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Profitability of fertilization at establishment of Eucalyptus globulus plantations

Abstract:

Application of fertilizers in plantations of Eucalyptus globulus Labill plantations is essential for increasing productivity. Thus, the economic feasibility of nitrogen and phosphorus fertilizer dosage at establishment was determined in a five-year-old plantation in coastal sector of the VIII Region of Chile. The treatments (T) were T1 (N<inf>50</inf>P<inf>50</inf>); T2 (N<inf>100</inf>P<inf>100</inf>); T3 (N<inf>200</inf>P<inf>100</inf>; T4 (N<inf>200</inf>=P2<inf>00</inf>); T5 (N<inf>300</inf>P<inf>200</inf>; T6 (N<inf>300</inf>P<inf>400</inf>); T7 (N<inf>300</inf>P<inf>400</inf> + K<inf>2</inf>O), T8 (N<inf>300</inf>P<inf>400</inf> + FGC; and a control TO (N<inf>0</inf>P<inf>0</inf>. The variables projected to the age of harvest were volumetric growth of the trees and profitability (net present value, NPV; internal rate of return, IRR; potential land value, PLV). Significant differences (p≤0.05; Tukey) were found for all of the variables studied. The best treatments in volumetric growth at harvest were T3 and T8. As for profitability, the best NPV values were US$ 717 ha-1 and US$530 ha-1 for T3 and T1, where the fertilization produced an increase of US $415 ha-1 and US$ 228 ha-1. It is concluded that applying low dosages of fertilization (T3 and T1), increases in productivity and profitability of the crop are achieved; but increasing fertilization dosages would decrease profitability.