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Agronomy Journal Abstract -

Yield-Independent Variation in Grain Nitrogen and Phosphorus Concentration among Ethiopian Wheats


This article in AJ

  1. Vol. 89 No. 3, p. 497-506
    Received: Aug 28, 1995

    * Corresponding author(s): schulthe@cps.msu.edu
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  1. Urs Schulthess ,
  2. Boy Feil and
  3. Samuel C. Jutzi
  1. D ep. of Crop & Soil Sciences, Michigan State Univ., Plant and Soil Sciences Bldg., East Lansing, MI 48824-1325
    I nst. of Plant Sci., ETH Zürich, Universtätstrasse 2, CH-8092 Zürich, Switzerland
    G esamthochschule Kassel, FB Internat. Agrarwirtschaft, Steinstrasse 19, D-37213 Witzenhausen, Germany



New semidwarf wheat (Triticum aestivum L.) cultivars and new land management practices for Vertisols are being introduced in Ethiopia. Our objectives were to (i) determine the variation of N and P content and concentration in the grain and whether these are related to grain yield, (ii) test cultivar response to different fertility levels, and (iii) assess componentraits of N and P yield. Five bread wheat cultivars and three durum wheat (Triticum durum Desf.) cultivars were sown in Exp. 1 at three locations in Ethiopia on two dates. In Exp. 2, seven of these cultivars were grown on a P-deficient soil at four N levels (0, 20.5, 41, 61.5 kg N ha−1) and four P levels (0, 10, 20, 30 kg P ha−1); in Exp. 3, two cultivars were grown in all possible combinations of the same four N and P levels. Grain yields did not differ among cultivars, but significant variations were found for total shoot N and P, grain N and P yield, and grain N and P concentration. Cultivar differences in these traits were fairly consistent across the treatments and were corroborated by Exp. 3. The N and P concentrations in the grain were not related to grain yield (r = 0.36 NS for N; r = 0.28 NS for P). There was a positive association between grain N and P concentrations in Exp. 1 (r = 0.66; P = 0.07) and in Exp. 2 (r = 0.92; P < 0.01). The N and P grain yields were related to total shoot N and P at maturity (r = 0.99; P < 0.001). However, postanthesis accumulation of N was more closely related to postanthesis dry matter accumulation (r = 0.84; P < 0.05) than to the postanthesis accumulation of P (r = 0.56 NS). Total shoot varied by as much as 50%. Thus, cultivar choice is an important factor determining removal of P from the soil.

Joint contribution of the Inst. of Plant Sci., ETH Zürich, Switzerland, and the Int. Livestock Res. Inst. (ILRI), Nairobi, Kenya. Based on part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

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