Abstract
Urban organic waste has been gaining prominence in the composition of substrates, as it is a source of natural nutrients and a sustainable alternative to mitigate environmental impacts caused by improper waste disposal. The aim of this study was to characterize chemically and physically substrates based on organic waste and to evaluate the development of Colubrina glandulosa seedlings using composted urban tree pruning waste. Treatments consisted of different proportions of organic compost (CP), soil from the A horizon (SAH), aged manure (BM) and vermiculite, kept in tubes (Citropote®) with volume of 1.7 L. C/N ratio, water holding capacity (10 hPa), electrical conductivity, macroporosity, microporosity and total porosity of substrates before their use were determined. Substrate fertility analyses were carried out before and after seedling production. During the development of the seedlings, height (H) and stem diameter (SD) were measured at 60, 90 and 120 days. At 90 and 120 days, the seedlings were divided into shoots and roots to determine the dry mass of each compartment, Dickson quality index (DQI) and contents of nutrients (N, P, K, Ca and Mg). After the analysis of the results, it can be observed that the treatments with high proportions of CP had better physical characteristics, but also showed chemical limitation in the development of the seedlings. Treatments based on BM, SAH and lower proportion of CP had the highest average results for H, SD, H/SD ratio and DQI.
Highlights
In the search for sustainable alternatives and mitigation of environmental impacts, the use of urban organic waste in the composition of fertilizers and substrates becomes a viable alternative in the production of seedlings, aiming at the reuse of nutrients contained in these materials and the reduction of production costs
The substrates T3 and T4 showed the best physical properties, with MacroP, total porosity (TP) and water holding capacity at 10 hPa (WHC10) classified as adequate (GONÇALVES; POGGIANI, 1996)
When bovine manure was added to the substrate composition, the values of C/N ratio were lower, but still above the ideal range
Summary
In the search for sustainable alternatives and mitigation of environmental impacts, the use of urban organic waste in the composition of fertilizers and substrates becomes a viable alternative in the production of seedlings, aiming at the reuse of nutrients contained in these materials and the reduction of production costsFLORESTA, Curitiba, PR, v. 51, n. 2, p. 381-390, abril/jun 2021.Mendonça, V. In the search for sustainable alternatives and mitigation of environmental impacts, the use of urban organic waste in the composition of fertilizers and substrates becomes a viable alternative in the production of seedlings, aiming at the reuse of nutrients contained in these materials and the reduction of production costs. Biomass from urban tree pruning can constitute a relevant part of all waste generated in a city. Tree pruning waste is in Class II, along with cardboard and paper, and may have the properties of combustibility, biodegradability and solubility in water. Due to these characteristics, green waste becomes potential environmental polluters, so their stabilization and correct disposal are essential
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