A B S T R A C TThe objective was to determine the growth and accumulation of macronutrients of two pineapple cultivars submitted to different concentrations of aluminum (Al). For this, a study was conducted in plastic pots containing 4 L of nutrient solution, in a randomized block design, in a 2 x 5 factorial scheme, corresponding to two pineapple cultivars ('IAC Fantástico' and 'Vitória') and five Al concentrations (0, 21.6, 43.2, 64.8 and 86.4 mg of Al plant -1 ), with four replicates. The following variables were evaluated: root length, dry matter of root, stem and leaf, stem diameter, number of leaves, chlorophyll content and accumulation of macronutrients at 60 days after treatment. The cv. 'Vitória' showed a linear decrease in chlorophyll content, root dry matter, root length and accumulation of N, P, K, Ca and Mg in most plant components promoted by the increase of Al concentration in the nutrient solution. The cv. 'IAC Fantástico' had lower total dry matter, stem dry matter, stem diameter and accumulation of N, Ca and Mg. However, the evaluated characteristics were not influenced by the increase of Al concentration, showing greater tolerance of this cultivar to Al in nutrient solution.Acúmulo de macronutrientes e crescimento de cultivares de abacaxizeiros submetidos ao estresse por alumínio R E S U M O Objetivou-se, neste trabalho, determinar o crescimento e o acúmulo de macronutrientes de duas cultivares de abacaxi submetido a diferentes concentrações de alumínio; para isto foi realizado um estudo com vasos de plástico contendo quatro litros de solução nutritiva e utilizado o delineamento em blocos casualizados em esquema fatorial 2 x 5 sendo duas cultivares de abacaxi (IAC Fantástico e Vitória) cinco concentrações de alumínio (0, 21,6; 43,2; 64,8 e 86,4 mg de Al planta -1 ) e quatro repetições. Foram avaliados o comprimento de raiz, a matéria seca da raiz, o talo e as folhas, diâmetro do talo, emissão de folhas, teor de clorofila e acúmulo de macronutrientes aos 60 dias após os tratamentos. A cv. Vitória apresentou decréscimo linear no teor de clorofila, matéria seca de raízes, comprimento da raiz e acúmulo de N, P, K, Ca e Mg, na maioria dos componentes da planta promovidos pelo aumento da concentração de Al na solução nutritiva. A cv. IAC Fantástico teve menor massa de matéria seca total, matéria seca do talo, diâmetro do talo e acúmulo de N, Ca e Mg; no entanto, as características avaliadas não foram influenciadas pelo aumento da concentração de Al indicando maior tolerância desta cultivar ao Al em solução nutritiva.

The present study was carried out with the objective of evaluating the effect of artificial pollination and gibberellic acid (GA 3) in different doses and times of application in the fruit set, effective fruiting and the quality of 'Gefner' atemoieira fruits. The experimental design was in randomized blocks, with thirteen treatments, four replicates and five plants per plot. The treatments applied were different doses of GA 3 : 100, 150, 200, 250, 500 and 1000 mg L-1 associated or not with artificial pollination. It was evaluated every seven days the fruit set, length and diameter of the fruits, and after the harvest the physical and chemical characteristics of the fruits. The growth rate of fruit length and diameter showed a sigmoid pattern with the highest growth peaks in all treatments at the 4 th and 5 th weeks after the anthesis. The application of 1000 mg L-1 GA 3 , without artificial pollination, divided in four times from the anthesis yielded seedless fruits with physical and chemical quality equivalent to the fruits of artificial pollination. The artificial pollination associated to two applications of 250 mg L-1 of GA 3 showed high fruit set and fruits with greater length, diameter, mass of the fruits and reduction of the total fresh mass of the seeds.