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

作者：Barati Vahid^*; Ghadiri Hossein

来源：Archives for Agronomy and Soil Science, 2017, 63(6): 841-855.

DOI：10.1080/03650340.2016.1238075

• Six-rowed barley
• two-rowed barley
• assimilate remobilization

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 120kgha(-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.

• 出版日期2017