Abstract
ABSTRACT COMPLETELY controlled environments are being used in commercial production of plants. If pulsed light promoted photosynthesis more efficiently than con-tinuous light, its use might conserve considerable energy in controlled environment systems. To test the effect of pulsed light on photosynthesis in cucumbers, a Latin square statistical design in which 10 pulsed light treatments were paired with continuous light of equal average intensity of 10.76 klx (kilolux) (1000 ft c.) was developed. Frequencies of 10, 40, 160, 640 and 2560 Hz each at 25 and 50 percent duty cycle were the pulse treatments. The results show that apparent photosynthesis (AP) was higher under pulse treatments than under continous light. With the treatment of 10 Hz, 25 percent duty cycle AP averaged over 16 percent higher than that with con-tinuous light. The utilization of light generally increased as the frequency decreases. The 25 pecent duty cycle im-proved apparent photosynthesis over either continuous or the pulsed at 50 percent duty cycle.
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