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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.