Nitrogen and cultivated bulb weight effects on radiation and nitrogen-use efficiency, carbon partitioning and production of Persian shallot (Allium altissimum Regel.)

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• 作者：Ehsan Eyshi Rezaei (1)
  Mohammad Kafi (1)
  Mohammad Bannayan (1)
  
• 关键词：agronomic characteristics ; allocation ; growth analysis ; Persian shallot ; plant production
• 刊名：Journal of Crop Science and Biotechnology
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：16
• 期：3
• 页码：237-244
• 全文大小：
• 作者单位：Ehsan Eyshi Rezaei (1)
  Mohammad Kafi (1)
  Mohammad Bannayan (1)
  
  1. Faculty of Agriculture, Ferdowsi University of Mashhad, P.O. Box 91775-1163, Mashhad, Iran
  
• ISSN：2005-8276

文摘

Persian shallot (Allium altissimum Regel.) was grown under fully irrigated conditions in a 2-year-field experiment (2010012) in the northeast of Iran to study and determine (i) radiation and nitrogen-use efficiency, (ii) growth analysis, (iii) carbon partitioning, and (iv) biomass production under different rates of nitrogen and cultivated bulb weights. The field experiment was performed as a randomized complete block design with a factorial arrangement of four nitrogen levels (control (100), 200, 250, and 300 kg ha1) and two levels of cultivated bulb weight (100 and 200 g) with three replications in both years of the experiment. Our results showed that increasing the nitrogen rate and bulb weight significantly enhanced Persian shallot production. Radiation-use efficiency (1.06 to 1.27 g MJ1), maximum crop growth rate (8.3 to 11.2 g m2 d1), and maximum leaf area index (1.3 to 2.6) showed a positive correlation with nitrogen rate and bulb weight. Nevertheless, nitrogen-use efficiency (0.87 to 2.38 g bulb per g nitrogen) indicated a negative relationship with applied nitrogen rate. Moreover, increasing the nitrogen application rate increased the carbon allocation to above-ground organs. On the other hand, nitrogen limited conditions increased the carbon allocation to underground organs and carbon remobilization from stem and leaves to bulbs during the late growth season. Increasing the nitrogen application rate and bulb weight may be appropriate practices for enhancing Persian shallot production; however, evaluation of the impact of nitrogen on the quality of bulbs needs to be investigated.