Hydroponic production method of selenium-rich lettuce

Abstract

The invention discloses a selenium-rich lettuce hydroponic production method. The method comprises the following steps: step 1, selecting seeds; 2, accelerating germination of the seeds; step 3, spraying water to preserve moisture; 4, seedling raising; 5, field planting and growth; step 6, harvesting lettuce. The selenium-rich lettuce is produced in a hydroponic mode, and compared with soil cultivation, the hydroponic lettuce has the advantages that the yield is high, the growth vigor is strong, space is saved, the hydroponic lettuce is not affected by the natural environment, weeds and diseases and pests are avoided, and nutrition is controllable; by adding trace element selenium necessary for human beings and animals into a hydroponic nutrient solution, lettuce becomes selenium-rich lettuce through a biological enhancement method, so that people can supplement selenium element more safely and effectively at lower cost; according to the method, the device is simple in structure, nutrient solution supplementing and seedling transplanting need manual operation, other operations do not need manual operation, later-period management is convenient, and the final selenium content of the lettuce is 0.06-0.10 mg / Kg by adopting the method.

Description

technical field [0001] The invention relates to the technical field of lettuce planting, in particular to a hydroponic production method of selenium-enriched lettuce. Background technique [0002] Selenium (Selenium) is a non-metallic chemical element of gray, red crystal or red amorphous powder. Its chemical symbol is Se and its atomic number is 34. It belongs to the VIA group of the periodic table. Selenium can enhance human immunity. Essential nutrients, more than 40 countries and regions in the world are selenium-deficient areas, and China is a major selenium-deficient country. As far as the Yunnan-Guizhou Plateau, there is a low-selenium zone in 72% of China's land area, 30% of which are severely selenium-deficient areas, and natural foods such as grains have low selenium content. Large and medium-sized cities such as North China, Northeast China, and Northwest China are all selenium-deficient areas. , in order to improve this situation, how to increase the selenium co...

AI Technical Summary

Problems solved by technology

[0002] Selenium (Selenium) is a non-metallic chemical element of gray, red crystal or red amorphous powder. Its chemical symbol is Se and its atomic number is 34. It belongs to the VIA group of the periodic table. Selenium can enhance human immunity. Essential nutrients, more than 40 countries and regions in the world are selenium-deficient areas, and China is a major selenium-deficient country. As far as the Yunnan-Guizhou Plateau, there is a low-selenium zone in 72% of China's land area, 30% of which are severely selenium-deficient areas, and natural foods such as grains have low selenium content. Large and medium-sized cities such as North China, Northeast China, and Northwest China are all selenium-deficient areas. , in order to improve this situation, how to increase the selenium content in vegetables through artificial intervention has become a topic worthy of research. Based on this, lettuce has obvious economic benefits due to its good taste, high nutritional value and other advantages have become the focus of research. The selenium content in common lettuce is about 0.0115 mg / Kg. In order to increase the selenium content in lettuce, a selenium-enriched The hydroponic planting method of lettuce, through a specific hydroponic method, makes the selenium content in lettuce reach 0.0221-0.0238mg / Kg, and realizes the increase of selenium content, but the increase rate is only about twice the original one. There is a lot of room for improvement, so how to further improve the selenium content of lettuce has become a technical problem to be solved in this application

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