Two field trials were carried out to study the effect of 16 treatments represented the combination between four concentrations of kinetin (0.0, 20, 40 and 60 ppm.) and four levels (0.0, 2, 4 and 6 g/plant) of mineral fertilization on the growth, flowering, bulb productivity, chemical composition and histological features of Hippeastrum vittatum plant.Results showed that all tested kinetin concentrations statistically improved vegetative growth parameters i.e., plant height, number of leaves, leaves fresh weight and leaves dry weight, flowering growth parameters i.e., flowering start, inflorescence length, flowering stem diameter and inflorescence fresh weight, bulb growth parameters i.e. bulb diameter, fresh and dry weight of bulb, number and diameter of bulblets, chemical composition parameters i.e., N, P, K, total carbohydrates and total chlorophylls contents as well as endogenous phytohormones i.e. cytokinins, gibberellins, auxin (IAA) and abscisic acid (ABA) and histological features of Hippeastrum vittatum leaf with superior to the medium and high rates.
Also, all mineral fertilization levels significantly improved the aforementioned parameters, especially the high levels. Additionally, most the combinations of kinetin concentrations and levels of mineral fertilization improved all the studied parameters, particularly combinations between kinetin at 60 ppm and mineral fertilization at 6 g/plant in both seasons. As for the anatomical studies, several alternations were existed with different applied treatments. Most of the combinations between kinetin concentrations and levels of mineral fertilization gave the highest parameters values in transfer sections of the blade as compared with the control. The most effective treatment was kinetin at 60 ppm combined with mineral fertilization at 6 g/plant.
Conclusively, spraying Hippeastrum vittatum plants with kinetin at 60ppm and mineral fertilization with N:P:K at the ratio of 2:1:2, respectively induced prospective effects on vegetative growth and flowering parameters with higher bulbs productivity.
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