Where is lettuce a specialty, and what are the types and varieties of lettuce?

Lettuce has many aliases, such as: spring vegetables, raw bamboo shoots, goldenrod, stem lettuce, green bamboo shoots, lettuce, fragrant horse bamboo shoots, etc.

Details of Lettuce:

One: Lettuce Origin:

Lettuce is native to Central or North China.

The above-ground stems are edible, the bark of the stem is white-green, the flesh of the stem is brittle and tender, and the young stems are emerald green, which turn white-green when mature.

2. The main varieties of lettuce are:

Willow leaf lettuce, Beijing purple leaf lettuce, Shaanxi sharp leaf white bamboo shoots, Chengdu sharp leaves, Chongqing Wannian pile, Shanghai sharp leaves, Nanjing white skin incense early seeds, etc.

Three: Nutritional value of lettuce:

The meat of lettuce is delicate and tender, and it is suitable for raw and hot stir-frying. Eating lettuce regularly can enhance the secretion of gastric juice and digestive juices, and increase the secretion of bile. The potassium in lettuce is 27 times that of sodium, which is good for promoting urination, maintaining water balance, and is of great benefit to people with high blood pressure and heart disease.

The fluorine element contained in lettuce can be involved in the formation of tooth enamel and dentin, and participate in the growth of bones. Lettuce is high in iodine, which has a beneficial effect on the body's basal metabolism and physical development. The nutrition of lettuce leaves is much higher than that of lettuce stems, and the leaves contain more than 72 times more carotene than their stems, vitamin B1 is 2 times, vitamin B2 is 5 times, and vitamin C4 is 3 times, so it is a pity that lettuce leaves are discarded and not eaten.

In addition, people who love to suffer from cough in autumn can also calm the cough by eating more lettuce leaves.

Four: Nutrient content of lettuce:

Calories (kcal).

Protein (g).

Fat (g).

Carbohydrates (grams).

Dietary fiber (g).

Vitamin A (mcg).

Carotene (mcg).

Thiamine (mg).

Riboflavin (mg).

Niacin (mg).

Vitamin C (mg).

Vitamin E (mg).

Calcium (mg).

Phosphorus (mg).

Sodium (mg).

Magnesium (mg).

Iron (mg).

Zinc (mg).

Selenium (mcg).

Copper (mg).

Manganese (mg).

potassium (mg)).

Where is the most green lettuce produced?

Lettuce is an annual or biennial vegetable of the Asteraceae family, native to the Mediterranean coast, and prefers cold, cool and humid climatic conditions. According to the edible part, it can be divided into leaf lettuce and stem lettuce. Leaf lettuce, also known as lettuce, is cultivated more in Guangdong and Guangxi.

Stem lettuce is lettuce, adaptable, widely cultivated in the north and south of China, in the Yangtze River basin is one of the main vegetables in the spring off-season in March and May, Sichuan climate is warm and humid, suitable for lettuce growth, plus lettuce is not very strict with the cultivation season requirements, high yield, diverse food methods, so it is widely distributed in Sichuan, and occupies a very important position in the vegetable cultivation system and vegetable balance.

1) Types of lettuce.

Lettuce can be divided into two types: leaf and stem.

Leaves with lettuce leaves for the root leaves, leaf color for dark green or light green or purple red, etc., the leaf surface is smooth or wrinkled, the whole edge or there is a notch, the ball is called loose leaf lettuce, and the ball is called ball lettuce.

Lettuce for the stems is lettuce, the leaves are narrow, the apex is pointed or rounded, the stem is hypertrophied, and the staple food part. There are many varieties of lettuce, which are often named according to leaf shape, leaf color, stem color or ripeness.

2) The main cultivars cultivated in Sichuan.

Early-maturing varieties mainly include two white skin dense knots, two white skin scar, green hemp leaves, tight leaves, water white stripes and other varieties.

Medium and late maturing varieties mainly include two green skins, hanging silk red, pointed leaf white nails, 10,000 years of piles and other varieties.

