Monitoring technique of energy and ecological efficiency of indoor plant lighting
2016
Rakutko, S., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., St. Petersburg (Russian Federation) | Rakutko, E., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., St. Petersburg (Russian Federation) | Kaposhko, D., Saint-Petersburg State Agrarian Univ. (Russian Federation) | Vaskin, A., Saint-Petersburg State Agrarian Univ. (Russian Federation)
The article presents the technique and the monitoring results of energy and ecological efficiency for two growing environments of lettuce (Lactuca sativa L.). In a plant growing experiment, under otherwise equal conditions, two different radiation sources were used with different photosynthetic photon flux but practically the same illuminance of 10 kLx in the plant-growing zone. In the first irradiation facility an induction 400 W lamp was installed. The ratio of emission intensity between three spectral bands (blue kB 400-500 nm, green kG 500-600 nm and red kR 600-700 nm) was kB : kG : kR = 22 % : 41 % : 37 %. In the second irradiation facility the sodium lamps with the same wattage were used. The ratio was kB : kG : kR = 10 % : 61 % : 29 %. During the plant growing period the dynamic pattern of irradiance in the plant cultivation zone was recorded; the samples of plants were taken with a certain time interval; dry matter content and the total leaf area in the sample plants were measured. The hodograph curves were plotted in the coordinates of dry matter increments, accumulated in plant leaves, and the increments of optical radiation flow dose up-taken by plants during the growing period. Reference hodograph was plotted for the lettuce plants grown under standard climate parameters and cultivation regimes. The level of energy and ecological efficiency of indoor plant lighting was estimated by the value of the normed sum of squared differences (NSSD) of coordinates of points of the experimental and the reference hodographs. In the first irradiation facility the value of NSSD = 0.0039 arbitrary units is smaller than that in the second IF (NSSD = 0.0016 arbitrary units). This indicates the higher level of energy and ecological efficiency for conditions in the second irradiation facility. The experiment proved that the level of indoor plant lighting energy and ecological efficiency essentially depends on the type of the irradiation source.
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