RESPONSE OF GROWTH AND YIELD OF THREE BARLEY CULTIVARS (Hordeum SPP.) TO THE TILLAGE SYSTEMS.

Afield experiment was carried out in growing season (2020-2021) in two locations, The first Al- Hamdaniya ,which far away (15) km southeast of the city center of Mosul and the second in the Namrood location (65) km east of the city center of Mosul , to study growth and yield of three cultivars of barley (Hordeum spp.) response to tillage systems .The experiment was designed according to an experiment system within (split-plot).using a completely randomized block design (R.C.B.D) with three replications . The experiment included two factors, 1- Three cultivars of barley : ( Aswad mahly – zanbaga and Samer ) 2-Three tillage systems , Zero tillage (ZT) , Single plow farming– Two plows with seeding , Conventional tillage(CT) The most important esults could be summarized as follows:1- cultivars differed significantly in studied characters for both locations , Aswad mahly cultivar superior significantly in most characters while Zanbaga surpass in spike length 2-Zero tillage superior in all characters for both locations except the weight of seeds and number of seeds in spike .The two –plows method is superior to the one – plows method in number of seeds in spike and grain yield in the two location While sowing with one plows superior in the number of spikes . 3-The interiaction between cultivars and tillage systems shows superior Aswad mahly with Zero tillage in number of spike .m , grain yield and Aswad mahly with Two plows in number of seed /spike and seed weight in spike in the two location while zanbaga superior in spike length. While the lowest values shows in Samer with one plow. *part of ph . D. Thesis .athesis submitted by the first author.