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Assimilate and nitrogen remobilization of six-rowed and two-rowed winter barley under drought stress at different nitrogen fertilization

Barati, Vahid, Ghadiri, Hossein
Archiv für Acker- und Pflanzenbau und Bodenkunde 2017 v.63 no.6 pp. 841-855
cultivars, fertilizer application, field experimentation, grain yield, irrigation rates, nitrogen, nitrogen content, nitrogen fertilizers, water stress, winter barley
Field experiments were conducted to investigate the effects of irrigation regimes and N levels on assimilate remobilization of two barley cultivars (Yousef ₛᵢₓ₋ᵣₒwₑd and Nimrouz ₜwₒ₋ᵣₒwₑd) in 2011 and 2012. There were three levels of water regimes (full irrigation (I ₁₀₀), 75% and 50% of I ₁₀₀: I ₇₅ and I ₅₀, respectively) in 2011. Rain-fed treatment (I ₀) was included in 2012. Three N levels (0, 60, and 120 kg ha ⁻¹) were used. Grain yield and assimilate remobilization decreased by severe water stress (I ₀), however, the reduction of them were intensified by N fertilizer application. The N remobilization was negatively affected by N fertilization and water stress. The two-rowed showed higher N remobilization (10.7%) and contribution of N remobilized to N content of grain (5.8%) than the six-rowed. The two-rowed cultivar showed significantly higher assimilate remobilization and grain yield than the six-rowed under I ₅₀ (26.3% and 6.5%, respectively) and I ₀ (48.7% and 17.1%, respectively), while the six-rowed had similar or higher performances in terms of these traits under I ₁₀₀ and I ₇₅. This study showed that optimizing irrigation and N rates (decrease N level with increasing water stress) and selection of the suitable cultivars (Nimrouz ₜwₒ₋ᵣₒwₑd) might increase assimilate remobilization and consequently grain yield under drought stress conditions.