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Crop Science Abstract -

Post-Heading Nitrogen Uptake, Retranslocation, and Partitioning in Spring Barley


This article in CS

  1. Vol. 34 No. 4, p. 977-984
    Received: June 9, 1993

    * Corresponding author(s):
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  1. Patrick Bulman and
  2. Donald L. Smith 
  1. D ep. of Plant Science, Univ. of Manitoba, Winnipeg, MB, Canada, R3T 2N2
    D ep. of Plant Science, McGill Univ., Macdonald Campus, 21,111 Lakeshore Road, Ste Anne de Bellevue, PQ, Canada, H9X 3V9



In cereals, N provided to the developing grains comes from continued N uptake and assimilation after anthesis and from the retranslocation of previously accumulated vegetative N. This study investigated management and cultivar effects on post-heading N uptake and their relationship with total plant and grain N accumulation and grain protein concentration (GPC). Twenty six-rowed spring barley (Hordeum vulgare L.) cultivars were grown on a Chateauguay clay soil (fine loamy, mixed nonacid, frigid, Typic Hapludalf) in 1988 under conventional management (recommended N, no fungicide or growth regulator) and on a Bearbrook clay soil (very fine silty, mixed nonacid, frigid, Humaquept) in 1989 and 1990 under conventional and intensive (high N, fungicide and plant growth regulator) managements. Postheading N uptake was generally not related to N concentration and N per plant at awn emergence but was highly correlated with total dry matter accumulation after anthesis and moderately to highly correlated with total plant and grain N per plant at harvest. Postheading N uptake seemed related to the amount of tillering that occurred after anthesis. High-GPC cultivars did not accumulate more N after heading than low-GPC cultivars. Nitrogen retranslocation was correlated with total dry matter and N per plant at awn emergence, but the relationship varied with growing season and management. Nitrogen retranslocation and N harvest index were not correlated with GPC. Post-heading N uptake and N retranslocation were negatively but moderately correlated with each other.

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Copyright © 1994. Crop Science Society of America, Inc.Copyright © 1994 by the Crop Science Society of America, Inc.