[Source: "High-tech LED-technology and application" October issue] In recent years, with the continuous development of agricultural production technology and the increasing demand for increasing planting yield and shortening the planting cycle, artificial light sources are increasingly used in the field of plant growth, such as vegetables, fruits, flowers, etc. Growing lighting use.
Xu Zhigang, a professor at Nanjing Agricultural University, said that light has magical power and has a regulatory effect on photosynthesis, growth and development, morphogenesis and material metabolism of plants.
At present, plant lighting technology is mainly used in two aspects: one is the supplementary irradiation of plant photosynthesis when the amount of sunshine is small or the sunshine time is short; the second is the induced irradiation of plant photoperiod and light form, according to different colors The state of growth under the light source, looking for the "nutrition light" that is most suitable for plant growth.
LED light source has obvious advantages LED is a new type of illumination source that has received wide attention and received market acceptance in recent years, and has many characteristics different from other electric light sources. "According to the special research project of Nanjing Agricultural University, the LED wavelength type is rich, and there is a large room for regulation, which is suitable for plant lighting." Xu Zhigang said that, for example, radish and green vegetables require different illumination controls during the cultivation process. With LED light sources, different wavelengths can be configured according to their respective preferences.
Fu Xinghong, chief engineer of Beijing Tongfang Lansen Lighting Technology Co., Ltd., also pointed out that LED can provide high-power combined light source with specific wavelength. It can configure appropriate wavelength according to the properties of plants, improve the efficiency of light use, and promote early maturity and early flowering of plants. Early results.
According to Fu Xinghong, LED blue chip and red light chip are arranged in a reasonable proportion, which is very beneficial to the growth of plants. In addition to the winter seedlings, there are also common vegetables such as strawberries, tomatoes, peppers, eggplants and cucumbers. Suitable for planting all year round.
At the same time, in the cultivation process of sprouts, the leaf size, chlorophyll or carotene and vitamin content can be achieved by light regulation, and the nutritional value of vegetables is higher. Strawberries and tomatoes grown under the condition of LED light source, after special wavelength irradiation, strawberries and tomatoes will be full of fruit, the content of sugar and vitamin C will increase obviously, and there will be no hollow phenomenon, which is better than ordinary greenhouse fruit.
Unfinished
For more information, please refer to the October issue of "High-tech LED-Technology and Applications" 
