AVALIAÇÃO DOS ATRIBUTOS DE UM CAMBISSOLO HÁPLICO E CRESCIMENTO INICIAL DE Eucalyptus benthamii APÓS A APLICAÇÃO DE BIOCARVÃO NA REGIÃO DE IRATI-PR

Abstract

The goal of this research was to evaluate the chemical and physical soil after incorporation of biochar in a Eucalyptus benthamii plantation. The study was conducted at the UNICENTRO experimental area, in Irati city, Paraná State, Brazil. We used four doses of biochar: 0, 10, 20 and 40 t ha-1 with and without mineral fertilizer 340 kg/ha of NPK with 14 kg N, 48 kg P2O5, 28 K2O kg formulated in 4-14-8, with a complete randomized block design with four replications. The results showed that in chemical properties, significant differences were found 60 days after the incorporation of biochar for K+ contents and pH. At 195 days there were significant differences for pH, Ca+2, Mg+2, Al+3, potential acidity, base saturation and aluminum saturation. The amount of ash in the formation of biochar contribute to the elevation of exchangeable bases in place of exchange, causing an increase in pH, reducing acidity and aluminum toxicity and greater retention of nutrients at the highest dose. The physical attributes to the soil moisture treatment of 40 t ha-1 differed significantly from other treatments. The porous structure of char retains more water, and form aggregates with the mineral soil contributing to this increase. This increase was observed for a clay soil, showing that biochar becomes hydrophilic when incorporated aiding in increasing the water content. Height and diameter of Eucalyptus benthamii varied according treatments. From 120 days after planting, the factor was statistically different biochar. Regression analysis showed a quadratic trend in the doses 20 and 40 t ha-1 were compared to the controls and the dose 10 t ha-1 at 180 and 210 days for the plant height. You could say that this factor contributed during the period for plant growth due to nutrient and water higher.