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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (1): 124-131.doi: 10.3724/SP.J.1006.2009.00124

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Plant Density and Seeding Date on Accumulation and Translocation of Dry Matter and Nitrogen in winter Wheat Cultivar Lankao Aizao 8

QU Hui-Juan1,2,LI Jin-Cai1,2,*,SHEN Xue-Shan1,2,WEI Feng-Zhen1,WANG Cheng-Yu1,ZHI Sheng-Jun2   

  1. 1Agronomy College, Anhui Agricultural University,Hefei 230036,China; 2 Nation Engineer Technology Research Center of Wheat,Henan Agricultural University,Zhengzhou 450002, China
  • Received:2008-05-08 Revised:2008-07-04 Online:2009-01-12 Published:2008-11-18
  • Contact: LI Jin-Cai E-mail:ljc5122423@126.com

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Abstract:

Moderately late seeding has the advantage to alleviate damage by low temperature before overwintering in wheat (Triticum aestivum L.). The disadvantage of tillering reduction caused by late seeding may be compensated by increasing plant density. The optimal combination of seeding date and density differs from cultivars or cultivar types. The objectives of this study were to investigate the effects of plant density and seeding date on the accumulation and transportation of dry matter and nitrogen of large-spike type winter wheat cultivar “Lankao Aizao 8”, accordingly to provide a theoretical basis on appropriate density in production with late seeding. Three densities (150, 225, and 300´104 plants ha-1) and two seeding dates (normal and late) were designed for the field experiment in 2005–2007. The accumulation of dry matter and nitrogen per stem in different organs increased at anthesis and maturity with the decrease of plant density. Under the late seeding condition, medium and low densities positively influenced the accumulation of dry matter and nitrogen per stem, especially in spike. The translocation amount of dry matter stored in vegetative organs before anthesis was significantly higher in treatments of low density with normal seeding date and medium density with late seeding date compared with other treatments. Meanwhile, the two treatments showed significantly larger contributions of dry matter to grains. In regard to grain yield and quality, treatments of medium and low densities with normal seeding date and medium and high densities with late seeding date had significantly positive effects on the contents and yields of starch and protein as well as grain yields. In the areas with the condition similar to this experiment, when considering both yield and grain quality, Lankao Aizao 8 is suggested with the densities of 150–225×104 ha-1 for normal seeding and 225–300×104 ha-1 for moderatively late seeding, respectively.

Key words: Plant density, Seeding date, Large-spike type, Accumulation and translocation of dry matter, Accumulation and translocation of nitrogen

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