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The impact of post-anthesis nitrogen and water availability on yield formation of winter wheat

Author

Listed:
  • A. Madani

    (Gonabad Branch, Islamic Azad University, Gonabad, Iran)

  • A.H. Makarem

    (Varamin-Pishva, Islamic Azad University, Varamin, Iran)

  • F. Vazin

    (Gonabad Branch, Islamic Azad University, Gonabad, Iran)

  • M. Joudi

    (Agriculture Faculty, University of Mohaghegh Ardabili, Moghan, Iran)

Abstract

The effects of irrigation regimes (full irrigation and water-withholding at anthesis) and post-anthesis nitrogen supplies (LN: 0, MN: 20 and HN: 40 kg N/ha) on grain yield and its components in winter wheat were studied, with attention to biomass gain by assimilation and its loss by respiration. Fully-irrigated wheat responded to N fertilization with increased grain number (GN) and decreased grain weight (GW) and achieved similar grain yields (5.2 to 5.5 t/ha) at different N supplies. However, drought-stressed wheat responded to N with higher GN without significant changes in GW, and achieved higher grain yields (2.7 vs. 3.3 t/ha) with HN compared to LN. Net assimilation rates during grain filling (NARg) increased with increasing post-anthesis N fertilization for drought-stressed wheat (NARg: 3.8 and 4.5 g/m/day for LN and HN). Apparent whole-plant respiration (RA) was not influenced by increased post-anthesis N fertilizer. Thus, in drought-stressed wheat, the total biomass and straw yield at maturity were increased by increasing N supply. These results suggest that high N supply at anthesis satisfied the grains' increased demand for N by increasing post-floral assimilation, and the surplus assimilates not only compensated for the low-N-induced biomass loss by respiration but may also have increased the

Suggested Citation

  • A. Madani & A.H. Makarem & F. Vazin & M. Joudi, 2012. "The impact of post-anthesis nitrogen and water availability on yield formation of winter wheat," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(1), pages 9-14.
    • Handle: RePEc:caa:jnlpse:v:58:y:2012:i:1:id:299-2011-pse
    DOI: 10.17221/299/2011-PSE
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    References listed on IDEAS

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    1. D. Liu & X. Wang & Z. Chen & H. Xu & Y. Wang, 2010. "Influence of mercury on chlorophyll content in winter wheat and mercury bioaccumulation," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 56(3), pages 139-143.
    2. A. Madani & A. Shirani-Rad & A. Pazoki & G. Nourmohammadi & R. Zarghami & A. Mokhtassi-Bidgoli, 2010. "The impact of source or sink limitations on yield formation of winter wheat (Triticum aestivum L.) due to post-anthesis water and nitrogen deficiencies," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 56(5), pages 218-227.
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    Cited by:

    1. Z.M. Dai & T.S. Xu & X.G. Li & H. Zhang & Y. Li & X.L. Zhang, 2016. "Effect of different water supply on accumulation of high molecular weight glutenin subunits and glutenin macropolymers in near-isogenic wheat lines," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 62(2), pages 53-59.
    2. B. Varga & E. Varga-László & S. Bencze & K. Balla & O. Veisz, 2013. "Water use of winter cereals under well-watered and drought-stressed conditions," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(4), pages 150-155.

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