INFLUENCE OF DIFFERENT DOSES OF PHOSPHORUS IN THE GROWTH OF CUMARU SEEDLINGS

Abstract

This work has the objective of evaluating the effect of different phosphorus dosages in the growth of Cumaru (Dipteryx odorata (Aubl.) Willd.)  seedlings in nursery conditions. The experiment was conducted in experimental nursery at the Universidade Federal do Oeste do Pará-UFOPA in the period from June to September 2016. The experimental delineation used was entirely ignited, with 5 treatments and 4 repetitions, totaling 20 parcels. The test treatments were made: witness (no addition of phosphorus), 100, 200, 400, 800 kg/ha of simple phosphate. The growth in height, colt diameter, fresh air mass, root mass, total fresh mass, dry drought mass, root drought mass, total drought mass and, subsequently, Dickson Quality Index were evaluated. They followed the Kolmogorov-Smirnbov tests for data normality, Bartlett for homogeneity of the variations of the treatments and Fischer for Analysis of Variance and the medias compared to Tukey's test at 5% probability. It is concluded that the dosage of 200 Kg/ha of P is the most significant treatment for the development in nursery. As regards the parameters of the morphological development of the plates, they appeared not significant to all treatments based on phosphate fertilization. The calculated seedling quality index (IQD) indicated that all levels of phosphate fertilizer tested, weighed seedlings suitable for field installation, after 60 days in nursery conditions.KEYWORDS: Dipteryx odorata, Mineral nutrition, Vegetal physiology.