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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (06): 1097-1106.doi: 10.3724/SP.J.1006.2012.01097

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Nitrogen Fertilizer Management on Yield and Nitrogen Use Efficiency of Eryou 498 in Triangle-Planted System of Rice Intensification

YANG Zhi-Yuan1,HU Rong1,2,SUN Yong-Jian1,XU Hui1,XU Yuan-Ming3,MA Jun1,*   

  1. 1 Rice Research Institute of Sichuan Agricultural University / Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Wenjiang 611130, China; 2 Fine Varieties Breeding Center of Sichuan, Chengdu 610200, China; 3 Dongpo Agricultural Bureau, Meishan 620032, China
  • Received:2011-12-28 Revised:2012-02-22 Online:2012-06-12 Published:2012-03-29
  • Contact: 马均, E-mail: majunp2002@163.com E-mail:dreamislasting@163.com

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Abstract: Hybrid rice Eryou 498 was used to investigate the effects of nitrogen (N) fertilizer management on leaf area, photosynthetic rate in productive phase, and also dry-matter accumulation and its transportation in triangle-planted system of rice intensification (TSRI) with appropriate seedling age and density. At the same time, the effects of dry-matter accumulation before anthesis and its transportation and dry-matter accumulation after anthesis on yield formation were also studied to explore a N fertilizer management which could both increase yield and reduce the waste of N. The results showed that in TSRI N fertilizer management had significant effects on leaf area index (LAI) and photosynthetic rate except the LAI in waxy ripening stage; with the increase of N rate and postponing N application, net photosynthetic rate in flag leaf in full heading stage and waxy ripe stage increased significantly; LAI in productive phase exhibited a parabola mostly with the increase of N rate and postponing N application. In TSRI, N rate and ratio of application both enlarged total glumes to increase yield. At the same time, N rate enlarged 1000-grain weight and ratio of application improved seed-setting rate to increase yield respectively. In TSRI, dry-matter accumulation before anthesis, dry-matter of transportation, and transportation rate of dry-matter had significantly positive correlation with yield respectively. The treatment which N rate was 150 kg ha-1 and panicle fertilizer was 30% of the whole N fertilizer enlarged dry-matter accumulation before anthesis and dry-matter of transportation significantly to reach maximum yield. It also improved N agronomy efficiency and N physiology efficiency significantly, so it was the best combination which could both increase yield and reduce the waste of N fertilizer to the maximum degree.

Key words: Rice, Triangle-planted system of rice intensification (TSRI), N rate, N fertilizer management, N use efficiency

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