Influence of three temperature regimes on seed germination of three barley cultivars

Seed germination rate of three barley cultivars (cv.) were studied under three temperature regimes at Laboratories of Faculty of Agriculture, University of Kufa, in the year 2013. The three barley cv. were 1- Arefat 2- Syrian local and 3- Iraqi local. The temperature regimes were 20, 25 and 30 C̊. Seven terms were used to study the germination process of barley seeds in order to determine the ideal evaluation of germination rate and sowing rate. The studied terms were: germination percentage GP, germination vigor GV, germination speed GS, germination index GI, speed of germination coefficient SGC, seeds agriculture value SAV and corrected planting rate CPR. One hundred seeds were used in each experimental unit and germinated seeds were scored at 24 hours intervals. The Arefat cv. obtained the highest germination rate in comparison to other cv., but the highest value was under 25 C̊ condition. It was also found that 80% of the seeds were germinated throughout the first, second, and third accounts. The other terms behaved in similar way. The recommendations can be summarized in which the sowing rate for Arefat and Iraqi local barley cv. is 108 kg.h -1 (27 kg. donam -1), and it is 120 kg .h-1 (30 kg. donam- 1) for the cv. local Syrian. Germination conditions should be provided during the first five days in the best way possible.