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This article in AJ

  1. Vol. 68 No. 6, p. 919-922
    Received: May 1, 1975

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Anhydrous Ammonia Applications during Fallow for Winter Wheat Production1

  1. D. E. Smika and
  2. P. H. Grabouski2



Anhydrous ammonia (NH3) was applied at the rate of 67 kg/ha on 20 July and 8 September the summer after harvest and 15 May, 30 May, 15 June, 30 June, 15 July, 30 July, and 15 August the following summer during two 14-month fallow periods on Aridic Haplustoll and Torripsamment soils. The study was conducted to determine the ammonia application date during the 14-month fallow period which produced the soil water-soil NO3-N distribution in the soil resulting in the maximum protein levels and grain yields of winter wheat (Triticum aestivum L.). Soil NO3-N and soil water contents were determined to a 180 cm depth on each application date and at wheat seeding (15 September). In the Aridic Haplustoll soil, NH3 had to be applied in the summer after harvest (over 1 year before wheat seeding) for maximum NO3-N accumulation in the soil between 60 and 120 cm which produced the highest protein grain (14.5%) and the highest yield (3,269 kg/ha). In the Torripsamment, NH3 applications between 15 May and 30 June the year of wheat planting produced highest protein grain (13.4%) and highest grain yields (2,688 kg/ha). However the optimum NH3 application date to produce the desired NO3-N accumulation in the 60 to 120 or 150 cm soil depths in the Torripsamment was not determined in this study.

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