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

Dep. of Plant Science, Univ. of Manitoba, Winnipeg, MB, Canada, R3T 2N2
Dep. of Plant Science, McGill Univ., Macdonald Campus, 21,111 Lakeshore Road, Ste Anne de Bellevue, PQ, Canada, H9X 3V9

^* Corresponding author.

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.

Received for publication June 9, 1993.

This article has been cited by other articles:

				S. Muurinen, J. Kleemola, and P. Peltonen-Sainio Accumulation and Translocation of Nitrogen in Spring Cereal Cultivars Differing in Nitrogen Use Efficiency Agron. J., February 6, 2007; 99(2): 441 - 449. [Abstract] [Full Text] [PDF]