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This article in AJ

  1. Vol. 75 No. 6, p. 1031-1036
     
    Received: Jan 20, 1983
    Published: Nov, 1983


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doi:10.2134/agronj1983.00021962007500060037x

Nitrogen Distribution in Roots and Tops of Winter Wheat1

  1. T. L. Smith,
  2. G. A. Peterson and
  3. D. H. Sander2

Abstract

Abstract

The hypothesis has been proposed that the observed N losses from the aboveground parts of wheat (Triticum aestivum L.) near maturity might be explained by N redistribution to roots during the late grainfill period. This experiment was designed to test this hypothesis. Plant response to four N levels using a modified Hoagland's solution was studied in gravel culture. Roots and tops were harvested 12 times during the growth cycle and analyzed for N content. Nitrogen uptake patterns for roots and shoots were similar. At about 50 days after jointing (Feeke's Stage = 11.2) both roots and shoots began to lose N, while head N increased from anthesis to maturity. Gains in head N exceeded the amounts lost from the roots and shoots. So, N uptake from the culture solution continued through maturity. The hypothesis that N is redistributed to the roots near maturity in winter wheat was rejected. Roots were actually a source of N for translocation to the grain, as were aboveground stems and leaves.

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