GROWTH OF Eucalyptus globulus SEEDLINGS IN RESPONSE TO NPK FERTILIZATION
2009
Raul Vicente Pezzutti | Mauro Valdir Scnumacher | Juarez Martins Hoppe
<p>The present study has had as its objectives to evaluate the seedlings of <em>Eucalyptus globulus </em>subspecies <em>maidenii</em>, in response to different NPK originated from the combination of slow release and quick release fertilizers. The study was conducted in a climatized green house ata the Technological Center of Forestry, in the Forest Department of the Federal University of Santa Maria-RS, from September to December of 1997. The plants were cultivated in a compost of pine bark substrate, in a completely randomized design, consisting of 4 treatments which consisted of Phosphorus dosages (60% of Super Simple (0-18-0)) and a slow release NPK fertilizer (14-14-14), known as Osmocote, which derived from ammonium nitrate, ammonium phosphate, calcium phosphate and potassium sulfate. The treatments, resulting from the combination of 60% super simple and 40% osmocote were 0,0; 2,5; 5,0 and 7,5 Kg m<sup>-3 </sup> of substrate. There were 4 repetitions of 11 plants for each treatment. After 100 days the height, collar diameter, above-ground dry matter, root dry matter and number of leaves were evaluated. The results indicate that the <em>E. globulus </em>subsp<em>. maidenii</em> seedlings growth responded positively to NPK fertilization [60% of Super Simple (0-18-0)+40% of slow release fertilizer (14-14-14)]; when the fertilizer was not applied the seedlings did not grow as much while the maximum increment in height, collar diameter, above-ground dry matter, root dry matter and number of leaves were obtained in the dosage range of 6,7 Kg m<sup>-3 </sup> to 7,5 Kg m<sup>-3 </sup> of substrate.</p>
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