Hizrat Mohammed Qasim; Yousif H. Hammo
Volume 24, Issue 1 , March 2024, , Pages 34-44
Abstract
This study was conducted during the period between 23th September 2021 to 1st July 2022, in the nursery of Duhok University, Kurdistan region, Iraq. Aiming to evaluate effect of the Shade (0 and 50) %, Gibberellic acid (0, 250, and 500) mg.l-1 and three levels of NPK fertilizer control (0, 0, 0), low ...
Read More
This study was conducted during the period between 23th September 2021 to 1st July 2022, in the nursery of Duhok University, Kurdistan region, Iraq. Aiming to evaluate effect of the Shade (0 and 50) %, Gibberellic acid (0, 250, and 500) mg.l-1 and three levels of NPK fertilizer control (0, 0, 0), low (150, 100, 75), and high (300,200,150) mg.l-1 on the growth and development for Myrtle (Myrtus communis) plants. This experiment was performed by use randomized complete block design (RCBD). The best results include the following: 50% shade significantly increased the plant height (36.21) cm, leaf area (4.41) cm2, total chlorophyll (57.41) spad, vegetative dry weight (14.62) gm, plant growth index (9230) cm3 and number of premier tricussate shoots (14.37) branch/plant compared with 0%. spray with 500 mg.l-1 GA3 significantly increased plant height (35.58) cm, number of branches, leaf area (2.84) cm2, total chlorophyll (57.28) spad, dry weight (13.67) gm, plant growth index (8098) cm3, number of premier tricussate shoots (14.37) branch/plant. Also used NPK fertilizer caused significantly increase in all these traits, the best interaction treatment among the three factors include 50% shade with 500 mg.l-1 GA3 and (300,200,150) mg.l-1 NPK that gave the highest significant values for the plant height (43.53) cm, leaf area (4.53) cm2, total chlorophyll (64.57) spad, vegetative dry weight (20.27) gm, plant growth index (15580) cm3 and number of premier tricussate shoots (20.67) branch/plant compared with control (0 shade, 0 GA3, (0,0, 0) mg.l-1) .
Abdullah Mohammed; Brian Baldwin
Volume 23, Issue 2 , June 2023, , Pages 190-200
Abstract
An experiment was carried out in a laboratory of the Field Crops Department/College of Agriculture/Tikrit University to study the effect of treating the seeds of five barley varieties (Samir, Amil, Aksad, Alkhayr, Shueae) with four concentrations (0, 50, 100, and 150 mg L-1) of gibberellic acid on percentage ...
Read More
An experiment was carried out in a laboratory of the Field Crops Department/College of Agriculture/Tikrit University to study the effect of treating the seeds of five barley varieties (Samir, Amil, Aksad, Alkhayr, Shueae) with four concentrations (0, 50, 100, and 150 mg L-1) of gibberellic acid on percentage of seed germination, germination vigor, germination speed, shoot length, root length, and total dry weight. The experiment was carried out using a completely randomized design (C.R.D.) with four replicates (Petri dish) for each treatment. The results showed that there were significant differences among the concentrations of gibberellic acid and among the varieties in affecting all the studied traits. Seeds treated with a concentration of (100 mg L-1) of gibberellic acid was superior in all studied traits. Aksad variety was superior to all cultivars in most of the studied traits, which are germination percentage (98.17%), germination vigor (61.83%), germination speed (50.20), and total dry weight (0.04078 g plant-1), while Samir and Shueae were superior in shoot length (19.42 and 19.38 cm), respectively and Samir was superior in the root length (12.79 cm). There was also a significant interaction between cultivars and gibberellic acid concentrations for all studied traits. The interaction of (Samir x 100) was superior to all combinations for all studied traits except dry weight trait, which the interaction (Aksad x 100) was superior.
