ABSTRACT
The present study involved the applications of silver nano particles (AgNPs) to improve the yield of oat varieties under dry land conditions at two ecosystems, Kirkuk, Altun kopru and Erbil, Koya. A field experiment was implemented in the winter season of 2020 according to the randomized complete block design in a split-split plot arrangement. The experiment consisted three factors; the first factor consisting two locations Altun Kopru/Kirkuk and Koya/Erbil and the second factor consisting (0,10,20,30 and 40 ppm AgNPs) ; while the third factor consisting eight Oat varieties; (Pimula, Genzania, Hamel, Icarda short , Icarda tall, Kangaroo, Mitika and Possum). The results showed significant superiority of Nano silver spray in achieving the highest means for most studied indicators. Spraying of 30 ppm AgNPs achieved the highest means for plant height, tillers and panicles number ,grains yield, straw yield, biological yield except of panicle grains weight and harvest index. which the both achieved the highest means at 0 ppm. The Mitika variety recorded the lowest grain yield, straw yield, biological yield and the highest harvest index. The Hamel variety was superior in grain yield, straw yield, and biological yield. The Icarda short - variety recorded the highest grain yield and biological yield. while Possum and Pimula recorded the highest grain and Straw yield. In Koya location grains yield, biological yield and harvest index showed the significant superiority with Altun kupro location. All cultivars caused a significant increase in grain, straw and biological yield with the concentration increase of Nano silver spray from 0 to 30 ppm.