Results 111 to 120 of about 10,955 (156)
Some of the next articles are maybe not open access.
Determination of the Velocities of Projectiles by Light Interception
Nature, 1931THE principle of the method for the determination of the velocity of projectiles described by Taylor and Wark in the issue of NATURE for Dec. 27, p. 994, has been used previously, notably by Kampe de Feriet, who published a full description, illustrated with some excellent photographs, in 1925 (Mem, de l'Art. franc., vol. 4, p. 289).
W. PAYMAN, D. W. WOODHEAD
openaire +1 more source
Light interception, photosynthesis and crop productivity
Outlook on Agriculture, 1982For a crop plant, it is suggested that photosynthetic productivity is governed by the capacity for carbon dioxide fixation available at any given time; by a host of environmental and physiological factors which may limit photosynthesis to less than capacity; and by the rate at which assimilate is partitioned into useful yield organs. The photosynthetic
openaire +1 more source
A PROTOTYPE SENSOR FOR ESTIMATING LIGHT INTERCEPTION BY PLANTS IN A GREENHOUSE
Acta Horticulturae, 2008Light interception is one of the most important factors for plant growth. The intercepted amount depends on the incoming radiation in the greenhouse and the percentage of interception by the crop and is directly related to the leaf area. Proper crop management requires the measurement of the most important growing factors.
Janssen, H.J.J. +5 more
openaire +1 more source
A Test of a Model for Light Interception by Mixtures
Australian Journal of Plant Physiology, 1985Predicted and observed data for the amount of light energy intercepted by mixtures of clover and ryegrass are compared, in an additional test of a model which relates competition for light to crop dry matter production. The closeness of predicted and observed values for light interception implies that the optical properties of the component species do ...
openaire +2 more sources
Analysis of Light Interception by Single Plants
Annals of Botany, 1981The two traditionally distinct treatments of growth analysis, using either relative growth rate (RGR) or crop growth rate (CGR), can be integrated in a single treatment in which RGR is a component of CGR. CGR can alternatively be analysed as the product of incident light receipt, efficiency of light interception (as determined by leaf area index and ...
openaire +1 more source
A simulation model for hedgerow light interception and growth
Agricultural and Forest Meteorology, 2001Abstract In order to investigate competition for light between trees and crops in an agroforestry system, we wrote a simulation model of light interception and growth by a system of hedgerows and an interplanted crop. To calculate light interception, hedgerows are modeled as long prisms, solar angles and hedgerow shadow lengths are calculated, and ...
James B Friday, James H Fownes
openaire +1 more source
Canopy Structure, Light Interception, and Photosynthesis in Maize
Agronomy Journal, 2003The amount and distribution of leaf area and leaf angles in a crop canopy determine how photosynthetically active radiation (PAR) is intercepted and consequently influences canopy photosynthesis and yield. Factors such as plant shape, plant populations, and row width will affect these leaf distributions and can occur in an almost infinite number of ...
D. W. Stewart +5 more
openaire +1 more source
Interception of Light and Light Penetration in Plant Tissues
1996There are three potential fates for a photon arriving at a tissue: it can be reflected, absorbed, or transmitted. All three factors are inter-related. The probability of one of these fates depends on the wavelength and the angle of incidence of the radiation, and on several characteristics of the tissue.
openaire +1 more source
Petiole mechanics, light interception by Lamina, and “Economy in Design”
Oecologia, 1992Computer simulations were used to assess the influence of palmate leaf morphology, decussate phyllotaxy, and the elastic moduli of petioles on the capacity of turgid and wilted twigs ofAesculus hippocastanum to intercept direct solar radiation. Leaf size, morphology, orientation, and the Young's and shear moduli (E and G) of petioles were measured and ...
openaire +2 more sources
Three dimensional model of the interception of light by a canopy
Agricultural and Forest Meteorology, 1998Abstract We present a computer model that simulates, in three dimensions, the interception of light by a canopy. The model divides the canopy into cubic cells, each one characterized by mean leaf angle and the leaf area index. The model calculates the probability that a beam will penetrate to any given cell without being intercepted by the foliage in
Francisco de Castro, Ned Fetcher
openaire +1 more source