Qualidade de mudas de Jaracatiá submetidas a diferentes períodos de sombreamento em viveiro

Abstract

This study aimed to evaluate the influence of different periods of shade/sun in seedlings of jaracatia using quality parameters. Three assessments were performed at 100, 120, 140 days after emergence (DAE), and the treatments 60, 80, 100 DAE (evaluation 1), 60, 80, 100 and 120 DAE (evaluation 2) and 60, 80, 100, 120 and 140 DAE (evaluation 3) were shading. Jaracatia seedlings submitted to different periods under shade conditions had changes in morphological parameters and indices for quality evaluation. Seedlings that were under longer periods of shading at 100 DAE achieved greater shoot height, higher relations of shoot height/stem diameter and dry weight of shoot/dry weight of the root system. In this evaluation, plants also showed the lower diameter of root collar, dry weight of roots and Dickson quality index. Increasing the period of shading reflected negatively on the seedling root system growth at 100, 120 and 140 DAE. At 120 DAE, the quality standards considered as more suitable for planting were achieved. The best treatment was the one in which the seedlings remained for 60 days in shading followed by 60 days at full sun.