Low Potassium Leafy Vegetable Hydroponic Cultivation
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Solution Overview
Problem
Existing methods for cultivating low potassium leafy vegetables in large-scale hydroponics fail to stably maintain low potassium levels without causing growth disorders such as discoloration, root rot, and reduced weight and height, leading to defective products.
Innovation Solution
Cultivating leafy vegetables using a potassium-containing hydroponic solution for an initial period followed by a low potassium hydroponic solution with 5 to 50 ppm potassium and 20 to 400 ppm sodium, maintaining a consistent EC value of 0.5 to 1.8 and pH of 5.0 to 7.0, and adjusting the cultivation period to 10 to 17 days to prevent potassium deficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If potassium-free hydroponic solution is used for cultivation in the later part of the cultivation period, then potassium content in the vegetable is reduced, but growth disorders occur such as discoloration of the leaf, root rot, and reduced weight and height
Solution Approach 1:
The invention changes the potassium concentration parameter in the hydroponic solution from zero (potassium-free) to a controlled low level (5-50 ppm). This parameter modification allows the plant to maintain essential physiological functions while still achieving low potassium content in the harvested vegetable, thereby resolving the contradiction between reducing potassium content and maintaining growth stability.
2Quantity of substance
If potassium-free hydroponic solution is used for cultivation, then potassium intake for patients is controlled, but defective products are produced that do not satisfy shipping standards
Solution Approach 1:
The invention modifies the potassium concentration parameter from complete absence to a controlled low level (5-50 ppm), which is sufficient to prevent growth disorders and produce marketable vegetables while still achieving the therapeutic goal of low potassium intake for patients.
Solution Approach 2:
Instead of completely eliminating potassium (excessive action), the invention applies partial action by providing a small but sufficient amount (5-50 ppm) that prevents growth disorders while still achieving low potassium content in the vegetable.
3Quantity of substance
If low potassium hydroponic solution is used for cultivation, then potassium content is reduced to about 1/3 to 1/4 of normal cultivation, but weight and height of the vegetable are reduced
Solution Approach 1:
The invention optimizes the potassium concentration parameter to a specific range (5-50 ppm) that balances potassium content reduction with maintaining adequate plant growth, avoiding the excessive reduction that occurs with potassium-free solutions.
Data Source
AI summary
Provided is a method for cultivating low potassium leafy vegetables at high yield without causing growth failure due to potassium deficiency in hydroponics. Cultivation is performed using a hydroponic solution containing a very small amount of potassium in the late cultivation period of low potassium leafy vegetables, thereby keeping the potassium content low at the time of harvest and also allowing the leafy vegetables to be stably harvested at high yield without causing potassium deficiency.