LED Light Spectra Acclimatization for Seedling Transplantation Shock
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Solution Overview
Problem
Tree seedlings experience transplantation shock due to abrupt exposure to outdoor sunlight after being grown in controlled environments with limited light spectra, leading to mortality and impaired growth, and existing methods like shading are costly and ineffective.
Innovation Solution
A method and device using LED-based artificial light that emits UV-A, UV-B, violet, blue, red, and far-red spectra to acclimatize seedlings indoors before outdoor transfer, simulating outdoor light conditions to minimize shock and eliminate the need for shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seedlings are kept under shading curtains to avoid transplantation shock, then seedling survival rate improves, but production time increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by exposing seedlings to UV radiation and specific light spectra before outdoor transplantation. This pre-treatment acclimatizes the seedlings to outdoor light conditions, inducing photoprotective mechanisms in advance, thereby eliminating the need for post-transplantation shading curtains and extending the production timeline.
Solution Approach 2:
The patent changes the light spectrum parameters by introducing UV-A, UV-B, and specific visible light wavelengths that are normally filtered out by greenhouse structures. This parameter change in light quality prepares the seedlings' physiological systems to handle full outdoor sunlight spectrum, resolving the contradiction between survival and production time.
2Productivity
If seedlings are exposed to full sunlight immediately after indoor growth, then productivity increases, but seedling mortality increases due to transplantation shock
Solution Approach 1:
The patent implements preliminary action by applying UV radiation and specific light spectra treatment before transplantation. This pre-acclimatization induces photoprotective compounds and physiological adaptations in the seedlings, enabling them to withstand immediate outdoor sunlight exposure without requiring gradual acclimatization periods.
Solution Approach 2:
The patent applies preliminary anti-action by using UV radiation to induce photoprotective mechanisms that counteract the harmful effects of outdoor sunlight. The treatment creates a preemptive defense system in the seedlings, neutralizing the shock effect before it occurs during transplantation.
3Reliability
If greenhouse glass or polycarbonate filters UV light to protect seedlings, then seedling health improves, but acclimatization to outdoor conditions deteriorates
Solution Approach 1:
The patent changes the light spectrum parameters by intentionally introducing UV-A and UV-B radiation that is normally blocked by greenhouse materials. This parameter modification creates a light environment that bridges the gap between protected indoor conditions and harsh outdoor conditions, simultaneously maintaining seedling health and developing acclimatization capability.
Solution Approach 2:
The patent applies local quality by selectively applying UV radiation treatment to specific growth stages and locations within the greenhouse. The treatment is targeted to induce photoprotective mechanisms in the seedlings without exposing them to excessive UV that would cause damage, creating a localized quality enhancement that improves both health and adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances seedling viability and growth, reduces the need for additional work phases, and is effective across various latitudes and growth conditions, improving seedling survival and maturation rates.
Implementation Method 1
at least a part of the incident UV light is produced by light emitting diodes (LEDs)
Implementation Method 2
UV radiation stimulates the production of phenolic compounds protective of excess radiation
Implementation Method 3
many plants in high light environments increase the reflectance of their leaves by acquiring a coat of leaf hairs or wax, as a means of external photoprotection
Data Source
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AI summary
The invention relates to lighting method and devices that can be used to treat a seedling (210, 310) in a growth chamber (360) or greenhouse (200) prior to the introduction of the seedling to outdoors. One aspect of the invention is a light (220, 320, 321) by which the plants can be prepared for the outdoors, by giving them certain wavelengths of light they do not currently receive from the light in the greenhouse or growth chambers. The light of the invention can be applied in smaller doses during the major part of nursing of the seedlings or as a "sun-shock" period in the end of the indoors nursing period. By giving the seedlings light from the invention, they are prepared to Sun light and do not need to spend a few weeks under the sunshade curtains. The invention thus shortens the growth cycle of tree seedlings, enhances the proportion of viable seedlings and eliminates one work phase in the growth process, thus improving the economics of seedling cultivation.