Facility seedling semiconductor lighting
High-quality seedling cultivation of vegetables, fruits, and flowers is the basis for efficient protected horticultural production. The types of plant seedlings currently used include seedlings, tissue culture seedlings, cutting seedlings and grafted seedlings. Seedling cultivation in facility tray substrate has become the mainstream method of raising seedlings. Japan and other developed countries have researched and developed closed-type seedling cultivation production systems, which completely get rid of the constraints of natural resources and climatic conditions such as geography and seasons, and can be adjusted to meet different plant varieties and different growth periods. Optimal environmental conditions for plant cultivation and production, to produce high-quality, high-yield, efficient and balanced plant seedling products.
Industrialized seedling cultivation can regulate the biological environment, air environment, light conditions and rhizosphere environment, and the efficiency of seedling cultivation is greatly improved. LED light environment regulation has outstanding application advantages in seedling cultivation. The research and development of safe, environmentally friendly, economical and effective LED seedling light source and light environment regulation technology has become one of the key points of agricultural lighting.
Facility horticulture refers to a way of using artificial equipment to produce large-scale and efficient seedlings in a controlled environment under the protection of certain facilities, including tissue culture, cutting seedlings, seedlings, and grafted seedlings. It is a high-tech integration. production system. At present, greenhouse or artificial light seedling cultivation factory is the main form of large-scale seedling cultivation, especially in the latter, environmental factors such as environmental temperature, humidity, light, nutrition, and water can be intelligently controlled, and the three-dimensional multi-layer cultivation space has a high growth rate of plant seedlings. , good consistency, high seedling density, high production efficiency, no occurrence of diseases and insect pests and other advantages, it has great prospects for popularization and application.
Greenhouse seedlings use sunlight as the light source. Although the temperature and other conditions in the environmental factors are controllable, the light regulation cannot be carried out accurately. In addition to the diurnal changes in light and rainy weather, it can only be maintained by supplementary light. The environmental elements and their time and space are uniform. It is also difficult to maintain the ideal level, which will affect the growth rate of seedlings, and the production cycle is uncertain. Therefore, artificial light seedling cultivation plant factory is an ideal facility form for plant seedling production. It has the characteristics of saving costs and increasing efficiency, disaster resistance, and high yield. It is a good technology for large-scale and efficient seedling cultivation of vegetables, and has broad development and application prospects.
The regulation of light environment in facility seedling cultivation is very important, which determines the growth rate and morphological establishment of plant seedlings, plays a leading role in seedling quality control and production efficiency, and the regulation potential is self-evident. Design the LED light source device based on the seedling needs, and control the light quality and the intensity of each component of the LED light source through a computer or a single-chip microcomputer, or even continuously intelligently regulate it.
At present, seedling cultivation is a relatively mature production field in which LED light sources are applied, with many research results and a large application scale. The breakthrough in light quality regulation is the biggest advantage of semiconductor lighting agricultural applications, which is incomparable to traditional light sources. It can meet the continuous demand of plant seedlings for the temporal and spatial dynamics of the light environment, and greatly enrich the technical connotation of environmental regulation of artificial light plant seedling factories. It also fully realizes the in-depth control of the entire environmental elements of the seedling facility. Su Nana et al. (2013) reviewed the research progress on the application of light environment regulation in vegetable seedling cultivation. Using LED as the light source, scholars at home and abroad have extensively studied the growth and development of tissue culture seedlings, seedlings and grafted seedlings of various plants.