Effect of gibberellic acid and chemical fertilizers on growth and chemical composition of Cryptostegia grandiflora, R. Br. plants
2009
Hussein, M.M.M.
Results showed that GA3 and/or chemical fertilization treatments increased the values recorded for most of the different vegetative growth parameters (vine length, number of internodes of main vine, average internode length, stem diameter, number of branches/plant, leaf area, fresh and dry weights of leaves, stems and roots/plant), as well as the N and K percentages in leaves, compared to the untreated plants. In most cases, increasing GA3 concentration resulted in steady increases in these parameters. Total chlorophylls, total carbohydrates and P concentrations were decreased by GA3 treatments and increased by chemical fertilization treatments. Raising the application rate of each type of chemical fertilizer resulted in steady increases in the values of most of the studied growth parameters. In most cases, at the same fertilization rate, the slow-release fertilizer Regal Nursery gave higher values for most of the vegetative growth and chemical characteristics, compared to the conventional NPK fertilizer. In most cases, combining GA3 at 50 ppm with the highest rate of Regal Nursery (21 g/plant/4 months) gave values that were insignificantly different than the highest values recorded for most of the vegetative characteristics, which were obtained in plants sprayed with GA3 at 100 ppm and supplied with the highest rate of Regal Nursery. From the obtained results, is recommended that, for the best vegetative growth of Cryptostegia grandiflora, the plants may be sprayed with GA3 at 50 ppm and supplied with 21 g/plant/ 4 month of the slow- release fertilizer Regal Nursery (24 N -8 P2O5 -8 K2O).
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