Nitrogen-Reducing and Suitable Soil Moisture Enhance Photosynthetic Potential of Flag Leaf and Grain Yield in Winter Wheat

【Author】

ZHOU Su-Mei;ZHANG Ke-Ke;ZHANG Man;LI Lei;ZHANG Chun-Li;YIN Jun;HE De-Xian

【Institution】

College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops;College of Agronomy,Henan Agricultural University/National Engineering Research Centre for Wheat/Collaborative Innovation Center of Henan Grain Crops

【Abstract】

This study aimed at seeking a possibility of reducing nitrogen (N) fertilizer input on getting high yield in wheat ( Triticum aestivum L.) production in Huang-Huai Rivers Valley region. A field experiment was carried out with treatments of three soil moistures and three N application levels, to measure light-response curve parameters of flag leaf, water use efficiency and yield-component traits in the 2013–2014 and 2014–2015 growing seasons. The soil moisture treatments included no irrigation (W1), medium irrigation to 70% ± 5% of soil relative moisture after jointing stage (W2), and well-irrigation to 80% ± 5% of soil relative moisture after jointing stage (W3). The N application rates were 0 (N1), 195 (N2), and 270 kg hm ?2 (N3). Under W1 and W2 conditions, N2 treatment showed greater increases in net photosynthetic rate (P n), stomatal conductance (G s), and transpiration rate (T r) of flag leaf and greater reduction rate of intercellular CO 2 concentration (C i) than N1 and N3 treatments. Under W3 treatments, N2 and N3 treatments had similar changing trend of light response curves. N2W2 was the most superior treatment in photosynthesis at anthesis stage, with the maximum P n of 33.20 μmol CO 2 m ?2 s ?1 and the light saturation point (LSP) of 1,507.4 μmol m ?2 s ?1, which were 21.4% and 9.5% higher than these averages of other treatments, respectively. In addition, N2W2 showed the lowest light compensation point, indicating its high photosynthetic potential. As a result, N2W2 had the largest kernal number and the highest thousand-grain weight across two years, with significant difference than other treatments ( P<0.01). The grain yield of N2W2 was more than 9,500 kg hm ?2, and the water use efficiency was 18.8% higher than that of other treatments under W2 and W3 conditions. These results suggest that reducing N application from 270 to 195 kg hm ?2 under suitable soil mois-ture (medium irrigation) may increase wheat yield by enhancing the photosynthetic potential of flag leaf, which is a good management of irrigation and fertilizer for high yield and high N use efficiency in Huang-Huai Rivers Valley wheat region.

【Keywords】

Nitrogen-reducing and suitable soil moisture;Winter wheat;Flag leaves;Light-response curves;Grain yield

References

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Total: 24 articles

  • [1] YANG Qing 1, LI Yan-ming 1, XIAO Kai 1,DU Yan-hua 2 (1.College of Agronomy , Agricultural University of Hebei,Baoding 071001,China; 2.Handan Agricultural College,Yongnian 057150,China), Effect of different amount of nitrogen on flag leaf senescence and yield components of wheat, Journal of Agricultural University of Hebei,
  • [2] Lu Peiling (Beijing Forestry University,Beijing 100083) Luo Yi Liu Jiandong Yu Qiang (Yucheng Comprehensive Experimental Station,Institute of Geography,Chinese Academy of Sciences,Beijing 100101), CHARACTERISTIC PARAMETERS OF LIGHT RESPONSE CURVES OF PHOTOSYNTHESIS OF WINTER WHEAT IN NORTH CHINA, QUARTERLY JOURNAL OF APPLIED METEORLOLGY,
  • [3] Huang-Huai-Hai Area of China Wang Zhimin, Wang Pu, Lan Linwang,Zhou Dianxi (Couege of Agri and Bioscience and Technology China Agricultural University, Beijing 100094), A Water-Saving and High-Yielding Cultivation System for Bread Wheat in, Chinese Agricultural Science Bulletin,
  • [4] WANG Xiao-feng1,WU Wen-liang1,PAN Zhi-yong1,CHEN Shu-feng1,LIU Guang-dong1,XIA Xun-feng 2 (1.College of Resources and Environmental Sciences,China Agricultural University,Beijing 100094,China;2.Chinese Research Academy of Environmental Sciences,Beijing 100012,China), Effects of Various Water and Nitrogen Managements on Growth of Winter Wheat and Water Use Efficiency, Journal of Agro-Environment Science,

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