Results 221 to 230 of about 52,441 (254)

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 ...
D R Wilson, J R Porter, P D Jamieson
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, Franco Miglietta, J R Porter   +2 more
exaly   +3 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

Quantitative analysis of maize leaf collar appearance rates

Plant Physiology and Biochemistry, 2023
Phyllochron, the reciprocal of the leaf appearance rate, is a critical genetic parameter in crop models for predicting growth characteristics and yield. Previous studies have shown that existing observations and predictive algorithms do not adequately represent a broad range of cultivars and environments.
Honggen Xu, Bo Ming, Keru Wang, Jun Xue, Peng Hou, Shaokun Li, Ruizhi Xie   +6 more
openaire   +2 more sources

Rate of Leaf Appearance in Crimson Clover

Crop Science, 2002
Understanding factors that affect growth and development of crimson clover ( Trifolium incarnatum L.) are important for the development of management practices to optimize forage utilization. In a 3‐yr field experiment at College Station, TX, we evaluated the effects of planting date on rate ...
Twain J., Butler, Gerald W., Evers, Mark A., Hussey, Larry J., Ringer   +3 more
openaire   +2 more sources

Simulating Leaf Appearance in Rice

Agronomy Journal, 2008
Most rice (Oryza sativa L.) simulation models assume that only temperature affects leaf appearance rate (LAR). This assumption ignores results from controlled environment studies that show that LAR in rice is not constant with time (calendar days) under constant temperature.
Nereu Augusto Streck, Leosane Cristina Bosco, Isabel Lago   +2 more
openaire   +1 more source

Floral initiation, leaf initiation and leaf appearance in sunflower

Field Crops Research, 1993
Abstract This paper examines the hypothesis that leaf number visible at floral initiation (LN n ) and final leaf number (FLN) are correlated in sunflower ( Helianthus annuus L.). The relationship between these variables is described by a model that takes into account the rate of leaf primordium initiation (RPI), the rate of leaf appearance (RLA) and
V.O. Sadras, F.J. Villalobos
openaire   +1 more source

Leaf Appearance Rate and Final Leaf Number of Switchgrass Cultivars

Crop Science, 1997
In switchgrass (Panicum virgatum L.), maximum yields occur with late flowering genotypes that have an extended duration of vegetative growth. However, little is known about the developmental basis for a long vegetative growth phase in perennial grasses.
G. A. Van Esbroeck, M. A. Hussey, M. A. Sanderson   +2 more
openaire   +1 more source

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   +1 more source

Daylength change and leaf appearance in winter wheat

Plant, Cell and Environment, 1980
Abstract In the field successive leaves of winter wheat appear at a rate which varies because it depends strongly upon temperature. When plotted against ‘thermal time’, however (temperature accumulated above a fixed base of 0°C), leaf appearance was a strictly linear function of temperature.
C. K. BAKER, J. N. GALLAGHER, J. L. MONTEITH   +2 more
openaire   +1 more source