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Light Interception Efficiency Measurements
Journal of Agronomic Education, 1972ABSTRACTLight interception efficiency of leaves with widely different display patterns is measured in this exercise. An extinction coefficient (k) is used to study differences among species in their light interception characteristics. A grass represents an inefficient light intercepting canopy, while a legume stand represents a relatively efficient ...
D. D. Wolf, E. Carson, R. H. Brown
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Determination of the Velocities of Projectiles by Light Interception
Nature, 1930WE have developed a light interception method for the determination of the velocity of projectiles in the immediate neighbourhood of the muzzle.
JAMES TAYLOR, ROBERT WARK
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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
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LIGHT INTERCEPTION OF LIGHTING SYSTEMS, VENLO AND WIDE SPAN TYPE GREENHOUSES
Acta Horticulturae, 2006TNO has developed a computer program to calculate the light interception of the greenhouse structure using an improved half-perimeter method, taking into account reflections and shadowing. This program is used to compare the light interception of Venlo and Wide span type greenhouse.
Janssen, E., Hart, H. 't
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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 ...
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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
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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
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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
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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 ...
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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
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