Partitioning of Radiation within a Maize Crop

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Date
1980
Authors
Njihia J. K.
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Abstract
Global radiation, net radiation, reflection and transmission coefficients of global radiation were measured in a maize crop planted at three densities .A consistent relationship between the reflection coefficient of global radiation and plant density (2±4%, 19:±:4% and 17±3% over the canopies of densities H, N and L respectively) was observed only during the flowering phase. The transmission coefficient of global radiation increased as plant density decreased. On the average, the transmission coefficient was minimum during the flowering phase. The lowest (13±4%) and the highest (48±17%) values of transmission coefficient were obtained in densities H during the flowering phase and L during the ripening phase) respectively. The absorption coefficient of global radiation for the maize crop decreased with decreasing plant density; variations from phase to phase were not sufficiently precise. The lowest (38±21 %) and the highest (67-+-10%) values of absorption coefficient were observed during the vegetative phase in densities Land H respectively. The pattern of transmission and absorption of net (total) radiation was similar to that of global radiation. The net radiation below canopy expressed as a percentage of net radiation above canopy increased as plant density decreased. The lowest (13±4 %) and the highest (45±10%) values were obtained during the vegetative phase in densities Hand L respectively
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East African Agricultural And Forestry Journal, XLV (No. 3), p. 194-202
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