in order to study the source limitation and contribution of pre-anthesis assimilates to grain in dual-purpose (forage and grain) barley, a field experiment was carried out in iran, ahvaz region. the experimental design was split plot in randomized complete block with three replications. application rates of nitrogen at four levels (60, 120, 180 and 220 kg.ha-1 n) were as main plots, while sub p...

230 Journal of Plant Registrations, Vol 2, No. 3, September 2008 Devastating yield losses occurred in wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) in the western United States within 2 yr after the fi rst appearance of the Russian wheat aphid [RWA; Diuraphis noxia, (Mordvilko)] in 1986 (Porter et al., 1999). Screening of the entire USDA-ARS National Small Grains Collection of H....