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Agronomy Journal Abstract -

Tissue Nitrogen Levels For Dryland Hard Red Winter Wheat


This article in AJ

  1. Vol. 82 No. 3, p. 561-565
    Received: Jan 30, 1989

    * Corresponding author(s):
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  1. B. Vaughan ,
  2. K. A. Barbarick,
  3. D. G. Westfall and
  4. P. L. Chapman
  1. D ep. of Crop and Soil Sciences, Michigan State Univ, East Lansing, MI 48824
    C hapman, Statistical Dep., Colorado State Univ, Ft. Collins, CO 80523



Plant tissue analysis could be an effective diagnostic tool for identifying N sufficiency or deficiency at early growth stages for hard red winter wheat (Triticum aestivum L.). This study was conducted to determine critical plant tissue N and NO3-N concentrations of three plant parts at three growth stages. Nitrogen was applied preplant (fall) at rates of 0, 22, 44, and 66 kg N ha−1 to establish a range of spring plant tissue N levels and grain yields within a location. Critical plant N levels were calculated by the cate-Nelson procedure. All plant N measurements made at early tiller (Feekes 3) had limited diagnostic value. Late tillering (Feekes 5) and early jointing (Feekes 7) were the best growth stages to sample. Stem and whole-plant NO3-N concentrations were highly variable and have limited use for N recommendations. Total N in the whole plant or in the leaves was found to be the best plant part to sample at Feekes 5 and 7 growth stages. Critical N levels recommended for Feekes 5 growth stages are: 32 g kg−1 total N for the whole plant and 38 g kg−1 total N for the leaves. Critical N levels recommended for Feekes 7 growth stage are: 27 g kg−1 total N for the whole plant and 35 g kg−1 total N for the leaves

Contribution from the Dep. of Agronomy, Colorado State Univ. Funding from Colorado Agric. Exp. Stn., Ft. Collins, CO and Farmland Industries, Kansas City, MO

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