Effects of supplemental lighting during the period of rapid fruit development on the growth, yield, and energy use efficiency in strawberry plant production
التفاصيل البيبلوغرافية
العنوان:
Effects of supplemental lighting during the period of rapid fruit development on the growth, yield, and energy use efficiency in strawberry plant production
Supplemental lighting techniques in greenhouses can increase plant growth and yield but required much energy. We proposed an energy-saving supplemental lighting which was applied during rapid fruit development when transport of photosynthetic products into fruit was active. We experimented physiological responses (photosynthesis, growth, yield) of strawberry plants with single fruits truss, wherein the following 3 treatments were made: plants were cultivated with no supplemental lighting (Control), supplemental lighting throughout experimental period (Normal- light), and supplemental lighting during rapid fruit development (Short- light). The period of rapid fruit development corresponded to 33% of the experimental period, and the cumulative light intensity for the Short- light treatment was half of that for the Normal- light treatment, and two- fold of that for the Control treatment. Consequently, the leaf area and dry weight of the plant body were significantly increased upon Normal- light and Short-light treatments compared with the Control treatment. Yield for the Short- light treatment was also increased and nearly equal to that for the Normal- light treatment but no significance to the Control treatment. However, energy use efficiency of the Short-light was improved by 1.5- fold of the Normal- light treatment. Thus, shortening the period of supplemental lighting in accordance with the characteristics of fruit development is potentially effective.
