Abstract
With the recent expansion of Eucalyptus dunnii Maiden cultivation in central region of Rio Grande do Sul state, recurrent questions arise from both research and operational silviculture, especially in relation to mineral fertilization. The objective of this study was to test the effect of fertilizer dose increase (150, 225 and 450 g plant-1 of N-P2O5-K2O, in 24:00:24 proportion) on the biomass production, carbon stock and nutrients in Eucalyptus dunnii trees cultivated in dystrophic Inceptisol, in central region of Rio Grande do Sul state, Brazil. This study revealed that there is no effect of the fertilizer dose increase on the accumulation of biomass, carbon and nutrients in components of Eucalyptus dunnii trees. The nutrients were more concentrated in leaves; in stemwood there was greater stock of carbon and potassium; in branches and stembark the calcium prevailed. Due to the significant biomass production, regardless of fertilizer dose, aiming at reducing costs and environmental impacts, it is recommended to apply mineral fertilization with 150 g plant-1 of N-P2O5-K2O, in 24:00:24 proportion, in Eucalyptus dunnii stand cultivated in dystrophic Inceptisol, in central region of Rio Grande do Sul state, Brazil.
Highlights
In the world there are 290.4 million hectares occupied with forest stands, where 20 million of these are Eucalyptus plantations (FAO, 2016)
Many species, including Eucalyptus dunnii, have not yet been studied as to the responses promoted by manipulation of mineral fertilization, and most studies were conducted in Eucalyptus grandis, cultivated in southeastern region of Brazil (SILVA et al, 2013; FARIA et al, 2002)
The objective of this study was to test whether there is an effect of increasing the fertilizer dose (150, 225 and 450 g plant-1 of N-P2O5-K2O, in 24:00:24 proportion) in biomass production, carbon stock and nutrients in Eucalyptus dunnii trees, grown in dystrophic Inceptisol in central region of Rio Grande do Sul state, Brazil
Summary
In the world there are 290.4 million hectares occupied with forest stands, where 20 million of these are Eucalyptus plantations (FAO, 2016). In Brazil, until 2016, the area with planted trees was 7.84 million hectares, an increase of 0.5% compared to 2015, due exclusively to the expansion of eucalyptus cultivation, which represents 71.9% of silviculture area in the country (IBÁ, 2017). There has been an expansion of silviculture, mainly in the central and western regions of Rio Grande do Sul state, in Pampa biome and, among the planted species, Eucalyptus dunnii Maiden stands out. G. et al ISSN eletrônico 1982-4688 adapted to edaphoclimatic conditions of the region, and stemwood biomass is destined mainly to cellulose and energy industry. In this expanding forest scenario, where the highest biomass production is expected in plantations in a short period of time, fertilization management becomes indispensable. Many species, including Eucalyptus dunnii, have not yet been studied as to the responses promoted by manipulation of mineral fertilization, and most studies were conducted in Eucalyptus grandis, cultivated in southeastern region of Brazil (SILVA et al, 2013; FARIA et al, 2002)
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