University of Kirkuk Kirkuk University Journal for Agricultural Sciences (KUJAS) 2221-0482 12 1 2021 03 01 Effect of Organic Fertilizer levels and Spraying by Gibberellic on growth and yield characterstics of Strawberry Plant Fragaria X ananassa Duch. in Gypsum Soil 47 55 177481 10.58928/ku21.12106 EN Sufian Saleh Hussien Al – Handel Horticulture and Landscape Dep. / College of Agriculture / Tikrit University Nadhim Salim Ghanim Horticulture and Landscape Dep. / College of Agriculture / Tikrit University Journal Article 2020 09 24 The study was carried out in field of horticulture and landscape department / agriculture college / Tikrit university, in agricultural season 2018 – 2019, to study effect of organic fertilizer levels to the soil at a rate 8 m3.donum-1 in three levels is: (control, poultry fertilizer and sheep fertilizer), and spray by Gibberellic acid GA3 in three concentration: (0, 50 and 100) mg.l-1 on some growth and yield characteristics of strawberry plant Fragaria X ananassa Duch. in Gypsum soil. The experiment was designed according to randomize complete block design (RCBD) as factorial experiment with two factors, organic fertilizers and spraying with gibberellic acid in three replicates. The results showed significantly differences in treatments at organic fertilizers levels in all study characters, as for spraying with Gibberellic acid the results showed significantly differences in treatments on (number of leaves, leaf area, plant hight, number of stolons, fruit length, total yield,<br />percentage of total sugar, concentration of anthosyanin in fruit, content of vitamin C) compared with control treatment, The interactions between the two factors of the experiment had a significant effect, treatment of the interference between adding fertilizer for poultry to the soil and spraying with gibberellic acid at a concentration of 100 mg. Liters-1 the highest values in the number of leaves 152.66 leaf.plant-1 and the treatment of the interference between adding fertilizer for sheep to the soil and spraying with gibberellic acid at a concentration of 100 mg. Liters-1 in the area of one leaf area reached 150.97 cm2 compared to the comparison treatment. https://kujas.uokirkuk.edu.iq/article_177481_b53f5b9e1880f33c42f55bca7510855b.pdf