The invention belongs to the technical field of
agriculture and illumination and in particularly relates to a method for
postharvest preservation of vegetables and fruits by
LED illumination. A
postharvest preservation device comprises a vegetable and fruit storage and transport box, LED drive controllers, aluminum substrates, LED light sources, optical elements, a storage shelf and storage plates. The LED drive controllers, heat radiators, the aluminum substrates, the LED light sources and the optical elements form illumination systems which are mounted on the tops of the storage plate
layers of the storage and transport box; the storage shelf is ladder-shaped; the plurality of the storage plates are mounted on the storage shelf from top to bottom. In the illumination systems, the LED drive controllers are electrically connected with the LED light sources, and the work current, the frequency and the duty ratio of each LED
light source are adjusted in a pulse-width modulation way so as to adjust the light output quantity, the frequency and the duty ratio of each LED
light source; one optical element is mounted in front of each LED
light source, and light emitted from the LED light sources is intensively and uniformly irradiated on the storage plates through the optical elements. According to the method, the
respiration intensity of the vegetables and fruits is reduced through illumination to achieve the purpose of preservation and prevent
pathogenic bacteria.