There are many local varieties of Sichuan lettuce, such as red horse ear, double tip, umbrella stick, a little red, round-leaved white armor, Fuling chicken pecking leaves, Yibin two white skin, etc. are also available.

Lettuce originated in the Mediterranean Sea around 4500 BC.

Lettuce was introduced to China in the 5th century AD, and Sanjie Town, Pengzhou City, Sichuan Province was awarded the title of "Hometown of Lettuce Specialties in Sichuan Province" by the relevant departments. There are five stages in the whole growth process of lettuce, which are seed germination stage, seedling stage, rosette stage, fleshy stem formation stage and flowering and fruiting stage.

Lettuce has strong adaptability and can be cultivated in spring and autumn or overwintering, mainly in spring, and is one of the most common vegetables on the table. The skin of the stem of lettuce is whitish-green, the neck flesh is crisp and tender in the early stage, then turns emerald green in the middle stage, and turns to white-green when ripe. Lettuce is 25 to 100 cm tall and grows vertically downwards with the stems standing upright and the upper branches spreading out in all directions.

The growth habit of lettuce

Lettuce is a very cold-tolerant vegetable, likes a cool climate, is not resistant to high temperatures, and can only grow faster and better when the soil surface is fully hydrated, and needs to be continuously supplied with water. In addition, lettuce has a greater demand for fertilizer for the soil, and likes to grow in soil rich in organic matter, while lettuce prefers slightly acidic soil and grows more vigorously in slightly acidic soil.

Lettuce grows more vigorously in areas with a large temperature difference between day and night, such as the Turpan Basin in Xinjiang, where the germination of lettuce must exceed 30 degrees Celsius, the growth temperature of seedlings is 15 degrees Celsius, and the temperature required for flowering and setting is relatively high.

Lettuce is native to the Mediterranean coast.

Lettuce originated in the Mediterranean in 4500 B.C., introduced to China in the 5th century, China's lettuce production area is the first to promote Hebei, in Shandong and other provinces of the country have lettuce planting. In addition, lettuce for leaves is commonly cultivated in countries around the world, mainly in Europe, America, Asia and Taiwan.

Lettuce and lettuce are loved by people because of their refreshing taste and rich nutrition. But strictly speaking, lettuce and lettuce are not a vegetable, lettuce is not lettuce, and lettuce can be called lettuce. Because the lettuce I usually talk about is actually lettuce, a type of lettuce, which mainly eats leaves.

Lettuce is also a kind of lettuce, mainly eating stems, so lettuce is a general term for this type of vegetable, and lettuce is only a sub-order under this general heading, not a different name for the same vegetable.

Main varieties of lettuce:

According to the shape of the lettuce leaves, it can be divided into two types: pointed leaves and round leaves, and according to the color of the stem, there are white bamboo shoots (green and white skin), green bamboo shoots (light green with large skin in the hall) and purple bamboo shoots (purple green).

The leaves are lanceolate, apex pointed, the leaf clusters are small, the internodes are sparse, the leaf surface is smooth or slightly wrinkled, green or purple in color. The fleshy stem is rod-shaped, thick at the bottom and thin at the top. It is late maturing, the seedling stage is more heat-tolerant, and can be cultivated in autumn or overwinter.

The main varieties are: willow leaf lettuce, Beijing purple leaf lettuce, Shanghai sharp leaf, Nanjing white skin incense early species, etc.

Lettuce is originally grown along the shores of the Mediterranean.

Lettuce (scientific name: lactuca sativa angustanairish), lettuce genus in the Asteraceae family.

Native to the Mediterranean coast. Lettuce seeds can form varieties of fleshy tender stems, one- and two-year-old herbaceous plants. The skin of the stem is white-green, the flesh of the stem is brittle and tender, and the young and tender stems are emerald green, which turn white-green when mature.

The leaves are alternate, lanceolate or oblong, etc., and the color is light green, green, dark green or purplish-red.

