Effect of Foliar Application of Boron on Growth Yield and Yield Components of Four Varieties of Oats Avena sativa L.

field experiments was carried out at a farm located in Al- Bathaa region 20 km west province of Dhi Qar, 350 km south of the capital Baghdad, during two winter seasons 2014-2015 and 2015-2016 .The experiment was designed to study the effect of the Boron concentration on the characteristics of the growth and yield for four varieties of Oats. experiment was layout using R.C.B.D. arranged in split – plot with three replications. In experiment varieties (Shifaa , Carrolup , Genzania and Alguda ) were using as a main plots, while while Boron concentration (0 , 75 , 150 and 225 ) mg L-1 were assigned as sub-plots. In each season the following traits were studied :- Number panicles m-2 , Number of grains. panicle-1 , 1000 grain weight , Grain yield , Biological yield and harvest index . The data obtained was analyzed according to analysis of variance methods. Means were compared using L.S.D. test at 5 % level and the results could be summarized foliar application of boron at different concentration significantly influenced on most of grain yield components , grain yield , biological yield and harvest index .Since high concentration of boron gave highest grain yield amounted to 9.8 ton ha-1 and 12.63 ton ha-1 for first and second season respectively. Also there were significant differences between varieties in growth traits grain yield components , grain yield , biological yield and harvest index. Since variety Carrolup gave highest grain yield in first season amounted to 9.22 ton ha-1 , while in second season variety Shifaa gave highest grain yield amounted to 12.38 ton ha-1 . Results showed , that there were significant interaction between varieties and boron concentrations on all traits.