Method for hydroponically culturing lettuce by means of LED light source

Abstract

The invention discloses a method for hydroponically culturing lettuce by means of an LED light source. The method is characterized by comprising the following steps that 1, after lettuce seeds are germinated, seedling raising is conducted, and hydroponic culturing is conducted in a nutritional solution till seedlings growing out 3-4 true leaves are obtained; 2, transplanting and field planting are conducted on the seedlings; 3, after transplanting, light treatment is conducted on the seedlings, and the lettuce seedlings with the 3-4 true leaves are placed under an LED combining red light, blue light and green light to be cultured for 30 days to 33 days, wherein the wave length of the red light ranges from 655 nm to 660 nm, the wave length of the blue light ranges from 455 nm to 460 nm, the wave length of the green light ranges from 520 nm to 525 nm, the light intensity is 400 mumol.m<-2>.s<-1>, and the effective photosynthetic light quantum density percentage ratio of the red light to the blue light to the green light is 36:24:40. According to the method, a red-blue-green LED light control console is adopted, a specific proportion of green light is added in the red light and the blue light on the condition that the total light intensity keeps consistent, therefore, the lettuce which is high in yield, good in quality and high in beneficial mineral element content can be produced, and high-quality and efficient production of the hydroponically-cultured lettuce is achieved.

Description

technical field [0001] The invention relates to the field of LED light source configuration, in particular to a method for hydroponic lettuce in a plant factory using three kinds of LED combined light sources: red light, blue light and green light. Background technique [0002] With the continuous increase of people's demand for vegetables, facility vegetable cultivation has been widely used in production due to its safe and efficient production management methods. The adjustment of the light environment in the facility is an effective way to improve the production efficiency of vegetables. The light environment includes three aspects: light intensity, light time and light quality combination. Plants perceive different wavelengths of light through different photoreceptors (phytochrome, cryptochrome, phototropin). The incident light of different bands is absorbed by different photoreceptors, triggering different physiological responses, and the quality of light has a signif...

AI Technical Summary

Problems solved by technology

In the past, the research on the combination of LED light sources mostly focused on the different red and blue light qualities, and there were few studies on the addition of green light.

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