ISHS Acta Horticulturae 822: VI International Pineapple Symposium
MORPHOLOGICAL CHARACTERISTICS OF 'IMPERIAL' PINEAPPLE FRUITS UNDER DEFICIENCY OF MACRONUTRIENTS AND BORON |
| Authors: | M.J.M. Ramos, P.H. Monnerat, L.G. da R. Pinho, A.J.C. Carvalho, J.A. da Silva |
| Keywords: | fruit quality, nutrient solution, fruit weight, nutrient concentration, peel thickness |
| Abstract:
A work was carried out under greenhouse condition in Campos dos Goytacazes, RJ, Brazil, in order to evaluate the influence of macronutrient and boron deficiencies on morphological characteristics of 'Imperial' pineapple fruits. The treatments Complete, - N, - P, - K, - Ca, - Mg, - S and - B were applied as nutrient solutions in plastic pots with 14 kg of purified beach sand and one pineapple plant as the experimental unit. The trial was set up in a randomized complete blocks design with six replications. At fruit harvest the following data were obtained: fruit and crown weights, crown, fruit and peduncle length, peduncle and fruit diameter and rind thickness, in addition to macronutrient and boron leaf concentrations determined at 5, 7, 9 and twelve months after planting. Except for S, all deficiencies reduced fruit weight and diameter. Nitrogen deficiency reduced fruit weight with crown by 58.6% and without crown by 65.7% and fruit length by 44.4%. Potassium deficiency reduced the peduncle diameter by 23.4% and boron deficiency by 35.0%. Sulfur deficiency reduced fruit crown length. Fruit peel thickness was not affected by the deficiencies studied. Leaf nutrients concentration was significantly lower in their deficiency treatments in relation to the treatment with complete nutrient solution, for all four sampling dates studied. | |
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