Results 151 to 160 of about 58,703 (187)

Modeling the date of leaf appearance in low‐arctic tundra

Global Change Biology, 2007
AbstractOne of the reported changes of arctic ecosystems in response to warming climate is the advance of the leaf appearance in spring. Such phenological changes play a role in the structural changes within tundra ecosystem communities. Recently, we developed a model that estimates the leaf appearance date for deciduous trees in taiga.
Nicolas Delbart, Ghislain Picard
exaly   +5 more sources

Leaf appearance rate of summer rape

Canadian Journal of Plant Science, 1991
Leaf appearance rate (LAR) is defined as the slope of the regression of leaf number on time of appearance. LARs were calculated for summer rape using both calendar days (CD) and growing degree days (GDD) as measurements of time. The relationship between the number of leaves and GDD or CD was linear.
M. J. Morrison, P. B. E. McVetty
openaire   +2 more sources

Effects of photoperiod on leaf appearance rate and leaf dimensions in winter and spring wheats

Canadian Journal of Plant Science, 1996
Research on genotypic variation in the response of leaf-area production and expansion to photoperiod in wheat is limited. Growth-cabinet experiments using four spring and four winter wheat (Triticum aestivum L.) cultivars and four photoperiod (8, 12, 16 and 20 h) treatments were thus conducted with the objective of investigating the effect of ...
S. Pararajasingham, L. A. Hunt
openaire   +2 more sources

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Prediction of leaf appearance in wheat: a question of temperature

Field Crops Research, 1995
Abstract The rate of leaf appearance in wheat depends on temperature. When the rate is expressed in thermal time based on air temperature, a marked contrast is apparent between autumn and spring sowings. This variation has often been attributed to a preconditioning response that determines the thermal phyllochron at about the time of emergence ...
P D Jamieson, I R Brooking, D R Wilson   +2 more
exaly   +2 more sources

Comparison of models to simulate leaf appearance in wheat

European Journal of Agronomy, 1995
Prediction on of leaf appearance in cereals is important for modelling canopy development and timing crop management practices. Four models which aim to predict leaf emergence on the basis of temperature and, in three cases, photoperiod are compared against independent data from a wide range of sites, sowing dates and cultivars of spring and winter ...
Marco Bindi, F Miglietta
exaly   +3 more sources

Temperature response function for leaf appearance rate in wheat and corn

Canadian Journal of Plant Science, 1999
The ability to predict leaf appearance would enhance our capability of modeling plant development and the rate of leaf area expansion. Many crop models use the constant thermal time for successive leaf tip appearance (which is often termed a phyllochron) as one model parameter to predict total number of leaves and date of anthesis.
Y. W. Jame, H. W. Cutforth, J. T. Ritchie   +2 more
openaire   +2 more sources

Interaction of temperature and daylength on leaf appearance rate in wheat and barley

Agricultural and Forest Meteorology, 1998
A common way of describing wheat phenology during the leaf development stage is by reporting the number of leaves on the main stem. The ability to predict the timing of successive leaf appearance is important because it impacts on the timing of certain developmental stages of the plant and on the rate of leaf area expansion. Therefore, most crop models
J T Ritchie
exaly   +2 more sources

Effect of nitrogen supply on leaf appearance, leaf growth, leaf nitrogen economy and photosynthetic capacity in maize (Zea mays L.)

Field Crops Research, 2005
Leaf area growth and nitrogen concentration per unit leaf area, N-a (g m(-2) N) are two options plants can use to adapt to nitrogen limitation. Previous work indicated that potato (Solanum tuberosum L.) adapts the size of leaves to maintain Na and ...
P E L Van Der Putten, C J Birch
exaly   +3 more sources