Ipês amarelo em fase inicial de crescimento, cultivado sob telas de sombreamento preta e colorida

Abstract

This study aimed to evaluate the initial growth of Handroanthus serratifolius(Vahl) S.O.Grose. and Handroanthus ochraceus (Cham.) Mattos. in black and colored shading net. The study was conducted at the Department of Plant Production, at UFMT - SINOP, with seedlings transplanted to pots with 8 liters of substrate. The experimental design was completely randomized in a factorial 2 x 5 (species x covers) with 16 repetitions in two experiments: the first with the treatments: Full sun and black net with 35%, 50%, 65% and 80% retention of global radiation. The second with: red, blue and green net with 50%; Aluminet silver net with 50% black net with 50% retention of global radiation. Analyses of the parameters: height, stem diameter and number of leaves and leaflets were taken every 20 days and a destructive analysis was performed at the end of the experimental period, with 7 plants of the repetitions, to obtain the dry mass of leaves, stem, root and leaf area. Data were subjected to analysis of variance, regression and Tukey test at 5% probability. H. Serratifolius. and H. ochraceus were significantly different for all parameters of growth. The conditions full sun and black 35% shading net provided the best growth responses in all parameters, while the seedlings under shade higher than 50% provide the worst averages. The use of red colored net improved the growth in both species, on the other hand the seedlings in the blue net had inhibited growth. In conclusion the intensity and quality of the overall radiation retained and transmitted have influences in the initial growth of seedlings of the species Handroanthus serratifolius and Handroanthus ochraceus.