VOL. 13, NUM. 09 www.scientiaplena.org.br
2017 doi: 10.14808/sci.plena.2017.091201
Initial growth and photosynthetic characteristics of Hymenaea courbaril plants submitted to different concentrations of potassium Crescimento inicial e características fotossintéticas de plantas de Hymenaea courbaril submetidas a diferentes concentrações de potássio
N. C. de Melo1; A. M. C. Mendonça2*; C. L. Rodas3; S. F. Ribeiro2; V. F. C. Monteiro2; J. P. R. A. D. Barbosa2 1
Instituto Federal de Educação Ciência e Tecnologia do Pará, Avenida Almirante Barroso, nº 1155, Bairro Marco, CEP 66093-020, Belém- PA, Brasil
2
Universidade Federal de Lavras, Departamento de Biologia, Setor de Fisiologia Vegetal, Campus Universitário, CEP 37200-000, Lavras-MG, Brasil. Caixa Postal 3037 3
Universidade Federal de Lavras, Departamento de Ciências do Solo, Campus Universitário, CEP 37200-000, Lavras-MG, Brasil. Caixa Postal 3037
*
[email protected] (Recebido em 28 de julho de 2017; aceito em 26 de setembro de 2017) __________________________________________________________________________________________________________
The degradation of Cerrado biome has been increasing the demand for high quality tree seedlings, so that it is necessary to understand the nutritional requirements of these plants. Hymenaea courbaril L., known as jatobá, has a wide distribution that makes it an alternative of reforestation of degraded areas. The aim of the experiment was to evaluate H. courbaril initial growth and gas exchange characteristics under different potassium concentrations (K+). The experiment was arranged in a completely randomized design with five treatments (T0- 0, T1- 3, T2- 6, T3-9 e T4- 12 mM of K+) and four repetitions. Growth measurements were carried out every 15 days. SPAD index and gas exchange measurements were evaluated at 0, 30, and 60 days after treatment imposition. At the end of the experimental period, dry matter was evaluated, and root: shoot ratio (R:S) and Dickson quality index (DQI) were calculated The data were subjected to a one-way ANOVA and by Tukey’s test (P
