| Abstrakt: |
This study was conducted in a private farm in Taza district, Kirkuk, Iraq for the period from 15/3/2019 to 15/9/2019. It aimed at studying the effect of spraying Gibberellic acid (GA3) with three concentrations (10, 20, 30) mg.L-1, the growth regulator Naphthalene acetic acid (NAA) with three concentrations (25, 50, 75) mg.L-1 and zinc sulfate (ZnSO4) with three concentrations (500, 1000, 1500) mg.L-1 on some growth characteristics and crops of pear tree (Pyrus communis) of Le-Cont type. The experiment was carried out in accordance with Randomized Complete Block Design (RCBD) for simple factorial tests with three replicates and one tree per experimental unit. The results were statistically analyzed using the ready-made (SAS V 9.0) program. The averages were compared according to Duncan's Multiple Range Test at probability level (0.05). The results obtained can be summarized as follows: Spraying GA3 with (30) mg.L-1 concentration led to a significant increase in the characteristics of vegetative growth and the crop. The rates of growth length, thickness of vegetative growth, leaf area and the rate of size, length, diameter, the quantity of fruits, the crop of one tree and the total crop were: 25.01 cm, 0.62 cm, 25.80 cm², 78.35 cm³, 7.35 cm, 6.07 cm, 134.26 fruits.tree-1, 10.99 kg.tree-1, 3.66 tons.ha-1, respectively. The concentration level of (75) mg.L-1 of NAA was higher in relation to fruit weight, reaching (82.77) g. [ABSTRACT FROM AUTHOR] |
