This experiment was conducted in Al-Muthanna University research station during the winter season 2014 –2015, to study the effect of four levels of nitrogen (0, 60, 120, 180 kg N. h-1), and three rates (100 ,120 ,140 kg h-1), of oat (Avena sativa L.). Experimental design was spilt plot within Randomized Complete Block Design (RCBD). 180 kg N h-1 was superior over others in yield of panicles.m-2, biological yield (439.0 panicle. m-2, 26.73 ton.h-1, respectively). 120 kg N h-1 significantly came next, since it substantially increased number of grains.panicle-1, seeds yield (73.76 grain. Panicle-1, and 4.732 ton h-1, respectively). 140 kg seeds h-1 gave the highest panicles.m-2, number of grains.panicle-1, biological yield and seeds yield (411.8 panicle m-2, 71.52 grain/ panicle , 4.74 ton. h-1, 27.43 ton. h-1, respectively). 120 kg h-1 treatment significantly increased 1000 grain (40.07 g). The interactions between fertilizer levels and sowing rates significantly influenced all detected traits
Asmaa Sahib Al-Husnawy, Agric. College, AlMuthanna Univ.
Shaymaa Ibrahim Al refai, Agric. College, AlMuthanna Univ