Scientia Agricultura Sinica ›› 2008, Vol. 41 ›› Issue (2): 470-479 .doi: 10.3864/j.issn.0578-1752.2008.02.021

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Effect of Real-time and Site-specific Nitrogen Management on Various Hybrid Rice

Fan He Kehui Cui Qiang Wang   

  1. 华中农业大学作物生理生态与栽培研究中心
  • Received:2007-05-11 Revised:2007-07-02 Online:2008-02-10 Published:2008-02-10

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Abstract: Site-specific N management (SSNM) and real-time N management (RTNM) improves fertilizer-N use efficiency of irrigated rice. This study was conducted to compare the most popular hybrid varieties, three-line hybrid rice-Shanyou63 (SY63) and two-line hybrid rice-Liangyoupei9 (LYP9), in their response to N application and fertilizer-N use efficiency under RTNM and SSNM in field conditions in 2004 and 2005. 【Method】The two varieties were grown under eight and six N treatments in 2004 and 2005, respectively, in Hubei, China. N treatments included a zero-N control, a SSNM and several RTNM with different chlorophyll meter (SPAD) thresholds. 【Result】The results showed that, color of rice leaves had genotypic difference between varieties, the SPAD reading of SY63 had 1.7-2.0 units lower than that of LYP9 while both varieties were under zero or the same fertilizer-N rates. The fertilizer-N rate showed significant exponential correlation with the SPAD threshold based on RTNM for both varieties. The equations for SY63 and LYP9 were, N rate=0.9956 e0.132 SPAD (r2=0.8338**), and N rate=0.1565 e0.173 SPAD (r2=0.9508**), respectively. It was found that, additional fertilizer-N 37.3 kgN.hm-2 was required for SY63 to maintain the same SPAD value in comparison with that of LYP9, when SPAD thresholds were among 36-40 under RTNM. 【Conclusion】When average fertilizer-N rate was around 160 kgN.hm-2, LYP9 showed similar capacity and characteristics on N uptake, N recovery use efficiency, and nitrogen use efficiency based on grain production, in comparison with that of SY63. But LYP9 had greater nitrogen use efficiency based on biomass production, fertilizer-N agronomic use efficiency, in comparison that of SY63 respectively. However, SY63 had greater nitrogen harvest index than that of LYP9. The results also showed that, LYP9 had greater tolerance against lodging than that of SY63 when excessive fertilizer-N applied.

Key words: Hybrid rice, Real-time nitrogen management and site-specific nitrogen management, Nitrogen use efficiency (NUE)

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