Crescimento da elodea (Egeria densa) submetida a diferentes fotoperíodos

Abstract

Egeria densa is a perennial aquatic macrophyte, the Hydrocharitaceae family, often used in Aquarium. It is generally found in beginner aquariums for its easy adaptation to different environments. The photoperiod is an abiotic variable which influence directly in the primary production of aquatic macrophytes determining their growth and productivity. Therefore, this study aimed to analyze the growth performance of E. densa submitted to different photoperiods. For this, it was used 108 samples of E. densa distributed in 18 experimental units, of 6 samples in each experimental unit. The specimens of each unit sample were standardized in 7 cm and was made measurement of apical parts to the base of the stem. In the experiment has been tested three treatments, T1 with a photoperiod of 8 hours, T2 and T3 with 12 hours with 16 hours with 6 replicates, the experimental design was entirely randomized. The illumination was carried out with the aid of two T8 32W lamps with luminous flux of 2700 lumens that were 10 cm of water slide depth. The experiment lasted for 35 days, after this trial period the samples have last biometrics. The results were submitted to the analysis of variance test (ANOVA) and compared with Tukey test. Treatments 2 and 3 had the best performance in length of branches and fresh weight compared to treatment 1. Was found with experiment that cultivation of plants under these conditions does not influence us water measured parameters. According to of results of this work, treatments two and three had the best performance in length of branches and fresh pasta during the 35 days of treatment. Thus the photoperiod of 12 hours results in a similar growth 16 hours of treatment, but with shorter time of light, thus reducing the consumption of electricity.