Qualidade de mudas de eucalipto e acácia em substratos de resíduos agroindustriais
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2016-03-14
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Universidade Federal de Goiás
Resumo
Demand for quality seedlings of forest species is becoming increasingly
widespread, due to increased planted area and the restoration of degraded environments.
Based on the importance of substrate for seedling production and use of renewable materials
in its formulation, the aim of this work was to characterize the physical properties of
renewable substrates composed by coconut fiber and composted sludge and evaluate the
feasibility of using these substrates in the production of seedlings of Eucalyptus grandis and
Acacia mangium. Therefore, there were three studies. The sources of organic materials used
for the composition of the substrates were commercial substrate, coconut fiber and
composted sludge (waste from the tomato processing industry). The treatments were:
commercial substrate; commercial substrate + 10% sludge; commercial substrate + 20%
sludge; commercial substrate + 40% sludge; coconut fiber; Coconut fiber + 10% sludge;
coconut fiber + 20% sludge and coconut fiber + 40% sludge. In the first study were
performed following physical analysis of formulated substrates: volume density, particle
density, porosity, air space, readily available water, buffering water, available water, the
remaining water of 100 cm and water retention capacity. It was observed that treatments
showed a great variability in the physical characteristics and no advantage in doing mixtures
to obtain a more efficient substrate on these properties. As a conditioner of the mixes, the
composted sludge promoted increased density, reduced porosity and increased water
retention capacity. In the second study, parameters relating to the growth of Eucalyptus
grandis seedlings were evaluated, and the third study evaluated parameters relating to the
growth of Acacia mangium seedlings. The evaluated parameters were: plant height, stem
diameter, dry matter of aerial part and radicial part, ease of removal of the cartridge
seedlings, roots aggregation of the substrate and chemical analysis of the aerial part of the
plant. The results showed that the use of sludge and composted coconut fiber as substrate
for the production of Eucalyptus grandis and Acacia mangium seedlings is a promising
alternative because it resulted in the adequate development of the same. The use of organic
waste in the substrate composition for the production of forest trees seedlings is a
technically feasible option and is an alternative to recycling and use of by-products of
agribusiness.
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JESUS, R. P. Qualidade de mudas de eucalipto e acácia em substratos de resíduos agroindustriais. 2016. 167 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2016.