Hydroponic Vegetable Production via Phase-Specific Light Spectra
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Solution Overview
Problem
Current hydroponic methods for vegetable production do not effectively optimize light spectra and nutrient solutions to enhance the taste and nutritional content of harvested vegetables, particularly in terms of glutamine and sugar content, leading to suboptimal flavor and nutritional profiles.
Innovation Solution
A hydroponic vegetable production method that involves specific light spectra and nutrient solutions, where the vegetable is grown with first light having a maximum intensity in the 420-490 nm range during part of the growth period to increase glutamine and sugar content, and second light with peak intensity in the 590-650 nm range in other periods to balance photosynthesis and reduce antioxidant production, along with tailored nutrient solutions to adjust nitrogen and calcium oxide levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional hydroponic methods use standard lighting and nutrient solutions, then vegetable growth is maintained at normal levels, but the glutamine and sugar content remains suboptimal, resulting in poor taste and nutritional profile
Solution Approach 1:
The growth period is divided into distinct phases (germination, early growth, late growth) with each phase receiving tailored light spectra and nutrient solutions. The light spectrum is segmented into specific wavelength ranges (blue 420-490nm, red 590-650nm, green 500-590nm) with different intensity ratios applied at different stages to optimize glutamine and sugar accumulation.
Solution Approach 2:
The patent systematically changes multiple parameters including light wavelength composition, light intensity ratios, nutrient concentration, and nitrogen/calcium oxide levels throughout the growth cycle. These parameter changes are timed to specific growth stages to maximize the accumulation of desirable compounds while managing plant stress responses.
2Quantity of substance
If blue light (420-490 nm) intensity is increased to enhance glutamine and sugar production, then nutritional content improves, but excessive antioxidant production occurs which can lead to plant stress
Solution Approach 1:
The patent employs periodic variation in light spectrum composition, alternating between periods of higher blue light intensity (to stimulate glutamine and sugar production) and periods of reduced blue light with enhanced red and green light (to reduce oxidative stress). This periodic modulation allows the plant to accumulate desired compounds while periodically recovering from stress.
Solution Approach 2:
Different wavelength regions of light are applied with different intensities at different times to achieve localized optimization. Blue light (420-490nm) is intensified during specific phases to boost metabolic production, while red (590-650nm) and green (500-590nm) light are enhanced during other phases to counterbalance stress, creating a temporally differentiated light environment.
3Productivity
If nitrogen content in nutrient solution is increased to promote vegetative growth, then growth rate improves, but nitrate concentration in the vegetable increases which is unhealthy
Solution Approach 1:
The nutrient solution composition is dynamically adjusted throughout the growth cycle rather than remaining static. Nitrogen levels are optimized for rapid growth during early vegetative stages, then gradually reduced or converted to different nitrogen forms in later stages when the plant is more prone to accumulating nitrates, thereby decoupling growth rate from nitrate accumulation.
Solution Approach 2:
Multiple nutrient parameters are changed systematically: nitrogen form (nitrate vs. ammonium), nitrogen concentration, and calcium oxide levels are adjusted at different growth stages. These parameter changes allow the system to promote growth when needed while preventing nitrate accumulation at harvest-critical stages.
4Productivity
If red light (590-650 nm) intensity is increased to balance photosynthesis, then overall growth is maintained, but glutamine and sugar production is reduced compared to blue light dominance
Solution Approach 1:
The light spectrum is periodically shifted between blue-dominant phases (for glutamine and sugar production) and red-dominant phases (for photosynthetic efficiency and growth). This periodic alternation allows the plant to accumulate metabolic compounds during blue light periods while maintaining overall growth during red light periods, achieving both goals over the complete cycle.
Solution Approach 2:
Blue light exposure is applied in advance during specific growth phases to pre-stimulate the production of glutamine and sugars before harvest, while red light is used during other phases to maintain photosynthetic capacity. The preliminary blue light treatment ensures high nutritional content is established before the final growth phase.
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
This approach significantly increases the glutamine and sugar content in the vegetables, improving their taste and nutritional profile while reducing nitrate concentration, resulting in a healthier and more flavorful product.
Implementation Method 1
The vegetable is grown with first light having a first maximum value of a light intensity in a wavelength range of 420 to 490 nm and including at least portion of light in a wavelength range of 500 to 600 nm in a later part of the second period
Data Source
AI summary
A vegetable production method includes seeding, causing a cotyledon to sprout from a seed in a first period, growing a vegetable in a second period subsequent to the first period, further growing the vegetable in a third period subsequent to the second period, and harvesting the vegetable. The vegetable is grown with first light having a first maximum value of a light intensity in a wavelength range of 420 to 490 nm and including at least portion of light in a wavelength range of 500 to 600 nm in a later part of the second period, and is grown with second light having a second maximum value of a light intensity in a wavelength range of 590 to 650 nm, having a peak light intensity less than the second maximum value in a visible light wavelength range of less than or equal to 500 nm.