Method for using LED light source to lower nitrate content in leaf vegetables

A technology of nitrate content and LED light source, applied in gardening methods, botanical equipment and methods, applications, etc., can solve the problems of rising ambient temperature, inability to use light energy, and low utilization rate of plant light energy, so as to reduce nitrate content , the effect of reducing energy consumption

Active Publication Date: 2014-04-16
GUANGXI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The absorption of light by plants is not full-band but selective. Only light with a wavelength of 400-700nm can be used for photosynthesis, which is called photosynthetically active radiation. Ultraviolet light with a wavelength of less than 400nm and far-red light with a wavelength of 700-800nm ​​cannot It directly acts on photosynthesis, but it can be used as an environmental signal to regulate the process of plant growth and metabolism; plants cannot use light with a wavelength greater than 800nm, and this part of light is mostly dissipated in the form of thermal radiation
Therefore, for high-pressure sodium lamps, halogen lamps, incandescent lamps, and other continuous-wavelength (300-1500nm or wider wavelength range) light sources (hereinafter referred to as ordinary light sources), plants have a low utilization rate of light energy. It belongs to the thermal light source, which is easy to cause the ambient temperature to rise, and cannot be close to the plant irradiation, which is not conducive to the precise regulation of the growth and metabolism of the plant.

Method used

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  • Method for using LED light source to lower nitrate content in leaf vegetables
  • Method for using LED light source to lower nitrate content in leaf vegetables
  • Method for using LED light source to lower nitrate content in leaf vegetables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0018] The distribution of the three kinds of LED lights on the irradiation unit is: the blue LED lights are evenly distributed on a circle with a diameter of 8.5cm; the red LED lights are evenly distributed on a circle with a diameter of 4.5cm; the infrared light is evenly distributed On a circle with a diameter of 2.5cm, the center of the circle where the three LED lights are located coincide;

[0019] Blue light: wavelength 450nm, light quantum flux density 0.78μmol·m -2 ·S -1 ;

[0020] Red light: wavelength 630nm, light quantum flux density 0.79μmol·m -2 ·S -1 ;

[0021] Infrared light: wavelength 735nm, light quantum flux density 0.45μmol·m -2 ·S -1 ;

[0022] 10 days before the picking of Chinese cabbage, lettuce and spinach, use 22:00-2:00 every night figure 1 The shown LED irradiation unit irradiates for 4 hours. Each vegetable experiment area 3m 2 , Install 3 irradiation units each, the number of LED lights installed in each irradiation unit is 5 blue LED lights, 3 red LED...

Embodiment 1-2

[0024] The number of LED lights in the irradiation unit of Example 1-1 is doubled according to the ratio of blue light: red light: infrared light = 5:3:2, namely 10 blue LED lights, 6 red LED lights and infrared light There are 4 LED lights, and the rest of the experiment methods are the same as in Example 1-1.

Embodiment 2-1

[0028] The distribution of the three types of LED lights on the irradiation unit is: the blue LED lights are evenly distributed on a circle with a diameter of 12.5 cm; the red LED lights are evenly distributed on a circle with a diameter of 6.5 cm; the infrared light is evenly distributed On a circle with a diameter of 3.5cm, the center of the circle where the three LED lights are located coincide;

[0029] Blue light: wavelength 440nm, light quantum flux density 0.78μmol·m -2 ·S -1 ;

[0030] Red light: wavelength 620nm, light quantum flux density 0.79μmol·m -2 ·S -1 ;

[0031] Infrared light: wavelength 745nm, light quantum flux density 0.45μmol·m -2 ·S -1 ;

[0032] 8 days before the picking of Chinese cabbage, lettuce and spinach, use 22:00-2:00 every night figure 1 The shown LED irradiation unit irradiates for 4 hours. Each vegetable experiment area 3m 2 , Each install 3 irradiation units, the irradiation height is 80cm from the top of the plant.

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Abstract

The invention provides a method for using an LED light source to lower nitrate content in leaf vegetables. The method includes making an LED irradiating unit by utilizing blue-light, red-light and infrared-light LEDs different in wavelength and photon flux density value according to a lamp number proportion of 5:3:2 (blue light, red light and infrared light); 7-10 days before harvesting of the leaf vegetables like flowering cabbage, lettuce and spinach, using the LED irradiating unit to irradiate places being 50-100cm above plants within a time period from 22:00 to 2:00 for four hours each day for supplementary lighting. By the method, the nitrate content in harvested organs can be lowered in an extremely obvious manner, damage to human body due to the fact that the nitrate content in the leaf vegetables exceeds a safe standard can be prevented, and a novel technique is provided for guaranteeing quality safety of harmless vegetables.

Description

Technical field [0001] The invention relates to the technical field of vegetable production, in particular to a method for reducing the nitrate content of leaf vegetables by using an LED light source. Background technique [0002] The absorption of light by plants is not full-wavelength but selective. Only light with a wavelength of 400-700nm can be used for photosynthesis, which is called photosynthetic active radiation. Ultraviolet light with a wavelength of less than 400nm and far-red light at 700-800nm ​​cannot It acts directly on photosynthesis, but it can be used as an environmental signal to regulate plant growth and development and metabolism; plants cannot use light with a wavelength greater than 800nm, and this part of the light is mostly dissipated in the form of heat radiation. Therefore, for high-energy-consuming high-pressure sodium lamps, halogen lamps, incandescent lamps and other continuous-wavelength (300-1500nm or wider wavelength range) light sources (hereinaf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G7/04
CPCY02P60/14
Inventor 于文进阳燕娟龙明华
Owner GUANGXI UNIV
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