Low-potassium lettuce capable of quantitatively controlling potassium content and cultivation method and cultivation system of low-potassium lettuce

By preparing conventional potassium-containing and potassium-free nutrient solution mother solutions in soilless cultivation, calculating the switching threshold based on the fresh weight of the plants, and using high-multiple dilution technology and an online monitoring control unit, the problem of large fluctuations in the potassium content of vegetables was solved, and precise and stable control of the potassium content of lettuce was achieved, thereby reducing production costs and improving the repeatability and standardization of production.

CN120694153AActive Publication Date: 2025-09-26SHANGHAI ACAD OF AGRI SCI
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Patent Information

Application Number
CN202511032924.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-25
Publication Date
2025-09-26
Estimated Expiration
2045-07-25

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately and stably control the potassium content of vegetables in soilless cultivation, resulting in large fluctuations in potassium content and the inability to form standardized products. Conventional methods are also costly and complex to operate, making them difficult to promote in conventional production systems.

Method used

A cultivation method of quantitatively controlling potassium content is adopted. By preparing conventional potassium-containing and potassium-free nutrient solution mother solutions, calculating the switching threshold according to the fresh weight of the plant, using high-multiple dilution technology, and combining online monitoring and control units, precise control of potassium content can be achieved.

Benefits of technology

Under the premise of ensuring yield and quality, the potassium content of lettuce is stably controlled, production costs are reduced, and the repeatability and standardization of production are improved, making it suitable for batch production of multiple varieties and specifications.

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Abstract

The invention discloses a low-potassium lettuce capable of quantitatively controlling the potassium content and a cultivation method and system thereof, and the method comprises the steps: preparing conventional potassium-containing and potassium-free high-power concentrated mother liquor, diluting the mother liquor in proportion, and continuously supplying a potassium-containing nutrient solution in the early stage of plant growth; when the fresh weight of the whole plant reaches a potassium cut-off threshold value calculated by the potassium content of the target fresh sample, the potassium content of the conventional lettuce and the fresh weight of the overground part, accurately switching to a potassium-free nutrient solution until harvesting; meanwhile, in the potassium-free stage, equimolar sodium salt / calcium salt is used for replacing sylvite to maintain conductivity and ion balance, and fine regulation and control of EC of 1.3-1.5 mS / cm and pH of 5.5-6.5 are matched, so that root system health and yield quality are ensured. The system does not need a special light source or a temperature control facility, is suitable for deep liquid flow, shallow liquid flow and aeroponic cultivation of multiple soilless platform lettuce production, stably realizes 100 + / -10mg / 100g (fresh sample) low-potassium products among batches, and has the advantages of simplicity and convenience in operation, high repeatability and high industrial popularization value.
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