Effects of supplemental lighting during the period of rapid fruit development on the growth, yield, and energy use efficiency in strawberry plant production
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 require substantial amounts
of energy. We proposed the use of energy-saving supplemental
lighting, which was applied during rapid fruit development when
the transport of photosynthetic products into the fruit was active.
We measured the physiological responses (photosynthesis, growth,
yield) of the strawberry plants with single fruit truss, wherein the
following 3 treatments were made: plants were cultivated with no
supplemental lighting (control), supplemental lighting throughout
the 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 twice
that of the control treatment. Consequently, the leaf area and dry
weight of the plant body were significantly increased following
normal-light and short-light treatments compared with the control
treatment. The yield for the short-light treatment was also
increased and nearly equal to that of the normal-light treatment
but no significance to the control treatment. However, the energy use efficiency of the short-light was improved 1.5-fold compared
to the normal-light treatment. Thus, shortening the period of supplemental
lighting in accordance with the characteristics of fruit
development is potentially effective.
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