Modeling light and temperature effects on leaf emergence in wheat and barley.

T. Volk, B. Bugbee

Research output: Contribution to journalArticle

Abstract

Phenological development affects canopy structure, radiation interception, and dry matter production; most crop simulation models therefore incorporate leaf emergence rate as a basic parameter. A recent study examined leaf emergence rate as a function of temperature and daylength among wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) cultivars. Leaf emergence rate and phyllochron were modeled as functions of temperature alone, daylength alone, and the interaction between temperature and daylength. The resulting equations contained an unwieldy number of constants. Here we simplify by reducing the constants by > 70%, and show leaf emergence rate as a single response surface with temperature and daylength. In addition, we incorporate the effect of photosynthetic photon flux into the model. Generic fits for wheat and barley show cultivar differences less than +/- 5% for wheat and less than +/- 10% for barley. Barley is more sensitive to daylength changes than wheat for common environmental values of daylength, which may be related to the difference in sensitivity to daylength between spring and winter cultivars. Differences in leaf emergence rate between cultivars can be incorporated into the model by means of a single, nondimensional factor for each cultivar.

Original languageEnglish (US)
Pages (from-to)1218-1224
Number of pages7
JournalCrop Science
Volume31
Issue number5
StatePublished - Sep 1991

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leaf emergence
photoperiod
barley
wheat
temperature
cultivars
ecological value
crop models
dry matter accumulation
Hordeum vulgare
simulation models
Triticum aestivum
canopy
winter

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Modeling light and temperature effects on leaf emergence in wheat and barley. / Volk, T.; Bugbee, B.

In: Crop Science, Vol. 31, No. 5, 09.1991, p. 1218-1224.

Research output: Contribution to journalArticle

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