EFFECT OF TRYPTOPHAN, Fe, Zn AND Mn FOLIAR APPLICATION ON GROWTH, PRODUCTIVITY AND CHEMICAL COMPOSITION OF ROSELLE PLANTS | ||||
| Journal of Biological Chemistry and Environmental Sciences | ||||
| Volume 3, Issue 1, March 2008, Page 771-790 PDF (567.98 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/bces.2008.426874 | ||||
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| Abstract | ||||
| Two-field trials were conducted at the Experimental Farm of the Hort. Dept., Faculty of Agric., Moshtohor Benha Univ during 2006 and 2007 seasons. Experiments aimed to study the effect of foliar spray with tryptophan at 0.0, 50, 100 and 150 ppm. and foliar nutrition with Fe, Zn and Mn each at rates of 150 ppm. plus the control on growth, yield and chemical constituents of roselle plants. Plants were sprayed with tryptophan, Fe, Zn and Mn three times started at 45 days after planting and at three weeks intervals. Experimental design was split plot; tryptophan arranged in the main plots and micronutrients were arranged in sub plots. Results showed that, foliar spray with tryptophan supplemented with Fe, Zn and Mn treatments enhanced most growth and productivity parameters, such as plant height, number of branches, fresh and dry weights of branches/plant, number of leaves, fresh and dry weights of leaves/plant and also, increased each of fruits number, fresh weight of fruits /plant, fresh and dry weights of sepals /plant as compared with control in both seasons. Moreover, total carbohydrates % and sepals acidity, N%, P%, K%, anthocyanin and vitamin-C content were increased by spraying roselle plants with all concentrations of the used treatments. Generally, tryptophan foliar application at rates 50, 100 and 150 ppm. increased all growth and yield parameters especially the high rate (150 ppm.) compared with control in both seasons. Furthermore, Fe, Zn and Mn foliar nutrition at 150 ppm. of each increased the plant height, number of branches, fresh and dry weights of branches/plant, number of leaves, fresh and dry weights of leaves/plant and also, EFFECT OF TRYPTOPHAN, Fe, Zn AND Mn FOLIAR772 increased number of fruits/plant, fresh weight of fruits/plant, fresh and dry weights of sepals/plant., total carbohydrates% and sepals acidity, N%. P%, K%, anthocyanin and vitamin-C content as compared with control plants. The most favorable growth, yield and the highest chemical content were obtained when plants sprayed with the three micronutrients (Fe+ Zn+Mn) each at 150 ppm. in both seasons. Furthermore, the combinations resulted from the interaction between spraying tryptophan at rates (50, 100 and 150 ppm.) and foliar nutrition of Fe, Zn and Mn at 150 ppm. for each increased plant height, number of branches, fresh and dry weights of branches/plant, number of leaves, fresh and dry weights of leaves/plant and also increased fruit's number/plant, fresh weight of fruits/plant, fresh and dry weights of sepals/plant., total carbohydrates% and sepals acidity, N%. P%, K%, anthocyanin and vitamin-C content compared with control plants in the first and second seasons. Consequently, it can be safely spray Hibiscus sabdariffa plants with tryptophan at 150 ppm. supplemented with foliar nutrition with (Fe+Zn+Mn) each at 150 ppm. to enhance the most growth, yield and chemical constituents of roselle (Hibiscus sabdariffa, L.) plants. | ||||
| Keywords | ||||
| Key Words: Roselle; Hibiscus sabdariffa; tryptophan; branches; fruits; sepals; carbohydrates; acidity; vitamin-C and anthocyanin | ||||
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