MARCHA DE ABSORÇÃO DE MICRONUTRIENTES PELO ABACAXIZEIRO ‘PÉROLA’ NA REGIÃO DE TABULEIROS COSTEIROS DA PARAÍBA

Abstract

There is lack information about the actual requirements of micronutrients for pineapple during their cycle. The objective of this work was to evaluate the accumulation curves of the micronutrients B, Cu, Fe, Mn and Zn by 'Pérola' pineapple under the edaphoclimatic conditions at Coastal Tablelands of Paraiba state. The experiment was carried out in a Red- Yellow Ultisol in the Itapororoca county, and conducted under rainfed conditions from May 2014 to May 2016. The randomized block experimental design was used, with three replicates, under split plots scheme. The factors were eight components of the plant (roots, leaves A, B, and C, leaves D, leaves E and F, peduncle, seedlings, and inflorescence/ infructescence) and nine sampling periods (120, 197, 257 , 334, 364, 469, 568, 591 and 745 days after planting (DAP). There were two periods of intense accumulation of dry matter (the first between 197 and 334 DAP and the second between 469 and 591 DAP). The period of greatest demand differed between micronutrients: B (between 334 and 469 DAP), Cu (vegetative phase - 197 and 334 DAP and reproductive - 469 and 591 DAP), Fe (vegetative phase - 197 and 257 DAP and reproductive 591 and 745 DAP), Mn (between 257 and 334 DAP) and Zn (between 334 and 568 DAP). At the end of the cycle (745 DAP) the decreasing order of micronutrient accumulation was: Fe> Mn> B> Zn> Cu, with the following accumulated amounts: 6038, 2859, 1058, 367 and 67 g/ha, respectively. The decreasing order of micronutrients export by fruits and seedlings was: Fe> Mn> B> Zn> Cu, with exports: 1980, 1404, 645, 232, and 51g/ha, respectively.