Response of snapdragon plant (Antirrhinum majus l.)‎ to foliar spraying with tryptophan and zinc sulfate

الملخص EN

The experiment was conducted during the autumn season (2018-2019) in one of the greenhouses belonging to Research Station of Department of Horticulture and Landscape Gardening, College of Agriculture, University of Diyala.

The research was conducted for the period from 8/11/2018 to 25/5/2019, to study the effect of foliar spray with Tryptophan at concentrations of (100, 150, and 200 mg.

L-1), in addition to spraying with distilled water as a control treatment and foliar spraying with zinc sulfate at concentrations (0, 1, 2, and 4 g.

L-1) in the growth and flowering of Snapdragon plant (Antirrhinum majus L.

) Monaco cultivar.

Plants were sprayed with tryptophan and zinc sulfate twice after 30 and 45 days of seedling, with two days separator between spraying tryptophan and zinc sulfate.

The research was conducted as a factorial experiment (4 × 4) according to Randomized Complete Block Design (RCBD), with three random replicates.

The study showed that the treatments of foliar spraying with tryptophan led to improving all the traits of the vegetative and flowering growth for the Snapdragon plant, where the spraying treatment with tryptophan at a concentration of (200 mg.

L-1) has excelled by recording it the highest results compared to the control treatment.

Foliar spraying of plants with zinc sulfate improved all the vegetative and flowering traits for the Snapdragon plant, where the spraying treatment with zinc sulfate at a concentration of (4 g.

L-1) was significantly excelled by recording it the best results compared to the control treatment.

The result of the interaction between the foliar spraying with tryptophan and zinc sulfate showed a significant effect on all traits of the vegetative and flowering growth for the plant, where the interaction treatment between the spraying with tryptophan at a concentration of (200 mg.

L-1) and spraying with zinc sulfate at a concentration of (4 g.

L-1) was significantly excelled by recording it the best results for the studied vegetative and flowering traits.