DETERMINAÇÃO DO CRESCIMENTO E VIGOR DE MUDAS DE JATOBÁ (Hymenaea courbaril L.) CULTIVADAS EM SISTEMA HIDROPÔNICO, ATRAVÉS DE ATRIBUTOS FISIOLÓGICOS MORFOANATÔMICOS E NUTRICIONAIS

Abstract

The native fruit jatobá (Hymenaea courbaril L.) is a promising species for forest production, as it has excellent wood properties. Actually, little is known about nutritional requirements and physiological responses due to the lack of scientific studies. The present study aimed to evaluate the physiological responses of neotropical fruit Hymenaea courbaril (leguminosae: Caesalpinioideae) associated with a hydroponic growth curve, in a greenhouse. In the second study, the objective was to evaluate the nutritional growth and morphoanatomy of Hymenaea courbaril L. grown in a hydroponic system. The greenhouse experiment was carried out at the Goiano Instituto Federal in the Rio Verde municipality, where jatobá plants were grown in nutrient solution, each plot consisting of an eight liter pot of nutrient solution with two plants. From 30 days after transplantation (DAT), growth and physiological assessments were performed every 30 days. The treatments consisted of six evaluation periods at (30; 60; 90; 120; 150; and 180 DAT). To obtain growth and nutritional absorption, the jatobá seedlings were grown in nutrient solution for a period of 180 days. Evaluations of phenotypic growth characteristics (stem diameter, leaves number, nodes number, root length, stem length and leaf area), physiological analyzes (gas exchange and fluorescence) and morphoanatomical analyzes at the end of the experiment were carried out, as well as plant dry mass measurement and nutrients quantification. The macro and micronutrient contents followed the following order in Jatobá seedlings: N> Ca> K> P> Mg> S and Fe> Mn> B> Zn> Cu. After 120 days, a maintenance in the linear growth patterns of the jatobá plants was observed, although a drop was observed in the parameters of gas exchange, fluorescence and pigments.