EFFECT OF CHEMICAL NITROGEN FERTILIZER LEVEL AND HUMIC ACID RATE ON Gladiolus grandiflorus PRODUCTIVITY

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Dept. Plant Prod., Fac. Environ. Agric. Sci., Arish Univ., Egypt.

Abstract

A field experiment was conducted at the Experimental Farm, Faculty of Environmental Agricultural Science, Arish University, Egypt, during two successive seasons 2017-2018 and 2018-2019 to study the effect of various levels of nitrogen fertilizer (0, 100, 200 and 300 kg fed-1) in combination with different rates of humic acid (0,150, 250 and 350 ppm) as a foliar spray on plant growth, flowering characteristics, corms and cormels characteristics and chemical constituents. The obtained results cleared that using 200 kg fed-1 nitrogen in urea forms with 350 mg l-1 humic acid as a foliar spray gave the maximum value in each of vegetative growth parameters, flowering characteristics, diameter of corms, weight of cormel, and chemical constituents (N,P and K) content in leaves. However, a non-significant variation was observed in the treatment 200 kg fed-1 nitrogen with the three concentrations of humic acid for weight of corms and No. of cormels in plants in most cases. While, plants grown without nitrogen and humic acid (control) gave the minimum values in all parameters.

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