R. Vieira,201032463470Costa, E., P.A.M. Leal, L.C.R. dos Santos and L.C.R. Vieira,200929528537FAO,20112011Medeiros, E.V., R.A. de Carvalho Neto, V. Mendonca, D.D. de Jesus, J.K.H. Melo and F.A.R. de Araujo,2009255562