Estabelecimento de Mudas de Eucalyptus spp. e Corymbia citriodora em Diferentes Substratos

Abstract

RESUMOO presente trabalho objetivou avaliar a qualidade de mudas de seis espécies de eucalipto, produzidas em substratos com diferentes proporções dos resíduos orgânicos: fibra de coco e casca de arroz carbonizada. O experimento foi implantado no Viveiro Florestal da UnB. Como substratos, foram utilizados os dois resíduos misturados à vermiculita em três proporções (25%, 50% e 75%). As espécies foram avaliadas separadamente, cada uma com seis tratamentos dispostos em DIC no esquema fatorial 2×3 (dois resíduos e três proporções), com oito repetições. Foram avaliados: altura, diâmetro, número de folhas, massa seca aérea e radicial, relação altura/ diâmetro e índice de qualidade de Dickson. O resíduo fibra de coco foi superior em relação à casca de arroz carbonizada para altura, diâmetro, massa seca aérea e relação altura/diâmetro para a maioria das espécies avaliadas. A incorporação de 25% da fibra de coco proporcionou um maior padrão de qualidade das mudas em todas as espécies estudadas.Palavras-chave: resíduos orgânicos, fibra de coco, casca de arroz carbonizada. Establishment of Seedlings of Eucalyptus spp. andCorymbia citriodora on Different Substrates ABSTRACTThis study aimed to evaluate the quality of seedlings of six eucalypt species produced on substrates with different proportions of organic waste: coconut fiber and rice hulls. The experiment was carried out in the forest nursery of the University of Brasilia (UnB). The substrates used comprised combinations of two residues mixed with vermiculite at three proportions (25%, 50% and 75%). The species were evaluated separately, each with 6 treatments arranged in a completely randomized design in a 2x3 factorial (two residues and three proportions) with 8 repetitions. The following parameters were evaluated: height, diameter, number of leaves, dry mass of shoots and roots, height/diameter ratio, and Dickson quality index. Higher measures of height, diameter, dry mass of shoots, and height/diameter ratio were observed on the substrate with coconut fiber compared with the substrate with rice hulls for most species evaluated. The incorporation of 25% of vermiculite to coconut fiber residue provided a higher quality standard of seedlings for all species studied.

Germination of Corymbia citriodora on different substracts

“…In the germination speed, substrate + coconut fiber (2: 1) also stood out, which can be considered low-cost mixture. The same was observed by Oliveira et al (2014), where a lower proportion of coconut fiber also stood out in the production of C. citriodora seedlings. Following the same reasoning, Ferreira et al (2020) highlight that the alternative substrate for seedling production, composed of coconut fiber and vermicompost, was the most promising.…”

Does the quality of Luehea divaricata seedlings in the nursery correspond to their behavior in the field?

“…The Dickson quality index (DQI) confirmed the results obtained for most of the variables evaluated, thus indicating that the DQI reduces with the increase in the percentage of CRH in the substrate composition. Similar behavior was observed by Oliveira et al (2014) when testing different substrates for seedling production of Eucalyptus spp. and Corymbia citriodora, with the substrate composed of 75% CRH, which presented the least significant results for this variable in comparison with 25 and 50% mixture of CRH.…”

Production of Eucalyptus urograndis plants cultivated with activated biochar

“…The values of height and total dry biomass (TDB) were higher than those found by Oliveira et al (2014), who 14/6 evaluated substrates containing 50% carbonized rice husk and 50% vermiculite thin and found 11.69 cm height and 0.304g TDB for Eucalyptus grandis X Eucalyptus urophylla. Our values were lower than those found by Melo et al, (2014), who worked with farmyard manure with carbonized rice husks for E. grandis and by Batista et al (2014), who evaluated solid residue urban composite for E. urophylla.…”