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Acta Agron Sin ›› 2008, Vol. 34 ›› Issue (04): 718-723.doi: 10.3724/SP.J.1006.2008.00718

• RESEARCH NOTES • Previous Articles     Next Articles

Carbon and Nitrogen Metabolism and Nitrogen Use Efficiency in Summer Maize under Different Planting Densities

LÜ Li-Hua1,TAO Hong-Bin1,WANG Pu1*,LIU Ming1,ZHAO Ming2,WANG Run-Zheng3   

  1. 1 Key Laboratory of Crop Cultivation and Farming System, Ministry of Agriculture / College of Agronomy and Biotechnology, China Agricultural
    University, Beijing 100094; 2 Institute of Crop Sciences, Chinese Academy of Agricultural Science, Beijing 100081; 3 Wuqiao Experimental Station,
    China Agricultural University, Wuqiao 061800, Hebei, China
  • Received:2007-08-13 Revised:1900-01-01 Online:2008-04-12 Published:2008-04-12
  • Contact: WANG Pu

Abstract: We conducted a field experiment to obtain high yield and high recovery of N fertilizer simultaneously through regulating carbon and nitrogen metabolism under suitable planting density in 2006. The main results showed that plants grew well under low or medium densities [9.75×104 (D1-1) and 11.25×104 (D1-2) plants ha-1 for CF008; 8.25×104 (D2-1) and 9.75×104 (D2-2) plants ha-1 for Zhengdan 958; and 6.75×104 (D3-1) and 8.25×104 (D3-2) plants ha-1 for Jinhai 5]. Although C and N accumulation in stem/sheath and leaf at silking stage and C and N translocation rate were higher under medium or high density than under low density, grain yield, N uptake efficiency, N use efficiency, and recovery of N fertilizer were significantly higher under low or medium densities. N accumulation in shoots before silking was higher under medium or high density than under low density, N in shoot accumulation at maturity and N in grain were higher under low or medium density. Hence N accumulation in shoot after silking stage was important for grain N accumulation. We also obtained some quantitative criteria based on the research in Wuqiao area: for the three varieties of maize, grain yield was 10 262–11 461 kg ha-1, recovery of N fertilizer was 23.00%–34.11% under low or medium densities.

Key words: Summer maize (Zea mays L.), Density, Metabolism of carbon and nitrogen, C/N ratio, Recovery of N fertilizer

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