Tundra is rich in carbohydrates, protein, crude fiber and minerals, but also contains fat and vitamins. In the tundra protein, a complete range of amino acids, essential amino acid content is high, which rim tube tundra limiting amino acid lysine, amino acid score of 79; strip tundra limiting amino acid methionine, amino acid score of 80.

Lettuce is rich in nutrients, especially in the leaf is higher. Every 500 grams of fresh lettuce leaves, containing 10 grams of protein, 2.5 grams of fat, 16.5 grams of carbohydrates, 190 milligrams of calcium, 185 milligrams of phosphorus, 5.5 milligrams of iron, 10.7 milligrams of carotenoids, vitamin B20.6 milligrams of vitamin C75 milligrams and so on. But in the stem content is much lower, every 500 grams of lettuce stems, containing only 1.5 grams of protein, fat only 0.2 grams, carbohydrates only 4.7 grams, carotene and vitamin C content is very small.

2, the efficacy of different:

The moss lettuce is salty and cold in nature, with a soft and dispersive, clearing heat and detoxification effect.

Lettuce taste fresh and slightly bitter, can stimulate the secretion of digestive enzymes, enhance appetite. Its milky pulp, can enhance gastric juice, secretion of digestive glands and bile secretion, thus promoting the function of the digestive organs; lettuce contains a variety of vitamins and minerals, has the role of regulating the function of the nervous system, which contains organic chemical content is rich in human body can be absorbed in iron, iron deficiency anemia patients are very beneficial.

3, different growth environments:

Tundra, growing in the tide zone in the rocky marsh.

Lettuce is sensitive to the acidity and alkalinity of the soil, suitable for planting in slightly acidic soil. Lettuce has a shallow root system, weak absorption capacity, high oxygen requirements, planting lettuce in sandy loam, loamy soil is preferred.