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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (6): 327-335.DOI: 10.11686/cyxb20140639

• Orginal Article • Previous Articles     Next Articles

Dry matter production and nitrogen accumulation of rice genotypes with different nitrogen use efficiencies

JI Lin,YANG Huan,LI Ting-xuan,ZHANG Xi-zhou,YU Hai-ying   

  1. College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2013-12-12 Online:2014-12-20 Published:2014-12-20

Abstract: Nitrogen plays an important role in promoting plant growth and development. The purpose of this study was to investigate the characteristics of dry matter production and nitrogen accumulation for rice genotypes with different nitrogen use efficiencies (NUE) and to analyse the relationship between grain yield and NUE. A soil culture pot experiment was carried out at Sichuan Agricultural University, Sichuan province, China in 2009. The grain yield of high NUE genotypes was 1.74-2.37 times higher than that of low NUE genotypes, while NUE of high NUE genotypes was 23.97%-70.55% higher than that of low NUE genotypes. Dry matter weight of high NUE genotypes was significantly higher than that of low NUE genotypes at all growth stages, which were 1.12, 1.49 and 5.85 times higher than that of low NUE genotypes at tillering-to-jointing stage, jointing-to-heading stage and heading-to-maturity stages respectively. The peak dry matter weight of high NUE genotypes occurred at heading-to-maturity stage, while that of low NUE genotypes occurring at tillering-to-jointing stage. Nitrogen accumulation rate of high NUE genotypes increased faster in the early stages, and achieved a maximum 30-50 d after transplanting, then slowed down. Maximum nitrogen accumulation rates of Meigugu, IR31892-100-3-3-3 and IRIT216 were 11.32, 12.36 and 15.83 mg/(d·plant), which were respectively 1.22, 1.33 and 1.70 times higher than Jiazao 935; and, respectively, 1.56, 1.70 and 2.18 times higher than IR32429 with low NUE respectively. High NUE genotypes can maintain higher rates of nitrogen accumulation for longer, with an average duration of 49 d from tillering to heading stages. Low NUE genotypes had a development period 12 d shorter than that of high NUE genotypes. Dry matter weight and nitrogen accumulation at the heading-to-maturity stage were associated, respectively, with 62.65% and 47.42% differernce in rice yield, with 14.51% and 8.77% variation in nitrogen grain production efficiency, and 22.14% and 15.90% variation, respectively, in nitrogen harvest index. In summary, rice dry matter accumulation and nitrogen accumulation were closely related to yield and NUE at the heading-to-maturity stage. Tillering-to-heading is a critical stage for rice nitrogen nutrition management.

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