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This article in AJ

  1. Vol. 69 No. 5, p. 885-888
    Received: Aug 8, 1976

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Hard Red and Durum Spring Wheat Responses to Seeding Date and NP-Fertilization on Fallow1,2

  1. A. L. Black and
  2. F. H. Siddoway3



With recent development of high-yielding semidwarf hard red (Triticum aestivum L.) and medium-height durum (T. turgidum L.) spring wheats, information voids have been created in the management guidelines needed to obtain optimum production. Our objective was to determine if the two wheat types, planted at the same rate and seeding depth, would respond similarly to NP-fertilization and to early, medium, and late seeding dates. The soil at both field sites was a Williams sandy loam (fine-loamy, mixed, Typic Argiborolls). Although grain yields were nearly two times greater with 25.1-cm rainfall at Culbertson than with 17.2 cm of rainfall at Outlook, the two speciesof wheat responded similarly to seeding dates and fertilization. Applying N and P, each at 45 kg/ha, significantly increased grain yields 30 to 60% at both sites. With adequate P-fertilizer, ammonium nitrate and urea increased grain yields of both varieties similarly on all three seeding dates.

Based on the results of this study, both types of wheat responded positively to early seeding and NP-fertilization, so there would be no need to prepare separate production and fertilizer management guidelines for each wheat species. Grain yield increases from NP-fertilization were greater for both types of wheat for the early and medium seeding than for the late seeding date.

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