Fertilization at the establishment of Eucalyptus Grandis clones north of Corrientes. Response at 36 months.

Eucalyptus grandis is a fast growing species. It has high growth rates, and presents high nutritional demands, mainly in the first years of growth. As the cultivation sites have a history of previous use, with a probable decrease in the stock of nutrients, it is proposed to evaluate the response to the application of nitrogen (N), phosphorus (P) and potassium (K) in the establishment of a plantation of 5 clones (EG 1 INTA, EG 36 INTA, EG 152INTA, FTSA A-130-96 Forestadora Tapebicuá SA and 5-Clone DDT 02155 Pomera Maderas) of E. grandis on growth, for which a trial was installed north of Currents. It presented a randomized complete block design, with factorial arrangement of the treatments, which resulted from the combination of three doses of N (0, 45 and 90 g / plant), three of P (0, 90 and 180g / plant ) and three of K (0, 50 and 100 g / plant). 36 months after fertilization, the diameter was measured at breast height of all individuals, and from the statistical analysis of the data it appears that, when evaluating all the clones and treatments as a whole, a response to the application of 45-90-100 of NPK, with the highest diameter growth. In the individual response of each nutrient, it is highlighted that there was no response to the application of N, the application of P presented a positive response, regardless of the doses and in the case of K there was a positive response only to the highest dose. In relation to the clones, the highest growth in dbh (16.65 cm) was presented by the clone FTSA A-130-96, differing significantly from the others, and, in relation to the fertilization treatments, the responses of the clones were varied, but the lower general response to the 45-0-0 NPK treatment stands out.

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