Tests of a uranyl oxalate light integrator for use in fruit tree canopies.
The integrator consisted of a table-tennis ball containing a solution of photolysable uranyl oxalate. Provided exposure ceased before 70% of the oxalate was decomposed and that the total irradiance exceeded 6 mW./sq.cm., estimates of comparative integrated light values could be made with a standard deviation of less than 3% at any particular site. Integration periods of up to a week could be measured by using dark-stained integrators.-C.S.I.R.O., Merbein, Vict. 3505.