Abstract
ABSTRACT The aim of this study was to evaluate production profitability of Croton urucurana and Cytharexyllum myrianthum seedlings produced in substrates composed of mixtures of composted biosolids and carbonized rice husk in different concentrations of nutrient solution. Seedlings were subjected to three doses of fertigation solutions. In order to check quality standards which indicated production cycle, the height, stem diameter and root quality were evaluated. Economic viability was determined by indicators of economic attractiveness commonly used for investment projects. Production costs of seedlings varied according to the production cycle, substrate compositions and nutritional management. The substrate with higher volume of composted biosolids and lower concentrated fertilizer was the one with the highest profitability and the lowest production cost.
Highlights
The use of organic materials in substrate composition is a good alternative for waste disposal as well as a source of plant nutrients which can reduce input high costs required for production of forestry seedlings (Trazzi et al, 2013)
Simões et al (2012), testing different substrate compositions via seminal seedling production of Eucalyptus grandis × Eucalyptus urophylla, observed that the shorter time of seedling in nursery influenced the reduction of seedling production costs, suggesting the use of substrates which allow a higher development and quality of seedlings within a shorter period
Production cycle was different, which varied production costs and economic indicators. Both species seedlings grew under substrate composed of composted biosolids (S2 and S3) reached quality patterns considered fit for planting (Fonseca et al, 2002; Simões et al, 2012) at 176 days after sowing (DAS)
Summary
The use of organic materials in substrate composition is a good alternative for waste disposal as well as a source of plant nutrients which can reduce input high costs required for production of forestry seedlings (Trazzi et al, 2013). Biosolids is an example of such material from sewage treatment waste or wastewater and varies according to its origin (industrial or sanitary). It contains organic matter and nutrients for plant uptake like nitrogen, phosphorous, calcium and magnesium (Singh & Agrawal, 2008). The cost of eucalyptus seedlings at planting and replanting was 14.63% of the implementation cost of a reforestation area in Bahia state, according to Virgens et al (2016). Vasconcelos et al (2012) analyzed the costs of four forestry nurseries and concluded that the effective cost management is important for the success of the venture, which demands accurate cost control as well as investment plans
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