Effect of Visible Light Blocking Ratio, Irrigation Intervals and Free Amino Acids on Vegetative Growth Parameters of Chrysanthemum

Objectives: An experiment was conducted under plastic shades set up for this purpose in the Mashroo Almussaib area (45 km north of Babil Province) to improve vegetative growth indicators for chrysanthemum plants Minngopher cultivar with red flowers. Methods: Use 3 factors in the experiment include the first factor different percentages of visible light blocking (50 and 75) %, The second factor treating plants with three Irrigation Intervals (daily, every 24 hours, and every 48 hours) as for the third factor spraying plants with several concentrations of free amino acids (0,1, 1.50 and 2.00) mg L-1. The experiment design in a (2x3x4) factorial design using a R.C.B.D. with three replicates per treatment. Each replicate contained three pots, each with one plant. The results: Showed the study factors have significant impact of the studied parameters, the interaction (75% shading, daily irrigation, and 150 mg L-1) give significant impact in the number of leaves (129.0 leave) and the length of the vegetative branch (15.33 cm) while achieved the triple treatment (75% shading, daily irrigation, and 200 mg L-1) significant impact in number of vegetative branches (7.67 vegetative branches) and the main stem diameter (6.76 mm), as for the height of the plant, the interactions treatment was impact (75% shading, daily irrigation, and 100 mg L-1). Conclusions: From here we conclude that shading ratios play an important role in reducing the impact of stress intensity humidity and thermal associated with treating plants with free amino acids spraying on vegetative plant.