A multi-channel supplementary light control method and system for the difference in light requirements of the whole crop

Abstract

The invention discloses a multichannel light supplementation regulation and control method based on light demand differences of whole plants of crops. According to the method, by measuring the ambientlight intensity of top leaves of the plants, the ambient light intensity of leaf positions among the plants is figured out according to leaf transmittance indexes, then a duty ratio signal of each light supplementation lamp is figured out by means of a PWM feedback algorithm of dome lights and lamps among the plants, and therefore the light supplementation amount of a light supplementation lamp group is precisely controlled. If light supplementation is required, the PWM duty ratio signals of the dome lights and lamps among the plants are packaged with ID numbers of the corresponding light supplementation lamps, and a control module ZigBee coordinator issues an instruction to the dome lights or the lamps among the plants, so that the brightness of the light supplementation lamp group is precisely controlled, and intelligent precise light supplementation is achieved according to demands. Meanwhile, the running time of a light supplementation regulation and control system is counted, andthe optimal light supplementation time length of plants in a facility during winter is adopted as a threshold value to conduct dynamic feedback regulation and control of the light supplementation amount of the light supplementation lamp group. The invention also discloses the corresponding system and equipment, and according to the features of the light demand differences of the whole plants, quantitative light supplementation at different leaf positions in the vertical direction of each plant can be achieved as demands.

Description

technical field [0001] The invention belongs to the technical field of plant artificial light supplementation in modern facility agricultural production, and in particular relates to a multi-channel supplementary light control method and system oriented to differences in light requirements of whole plants of crops. Background technique [0002] The planting area and output of facility greenhouses in my country rank first in the world, but facility planting is affected by greenhouse structure, film coverage, weather conditions, etc., its solar radiation transmittance is low, and the intensity of greenhouse light is 30%-70% of that of field, so plants Filling light technology came into being and has been greatly developed. The current plant light supplement technologies include: canopy top leaf supplement light, inter-plant light supplement, and a small amount of three-dimensional supplement light system. However, if the difference in light requirements in the vertical directi...

AI Technical Summary

Problems solved by technology

However, if the difference in light requirements in the vertical direction of the plant is taken into account, as well as the shading of the branches and leaves of tall plants such as tomatoes and cucumbers, the current technology cannot achieve the optimization of plant light supplementation.

[0003] Canopy light supplement technology, if the light is supplemented based on the photosynthetic capacity of the top new leaves, the middle and lower leaves will not get enough light, which will limit photosynthesis and affect the yield; if the middle and lower leaves can get enough light If the light is increased, the new leaves on the top layer will be under light stress due to too strong light, resulting in a decrease in photosynthetic capacity and photoinhibition.

Inter-plant light supplement technology, only install light supplement lights between plants, if the top leaves do not fill light, it will affect the growth of new leaves and affect the growth of the whole plant

At present, some companies such as Philips are designing and applying the whole plant supplementary light system, but they are all fixed supplementary light systems, which do not consider the difference in light requirements of different plant growth leaf positions, and cannot adjust the light intensity of the supplementary light during the entire plant growth process, resulting in Eliminates the coexistence of insufficient and excessive fill light

The current supplementary light control system usually puts the detection module above the supplementary light and uses differential supplementary light. Because the ambient light intensity is constantly changing, the supplementary light is constantly on and off, and the optimization of the supplementary light cannot be realized.

The shortcomings of the above technologies are essentially that they do not consider the difference in light requirements in the vertical direction of the plant and the single function of the current supplementary light control system.

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