Abstract
Abstract The actinometric method, based on photolysis of uranyl oxalate, was adapted for measuring integrated light irradiance in plant canopies. The unique characteristics of the new actinometers are their small size, the avoidance of pressure build-up in the measuring cell, the good correlation with quantum sensors, and their response to the cosine law. The proposed system is inexpensive and reliable, integrates light measurement over a relatively long period, and needs little additional instrumentation. Numerous measurement points scattered in plant canopies can be determined simultaneously by this method, thus improving assessment of the light regime in fields and orchards. This paper describes such measurements in a peach meadow orchard planted at 2 densities, where 27 actinometers were dispersed in each density treatment and replicate
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