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Agronomy Journal Abstract -

Seed Rate and Row Spacing of No-Till Winter Wheat


This article in AJ

  1. Vol. 83 No. 4, p. 684-689
    Received: July 9, 1990

    * Corresponding author(s):
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  1. D. K. Tompkins,
  2. G. E. Hultgreen,
  3. A. T. Wright and
  4. D. B. Fowler 
  1. O lds College, Olds, AB., TOM 1P0, Canada
    S askatchewan Wheat Pool Product Development Branch, Box 670, Watrous, SK, SOK 4T0,, Canada
    A griculture Canada Res. St., P.O. Box 1240, Melfort, SK, SOE 1A0, Canada
    C rop Development Centre, Univ. of Saskatchewan, Saskatoon, SK, S7N OWO, Canada



A snow management system, which utilizes no-till seeding into standing stubble immediately after harvest of the previous crop, has permitted the expansion of winter wheat (Triticum aestivum L.) production in western Canada. The effect of seed rate and row spacing on grain yield and yield oomponents of no-till winter wheat were evaluated in 21 trials conducted in Saskatchewan from 1986 to 1988. Two winter wheat cultivars were evaluated in eight of the trials. The relationship between grain yield (Y) and seed rate was best described by a modified inverse polynomial: Y = uSR(l-SR/566)/(SR + u/104) where u represents the upper limit of yield when seed rate is not limiting. This curve accounted for 98% of the observed variation in grain yield. Optimum seed rate varied from 58 kg ha−1 at a very dry trial to 148 kg hn−1 in a trial with more favorable growing conditions. Grain yield inaeased as row spacing decreased and the effect of row spacing on pain yield was increased under more favorable growing conditions. Increased seed rate and decreased row spacing interacted positively to increase grain yield so optimum seed rate increased as row spacing decreased. Increased spikes per square meter was responsible for the increase in grain yield associated with high seed rate and narrow row spacing. In contrast, kernel weights were slightly higher with low seed rate and kernels per spike were higher with low seed rate and wide row spacing. Optimum seed rate was higher for the cultivar ‘Norstar’ than for ‘Norwin’ due to higher yield potential of Norstar under the conditions experienced in this study.

Supported in part by a grant from the Canada-Saskatchewan Economic Regional Development Agreement

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