EFFECT OF SEEDING RATE ON GRAIN YIELD AND ITS COMPONENTS OF BREAD WHEAT CULTIVARS

A field experiment was conducted at the field of Crops Science Dept, Coil. of Agric. IJois. of Baghdad,during 20014003 seasons. The objectise was to study the response of grain yield and yield components of bread isheat cultisars to different seeding rates The experiment was carried out, using splititiot design with ten cultis ars (Tamoz 2, Tamoz 3, Abu-Ghraib 3,IPA 95. IPA 99, Sall Al-Rashid, Ahlraq Fates and Rabea) as main plots and four seeding rates ( 80 120, 240 and 320 kg htfl) as sub plots. The highest number of spikes /plant was produced,in the first season from the cs, Fateh and IPA 95. While, in the second season it was from the tv. Alm-Glwalb with 3201 g ha'. The cultivars,WA 99, Tamoz 2, Tamoz 3 and Fateh in the first season and Tamoz 3 in the second season showed higher number of grains/spike, using 80Itg ba4 AT-Iraq cs produced higher 1000 grains weight (43.47 gm) in the first season While, in the second season the enthrall, Al-Iraq,Sali, Al-Rashid and Rabea produced higher grain sleight using 80kg ha,The higher biomass (17108 and 174004 kg ha' were, produced from the combination of Bali and Al-Rashid with 320 kg ba'.The higher harlot index was found from the combination Al-raq X 80kg in both seasons. The highest combination of grain yield (4894 and 4867) and (5306 and 5205)kg ha, were produced from cultivars Fateh and Al-Iraq, with 240kg/ha in the first and second seasons, respectiseR. It was recommended cultivation of Fateh and Al-Iraq cultivars using 240 kg ha' seeding rates