MARCHA DE ABSORÇÃO DE MACRONUTRIENTES PELO ABACAXIZEIRO ‘PÉROLA’ EM SOLOS DE TABULEIROS COSTEIROS PARAIBANOS

Abstract

Despite the socio-economic importance of culture and the importance of mineral fertilizer in the production system the information on nutritional requirements of pineapple plant are still scarce in some regions of the state of Paraiba. This study aimed to evaluate the uptake of macronutrients by pineapple 'Pérola', at conditions of Itapororoca-PB. The experiment was conducted between the months of August 2014 and May 2015, in soil classified as Ultisol. The experimental design was a randomized block with treatments arranged in a factorial 6 x 5 with three replications. The factors studied were six morphological parts [root, stem, old leaves (A, B and C), intermediate (D), young (E and F) and whole plant] and five sampling times (120, 197, 257 , 334, 364 days after planting - DAP). Were evaluated at each time of collection, the dry matter production of its morphological parts, as well as the contents and accumulation of N, P, K, Ca, Mg and S. It was concluded that the pineapple has dry matter accumulation and nutrient slow early in the crop cycle (120-197 DAP), which intensifies in the period between 197 and 364 DAP, and reach maximum values between 334 and 364 DAP. The extraction of macronutrients by pineapple 'Pérola' followed the order: K> N> Ca> Mg> S> P, with accumulated amounts to 364 DAP of: 9.9; 5.5; 2.0; 1.2; 0.9 and 0.8 g plant-1, respectively. N, P, K and Mg are the macronutrients accumulated in greater amounts in older leaves, while Ca and S are more accumulated in the stem.