Qualidade de mudas de eucalipto produzidas sob diferentes laminas de irriga??o e dois tipos de substrato

摘要

The objective of this work was to evaluate irrigation depths in the production of Eucalyptus grandis seedlings, produced in two commercial substrates containing tree bark (CPV and CATV). The experiments took place in Camará- Mudas Florestais, in Ibaté - S?o Paulo, from winter to spring/2003, consisting of a randomized blocks design with four replicates, with 5 daily watering (6, 8, 10, 12 and 14 mm), applied several times during the day (at 10 am, 13 pm and 16 pm). At 108 days after sowing, the following parameters were assessed: height of aerial part, neck diameter, relation height of aerial part / neck diameter, number of leaf pairs, dry matter of the aerial part and roots, and leaf area. Depths of 6 and 8 mm per day reduced drastically seedling growth. The irrigation depths also influenced all the parameters of morphological characteristics. It was concluded that the water depths as high as 12 and 14 mm day-1 helped the development of the seedlings, with excellent quality at 108 days after sowing.