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Agronomy Journal Abstract -

Agronomic Response of Winter Rapeseed to Rate and Date of Seeding


This article in AJ

  1. Vol. 89 No. 3, p. 521-526

    * Corresponding author(s): sguy@uidaho.edu
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  1. Mary K. Moore and
  2. Stephen O. Guy 
  1. Dep. of Plant, Soil and Entomological Science, Univ. of Idaho, Moscow, ID 83844-2339.



In northern Idaho, winter rapeseed (Brassica napus L.) usually is seeded on summer fallow in early to mid-August at 4.5 to 13.5 kg seed ha−1. A 2-yr study was conducted at Moscow, ID, to quantify crop performance as influenced by date of seeding and seeding rate. In the 1991–1992 and 1992–1993 growing seasons, high-erucic-acid winter rapeseed cultivars, ‘Dwarf Essex’ and ‘Bridger’, were seeded on four dates at 2-wk intervals from early August to mid-September at four seeding rates from 0.9 to 2.7 × 106 seeds ha−1. Greatest yield for the four dates ranged from 1974 to 2675 kg ha−1. Optimum spring plant stands for attaining those yields were between 61 and 112 plants m−2, obtained at different seeding rates, depending on the date of seeding. The lowest seeding rates (0.9 and 1.5 × 106 seeds ha−1) produced optimum spring plant stands for the mid-August and early September seeding. Higher seeding rates in early August and mid-September were necessary to achieve optimum spring plant stands.

Research supported in part by Federal Hatch Project no. H-1042. Published with approval of the Agric. Exp. Stn., Univ. of Idaho, as Journal Article no. 95730.

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