ISHS Acta Horticulturae 822: VI International Pineapple Symposium
GROWTH AND FLOWERING OF 'IMPERIAL' PINEAPPLE PLANTS UNDER MACRONUTRIENT AND BORON DEFICIENCY |
| Authors: | M.J.M. Ramos, P.H. Monnerat, L.G. da R. Pinho, J.L. de A. Pinto |
| Keywords: | Ananas comosus var. comosus, nutrient solution, number of leaves, concentration of nutrients |
| Abstract:
This work was carried out under greenhouse conditions to evaluate the influence of macronutrient and boron deficiencies on growth and flowering of 'Imperial' pineapple plants. 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. Evaluations were done on fresh and dry weight, length and width of 'D' leaves, ‘D’ leaf area and number of leaves at forcing date and percentage of flowering in response to forcing. In addition, foliar concentrations of macronutrients and boron were determined. The deficiencies of N and K reduced fresh and dry weight, length, width and area of ‘D’ leaves at nine and 12 months after planting; that of Ca reduced fresh weight and ‘D’ leaf area at 12 months and the deficiencies of P, Mg, S and B did not significantly affect the leaf variables studied. At seven months after planting only N deficiency reduced leaf number and ‘D’ leaf area. The deficiencies of K, P, Ca and S accelerated flowering, while those of N and Mg delayed it. The appropriate and deficient concentrations in leaf dry matter at time of floral induction were, respectively: N = 14.8 and 6.6; P = 1.37 and 0.70; K = 23.0 and 11.6; Ca = 4.40 and 1.30; Mg = 2.30 and 0.90, S = 1.54 and 0.56 (all expressed as g kg-1), and B = 20.0 and 5.6 mg kg-1. | |
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