Desenvolvimento de dois híbridos de eucalipto sob níveis e épocas de adubação mineral em Dois Vizinhos - PR

Abstract

In the year 2012 the trade balance of the Brazilian forest-based industry closed the year with U.S. $ 5.5 billion expanding its share in the surplus which increased from 19.1% to 28.1 %, as well as generating 4.4 million jobs. Due to these factors and demand in increasing productivity and adaptability multiple industries are developing hybrids of Eucalyptus as E. urograndis an intersection of E. urophylla with E. grandis to improve their genetic qualities. This crossing is not adapted to very cold climates, it presents ideal conditions for the growth and greater volumetric efficiency among species. The objective was to review the development of two eucalyptus hybrids under two fertilization levels with 90 and 180 g plant - 1 formulation of N , P2O5 and K2O respectively 12-32-18, applied 30 days after planting and one year cultivation. Were used for the cultivation of hybrid clones Eucalyptus urograndis, distribution of seedlings was performed with 3 x 2 meter spacing, ie 2 meters between plant and 3 feet between rows. In an area totaling 2.4 hectare. The treatments were arranged in a factorial arrangement in a split plot (2x2x2). In the main plot will be allocated two clones (1040 and 8080) of the hybrid Eucalyptus urograndis the subplots two doses of fertilizer application (90 and 180 g plant-1) of mineral fertilizer application at planting and fertilizing in the subsubplots coverage of the same formulation (90 g plant-1 and 0 g plant-1) after 10 months of planting. In each plot was measured the diameter at breast height (DBH), height, realization of cubed tree standing by Smalian method to determine the form factor and then calculating the volume. The hybrid Eucalyptus urograndis 1040 achieved the best results with an average DBH of 4.61 cm, 5.49 average overall height me an average volume of 9.45 m³ ha-1 compared to Eucalyptus urograndis 8080 . During these reviews became evident that the addition of 90 grams of manuring did not influence so far in DAP, plant height and wood volume, however the fertilizer application of 180 g plant-1 was superior to the use of 90 g plant-1.