Abstract

The study on nutritional needs of the tree species T. vulgaris, has a great contribution to the formation and conduction of plantations, resulting in their choice in terms of the potential that has been demonstrated in the comparative trials of fast growing species (more than 0.60 m/year in height) and strong regional demand for firewood and coal. The objective of this study was to evaluate the growth of T. vulgaris in response to the application of nitrogen, phosphorus and potassium, from the beginning of the establishment until the second year after planting. The study was carried out in the municipality of Igarapé-Açu-PA, in a T. vulgaris plantation of 1.44 ha (14,400 m²), spacing of 2 m × 3 m (plants × lines). The treatments consisted in the use of commercial products urea, super triple phosphate and potassium chloride as source of N-nitrogen, phosphorus-P₂O₅ and potassium-K₂O respectively, forming 8 treatmentswhich were analyzed using measures repeated in time. Treatment with combined doses of nitrogen and potassium contributed to a higher growth in height and diameter when compared to plants without fertilization. Fertilization of nitrogen (26.67 g) plus potassium (30 g) contributed to a higher planting growth.

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