Brazil is one of the countries with the greatest biodiversity, being covered by diverse ecosystems. Native trees commercially planted generate numerous benefits for communities, providing cultural, recreational, tourism riches, as well as ecological benefits, such as nutrient regulation and carbon sequestration. Thus, this work aimed to generate potential distribution modeling for the Brazilian forest species, to provide information that will serve as a strategy for conservation, restoration and commercial plantation of them, that is, encouraging the use of legal native species in the forest sector. Eleven tree species and 19 bioclimatic variables were selected. The software Maxent 3.3.3 was applied in the generation of the distribution models and the area under the curve of receiver operating characteristic (AUC) was used to analyze the model. The Jackknife test contributed to identify which bioclimatic variables are most important or influential in the model. The models showed AUC values ranged from 0.857 to 0.983. The species with higher AUC values were Araucaria angustifolia, Mimosa scabrella and Euterpe edulis, respectively. The maximum temperature of warmest month showed the highest influence for the most species, followed by the mean diurnal range and annual precipitation. It was observed that for some species, there were restricted areas of environmental suitability, such as Araucaria angustifolia, Ilex paraguariensis and Mimosa scabrella. The models used could trace the potential distribution areas using the environmental variables, and these models contribute significantly to sustainable forest management.

Boron (B) deficiency in forest production systems has been reported in several eucalyptus species. The low biochemical cycling of B and the leaching losses justify the need for effort to get the fertilization of this nutrient right. In this context, the efficiency of three sources of boron with different solubilities was evaluated in a dystrophic Red Latosol, with a sandy loam texture, in eucalyptus crops at juvenile age. Ulexite (10% boron), boric acid (17,2%), and sodium tetraborate (15%) were evaluated, providing 800 g ha-1 of B. For comparison, a control without boron was used, totaling four treatments in a randomized block design. To evaluate growth and productivity, total height (Ht) and diameter at breast height (DBH) were analyzed at 12 months, in addition to analysis of plant tissue at the end of this period. There was an influence of borate fertilization on the initial growth of eucalyptus (Clone I 144). Although there was no interaction between the sources of boron in the development of the initial dendrometric attributes, there was variation between the sources in relation to the concentration of boron in the plant tissue.

With regard to agribusiness, one of the areas that is constantly developing is the segment of trees grown for industrial purposes,

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Organomineral fertilization is a sustainable alternative to the use of mineral fertilizers in forest plantations, promoting stands establishment of high volumetric productivity. This work aimed to evaluate volumetric production of eucalypt under different organomineral fertilization regimes. Four fertilization regimes were tested: three treatments with use of organomineral fertilizers and one with mineral fertilizers. Continuous forest inventory was conducted from 12 to 72 months. Three permanent plots were established for each fertilization regime, totaling 12 sample units. Growth in height, basal area and volume differed between fertilization regimens over age. Treatment that provided the best development in first years of cultivation was not necessarily the one with higher volume production. Biometric estimates were higher with application of organomineral fertilizers. Volumes at 72 months of these treatments ranged from 180 to 192 m3 ha-1. Organomineral fertilization of plantation and cover is an efficient sustainable alternative to obtain high yields in eucalypt crops. Application of only one organomineral cover fertilization favors volumetric production of the clone and reduces interventions in cultivation area.