A kind of cultivation method of selenium-enriched lettuce

Abstract

The invention provides a cultivation method for selenium-enriched lettuce. The cultivation method comprises the following steps: 1) performing water culture on lettuce seedlings with a first water culture nutrient solution for 7-14 days so as to obtain lettuce plantlets, wherein the selenium content in the first water culture nutrient solution is 0.1-0.2mg / L; 2) performing water culture on the lettuce plantlets obtained in the step 1) with a second water culture nutrient solution for 7-21 days, wherein the selenium content in the second water culture nutrient solution is 0.3-0.5mg / L; 3) performing water culture on the lettuce plantlets obtained in the step 2) with the first water culture nutrient solution. According to the cultivation method for selenium-enriched lettuce provided by the invention, the lettuce is subjected to selenium-enriched water culture, the selenium-enriched ability is strong, and pollution to soil and pollution of heavy metals in the soil to vegetables can be reduced.

Description

technical field [0001] The invention relates to the technical field of hydroponic cultivation, and more particularly, to a cultivation method of selenium-enriched lettuce. Background technique [0002] Selenium is an essential micro-multifunctional life nutrient for humans and animals. It is respected as "the fire of life" by the medical and nutritional circles at home and abroad. It has multiple functions such as anti-cancer, anti-oxidation, and immunity enhancement. According to expert research, people need lifelong selenium supplementation, and medicine supplementation is not as good as food supplementation. Studies such as Finley also showed that eating biological selenium is the safest and most effective way to supplement selenium. [0003] As a necessity of daily diet, vegetables play a pivotal role in the daily life of residents. More importantly, vegetables play a crucial role in the natural selenium cycle ecological chain and the conversion of inorganic selenium i...

AI Technical Summary

Problems solved by technology

At present, the commonly used selenium-enriching methods for vegetables are: (1) applying selenium to the soil, directly applying selenium fertilizer to the soil, absorbing and metabolizing selenium through plant rhizomes, and improving the selenium content in crops, but applying selenium to the soil will pollute the soil and cannot be achieved Ecological requirements

(2) Selenium seed dressing, smear selenium-containing nutrient solution or selenium fertilizer on the plant seeds, and then increase the content of selenium in the product, but the amount of selenium used in this method is about 20 times more than that of foliar spraying, and the selenium mixed Plants will pollute the soil to a certain extent, and the selenium content in crops cannot be quantitatively controlled within a certain range, which cannot effectively ensure food safety.

(3) Selenium fertilizer is injected into the stalk, this method is too troublesome for agricultural production and cannot be promoted

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