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Agronomy Journal Abstract -

Planting Date in Relation to Yield and Yield Components of Wheat in the Middle Atlantic Region


This article in AJ

  1. Vol. 80 No. 1, p. 30-34
    Received: Mar 10, 1986

    * Corresponding author(s):
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  1. T. R. Rocheford,
  2. D. J. Sammons  and
  3. P. S. Baenziger
  1. U SDA-ARS Plant Stress and Protection Res. Unit, Univ. of Florida, Gainesville, FL 32611
    D ep. of Agronomy, Univ. of Maryland, College Park, MD 20742
    D ep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583



A 2-yr study was conducted to assess the effects of early and late planting on six soft red winter wheat (Triticum aestivum L.) cultivars. The purpose was to determine if increased flexibility in planting date is possible for modern wheat cultivars grown in the Middle Atlantic states. Wheat was planted 2 wk prior to, on, and 2 wk after the recommended fly-free planting date at Clarksville (Piedmont Province) and Queenstown (Coastal Plain Province), MD. Grain yield and yield components (spikes per square meter, kernels per spike, and kernel weight) were measured. Planting date × location, and planting date × location × year interactions for grain yield occurred. At Clarksville, there were no significant differences in average grain yield among planting dates the first year, whereas a significant and progressive decline in average grain yield occurred with each delay in planting the second year. At Queenstown, early planted wheat produced a higher grain yield than wheat planted on the recommended and late planting dates the first year, whereas early planted wheat yielded less than wheat seeded on subsequent planting dates the second year. In general, changes in spikes per square meter were the major contributors to the yield differences observed among planting dates at both locations. Individual cultivars were variable in yield performance on the different planting dates. Although there was considerable environmental variation in crop performance, increased flexibility in planting date for winter wheat production in the Middle Atlantic states may be possible for certain wheat cultivars. Cultivar and environmental factors will play a large role in determining the success of such a change in current management practices.

Joint contribution of the USDA-ARS and the Maryland Agric. Exp. Stn. Scientific Article no. A-4347, and Contribution no. 7336 of the Maryland Agric. Exp. Stn. Part of a thesis submitted by the senior author in partial fulfillment of the M.S. degree.

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