Abstract

An experiment was carried out at College of Agricultural Engineering Sciences, University of Baghdad, Iraq during the spring season of 2019 to investigate the effects of foliar application of ascorbic acid at three concentrations C1 (0 ppm), C2 (250 ppm) and C3 (500 ppm) along with three levels of the synthetic bio-stimulant atonik A1 (0 ml/l), A2 (0.5 ml/l) and A3 (1 ml/l) on growth and productivity of potato var. Arizona. The experiment was applied according to randomized complete block design (RCBD). The results showed that treatment A2C2 was superior in plant yield, tuber weight, chlorophyll P% and K% (1.12 kg, 154.50 g, 178.20 mg/100 g fw, 0.70 and 3.28%, respectively). While the characteristics like tuber number per plant, plant height, wet weight and dry weight were high in A1C0 (11.17, 71.70 cm, 405.00 g and 62.00 g, respectively). While the treatments A0C0, A0C1, A1C2, A2C0 and A2C1 had higher values to branch number (3.67), N% (2.13), leaf area (46.00 dcm²), secondary branches number (3.67) and leaf number (14.00), respectively.