The shape of the stem is circled and circled, like bamboo shoots. Straight roots, most lateral roots occur after transplantation, shallow and dense, mainly distributed in 20-30 cm soil layer. Stem shortening.

The leaves are alternate, lanceolate or oblong-ovate, and the color is light green, green, dark green or purplish-red, the leaf surface is flat or wrinkled, and the whole margin may be notched.

The short stem gradually elongates and thickens with the growth of the plant, and after the stem end differentiates the flower bud, the stem grows thicker at the same time as the flower stem elongates, forming a rod-like fleshy tender stem. The flesh is pale green, emerald green or yellow-green. Conical head-shaped inflorescences, each with about 20 flowers, self-pollinating, sometimes cross-pollination.

achenes, black-brown or silvery-white, with crown hairs.

Introduction to the types of lettuce:

Lettuce can be divided into two types: pointed leaves and round leaves according to the shape of the lettuce leaves, and there are white bamboo shoots, green shoots and purple shoots according to the color of the stem.

Leaf lettuce: leaves lanceolate, apex pointed, leaf clusters small, internodes thin, leaf surface smooth or slightly wrinkled, green or purple color. The fleshy stem is rod-shaped, thick at the bottom and thin at the top. It is late maturing, the seedling stage is more heat-tolerant, and can be cultivated in autumn or overwinter.

The main varieties are: willow leaf lettuce, Beijing purple leaf lettuce, Shaanxi sharp leaf white bamboo shoots, Chengdu sharp leaves, Chongqing Wannian pile, Shanghai sharp leaves, Nanjing white skin incense early seeds, etc.

Round-leaved lettuce: the leaves are long obovate, the top is slightly rounded, the leaf surface is more wrinkled, the leaf clusters are larger, the internodes are dense, the stem is thick (the middle and lower parts are thicker, and the ends are tapered), the maturity period is early, the cold tolerance is strong, it is not heat-resistant, and it is mostly cultivated as wintering spring lettuce.

The main varieties are: Beijing crucian gourd bamboo shoots, Chengdu hanging silk red, two white skin, two green skin, Jinan white lettuce, Shaanxi round leaf white bamboo shoots, Shanghai small round leaves, large round leaves, Nanjing purple skin incense, Hubei Xiaogan lettuce, Hunan gong hammer lettuce, etc.

Asparagus belongs to Shandong's specialty, the asparagus here is generally the best, its listing time is about September, its ** is generally 10 yuan a catty, the asparagus here is generally darker. Generally, the asparagus market time is between September and October every year, it is mainly listed in autumn, the origin of general asparagus is Shandong, and the common production areas are Jiangsu, Guangdong, Jiangxi, Youkai Zhejiang and other regions.

The origin of the specialty asparagus.

Generally, the market time of asparagus is between September and October every year, it is mainly listed in autumn, the origin of general asparagus is Shandong, and the common production areas are Jiangsu, Guangdong, Jiangxi, Zhejiang and other regions.

Asparagus belongs to Shandong's specialty, the asparagus here is generally the best, its market time is probably good to answer in September, it's ** is generally 10 yuan a catty, the asparagus here is generally darker in color.

Asparagus varieties. The varieties of asparagus are Grande, Mianzhu No. 1, French all-male asparagus, Mary Washington 500w, etc., generally Grande is the best taste, its color is dark green, the price is about 8 yuan to 10 yuan a catty, it is very crisp to eat, and there is a light fragrance.

The efficacy and role of asparagus.

The nutritional value of asparagus is very high, generally rich in vitamins, folic acid, selenium, iron, etc., which can properly supplement the amino acids required by the human body, and the selenium content of asparagus is relatively high in vegetables, so it is a vegetable that is very suitable for eating.

Asparagus planting and harvesting time.

Asparagus generally likes light, it needs to be planted in a warm place, and it needs to be supplemented with light in time during the growth process.

Asparagus is generally planted in March to April of each disturbing year, and it can bloom in half a year after planting, and its market time is generally between August and September, with a yield of 2,000 to 3,000 kg per mu.