Chin J Plan Ecolo ›› 2012, Vol. 36 ›› Issue (10): 1075-1081.doi: 10.3724/SP.J.1258.2012.01075

• Research Articles • Previous Articles     Next Articles

Effects of excessive nitrogen supply on productivity of winter wheat

ZHAO Feng-Hua, MA Jun-Hua, and OUYANG Zhu*   

  1. Key Laboratory of Ecosystem Network Observation and Modeling, Chinese Academy of Sciences, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101
  • Received:2012-04-06 Revised:2012-06-26 Online:2012-09-26 Published:2012-10-01
  • Contact: OUYANG Zhu E-mail:ouyz@igsnrr.ac.cn

Abstract:

Aims Integrated research on the effect of N supply on successive levels from leaf to canopy would be helpful to improve the field N management in winter wheat production areas in China.
Methods Field experiments were conducted under 5 N levels: 0, 70, 140, 210 and 280 kg N·hm–2. Four levels of productivity were measured: leaf photosynthetic rate (Aleaf) and canopy photosynthetic rate (Acanopy) measured at the stages of booting, flowering and grain-filling, crop growth rate (CGR) measured during the stages of setting-flowering and flowering-ripening and grain yield (GY) measured at the stage of harvesting.
Important findings Results show that Aleaf, Acanopy and CGR have increasing patterns at all stages when N supply increases from 0 to 210 kg N·hm–2. When N supply increases from 210 to 280 kg N·hm–2, GY has no significant variation; however, the Aleaf and Acanopy during the grain-filling stage and the CGR during the flowering-ripening stage decrease. These results indicate that: 1) excessive N supply of 280 kg N·hm–2 can decrease the productivity of winter wheat over leaf, canopy and biomass levels and inhibit GY increasing; 2) the negative effect of excessive N supply is readily demonstrated during the stage of grain-filling; and 3) Acanopy is more capable of detecting the negative effect of excessive N supply than Aleaf, CGR and GY.

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