RESPONSE OF THREE CULTIVARS OF OATS (AVENA SATIVA L.) TO HUMIC ACID AND ITS EFFECT ON YIELD AND ITS COMPONENTS

A field experiment was conducted during the winter season (2019-2020) in Babylon province - Al-Badaa area in a farmer's field, which is 20 km west of the province center within 32.52 degrees north latitude and 44.55 degrees east longitude for the purpose of studying the effect of the cultivar and spraying with humic acid on the growth and productivity of oats. The experiment was conducted by following the of randomized complete blocks design (RCBD) within the global experiment with three replications to know the effect of two factors: The first factor: It includes three varieties of oats, Avena sativa L. (Shifa, Ganzania and Karlop), The second factor: It included two concentrations of humic acid (2 and 4 g.L-1). As well as the control treatment that was sprayed with distilled water only and the averages were tested according to the least significant difference test at the probability level of 0.05. It was obtained in the experiment that the spraying at a concentration of 4.0 g.L-1 of humic acid was significantly excelled by giving the highest averages in all the yield indicators. The Ganzania cultivar was significantly excelled by giving the highest averages in most of the yield indicators (Number of panicles, number of grains in panicles, grain yield and harvest index). The results also showed a significant effect of the values of the bi-interaction between the study factors in most of the studied traits. The combination of Ganzania cultivar with spraying concentration of 4.0 g.L-1 gave the highest averages in most of the yield indicators.