Avaliação da qualidade de mudas de cnidoscolus quercifolius pohl, clonadas pela técnica de alporquia.

Abstract

Cnidoscolus quercifolius Pohl (faveleira) is a species of the Euphorbiaceae family. The faveleira can be used for medical purposes, animal and human food, and has also been recommended for recovery of degraded areas of caatinga, since it is very resistant to drought. The layering is a propagation technique recommended for species with rooting problems, it is easy to perform, requiring no infrastructure, such as a greenhouse for production of seedlings. The rooting efficiency with the use of this technique can be improved by application of exogenous rooting inducers such as Indole Butyric Acid (IBA). Seedlings of inferior quality have been a major cause of mortality in field in the first year of implementation. The objective of this study was to evaluate the effect of different concentrations of IBA on the number of days for the appearance of roots in air layers and the influence of inducing rooting in the development of these seedlings in nursery conditions. The seedlings were produced by the process of layering and since the beginning of the experiment weekly observations were made to observe the emergence of roots to the transplanting of layers, at 90 days. Then, they were evaluated in the nursery for a period of 66 days. The results showed that most of the layers gave its first adventitious roots on the surface of the substrate, around 35 days after the beginning of the experiment. The highest concentrations of IBA provided the highest percentage of rooting in layers, reaching 90% and 80% for doses of 4.5 and 6.0 g / l of IBA, respectively. Positive linear effect was observed with increasing concentrations of IBA for the variables length of roots and main root length. The IBA had no significant effect on diameter increment (mm), but there was greater value when using 6 g / l IBA.