What do you mean by irrigation?

Question 1: What does irrigation mean? Pass.

1. Irrigation principle Irrigation amount, irrigation times and time should be determined according to the water demand characteristics, growth stage, climate and soil conditions of medicinal plants, and irrigation should be timely, appropriate and reasonable.

2. Irrigation types mainly include pre-sowing irrigation, seedling promotion irrigation, growth irrigation and winter irrigation.

3. Irrigation methods include furrow irrigation, border irrigation, sprinkler irrigation, drip irrigation, infiltration irrigation and irrigation.

(1) furrow irrigation method is to open furrows between ridges for irrigation, and the distance and width of irrigation ditches should be determined according to the row spacing of plants and soil texture. Trench irrigation is suitable for medicinal plants with wide row spacing, such as belladonna, perilla and angelica dahurica. The advantages of furrow irrigation are lateral infiltration of soil, little damage to soil structure, loose surface layer and high water use efficiency.

(2) Border Irrigation This method is to introduce irrigation water into the border ditch to make the water flow gradually penetrate into the soil. Border irrigation method is suitable for close planting and flat planting of medicinal plants such as safflower and glehnia littoralis. Disadvantages are uneven irrigation, large evaporation after irrigation, easy to destroy the aggregate structure of the surface soil into layers, and no ventilation, which affects the decomposition of aerobic microorganisms in the soil. Therefore, after irrigation, it is necessary to combine intertillage and loosening the soil.

(3) Sprinkler irrigation and drip irrigation are new irrigation methods developed in recent years, which have the advantages of sprinkler irrigation, small and uniform fog spots, hard surface, water saving and labor saving. Drip irrigation is to let irrigation water drip out slowly and soak the soil at the root of crops, which can adapt to complex terrain, especially in arid and water-deficient areas.

(4) watering with watering can or hose is only suitable for cultivating small areas of medicinal materials, but it is widely used in seedling raising in sunny beds.

4. Development history of irrigation and drainage projects in China.

China is a big agricultural country with a large population, little arable land, water shortage and frequent floods and droughts. The special climate, geography and other natural and social conditions determine that China agriculture must take the road of irrigation agriculture development.

China is the earliest country engaged in agriculture and water conservancy construction in the world. As early as 5,000 years ago in the Dayu era, there were contents of farmland water conservancy, such as "trying to ditch the river", "obstructing the nine rivers and cultivating the nine rivers", and there were ditches in the mineral fields of Xia and Shang Dynasties for irrigation and drainage facilities. During the Western Zhou Dynasty, there were many small-scale irrigation projects in Guanzhong area of the middle reaches of the Yellow River, such as "meaning to irrigate rice fields with muddy water from the tributaries of the Weihe River". During the Spring and Autumn Period and the Warring States Period, China changed from a slave society to a feudal society. Due to the improvement of productivity, a large amount of land has been reclaimed, and irrigation and drainage have also developed accordingly. For example, Wei Ximen Bao built 12 canals in Ye Jun (now Linzhang, Hebei) to irrigate farmland and improve saline-alkali land; Shao Bei, a water storage irrigation project in Shouxian County, Anhui Province; Li Bing, the prefect of Shu County of Qin State, presided over the construction of Dujiangyan, making Chengdu Plain a "land of abundance".

Qin and Han Dynasties was the first period of national unity and national strength in China, and it was also the first period of great development of irrigation and drainage projects. Especially in the early Western Han Dynasty, water conservancy construction greatly promoted the social and economic development at that time. Zheng Guoqu (built in 246 BC) was an irrigation project built before Qin Shihuang unified the six countries. At that time, it claimed to irrigate 40,000 hectares of land, making Guanzhong the earliest basic economic zone in China, so "Qin Fuqiang died as a vassal." During the reign of Emperor Wu of the Han Dynasty, the Wei River was diverted to open canals, which were used for both water delivery and irrigation. Later, Longshou Canal of Beiluo River, Baijing Canal of Shuijing River and Guo Cheng Canal of Weihe River were built. In the Han Dynasty, in addition to the irrigation projects in the Weihe River and Fenhe River basins, some large-scale canal water diversion projects were built in the Hexi Corridor in the northwest frontier and the Hetao area of the Yellow River in order to consolidate the frontier defense and garrison the frontier.

The second development period of irrigation and drainage project in China was from Sui and Tang Dynasties to Northern Song Dynasty. In the early years of the Tang Dynasty, Chang 'an was its capital, and the irrigation and drainage project in Guanzhong was greatly developed. After the Anshi Rebellion, a large number of people moved south, and farmland water conservancy in Jiangsu and Zhejiang provinces developed rapidly. A large number of dikes have been built along the banks of the river, rice is planted through drainage, and pond weir irrigation is more common. At the same time, water lifting tools have also been improved and popularized, expanding the irrigation area of farmland. By the late Tang Dynasty, the tax revenue of Taihu Lake had surpassed that of the Yellow River Basin, becoming a new basic economic zone. By the Northern Song Dynasty, the proportion of the population in the Yangtze River basin had risen from less than 20% in the Western Han Dynasty to more than 40%. Song Shenzong supported Wang Anshi's political reform and promulgated the Treaty on Farmland Rights and Interests (also known as the Restriction Order on Farmland Water Conservancy), which was the first farmland water conservancy decree officially promulgated by the central government. At the same time, it also set up a palace history in charge of farmland water conservancy in all walks of life throughout the country, further developing farmland water conservancy construction. The Southern Song Dynasty was biased ... >>

Question 2: What does irrigation mean? Irrigation means watering the land with water.

[guàgàI]

irrigate

Irrigation means watering the land with water.

[guàgàI]

irrigate

Question 3: What does irrigation mean? First: Jacky Cheung.

From June to September, 1 1990, Jacky Cheung's songs such as "Love You More Every Day" and "Love Only One Person in My Life" were very popular in Hongkong, Japan and other places, setting a record of platinum sales in Jacky Cheung.

From 65438 to March 0992, Jacky Cheung was praised as the first of the four kings by the media in Hong Kong, Taiwan and Chinese mainland.

1in the spring of 992, Jacky Cheung released his solo album "Revealing the Truth", which received rave reviews and achieved platinum sales again.

/kloc-in the summer of 0/993, Jacky Cheung released his solo album "Kiss Goodbye", which sold 4 million worldwide, breaking the Chinese record holder of Teresa Teng's "Sweet Honey".

During the period of 1994, Jacky Cheung released five albums, all of which were platinum.

1994 in may, Andy Lau publicly revealed that he wanted to buy Jacky Cheung's CD most, because Xueyou's magnetic voice and background were the best!

1994 1 1 Jacky Cheung is called a true friend, and Guo thinks that Jacky Cheung is rare in the whole circle.

1February 1995 Jacky Cheung's new album became platinum again.

1August, 1995, after leaving, the album broke the fortune and became the second standard-bearer of record sales in Jacky Cheung.

1September 1995 17 The first Asian singer to attend the World Music Awards Ceremony was born, that is, Jacky Cheung, who won the highest-selling Chinese singer in the world and the most popular Chinese singer in non-Chinese speaking areas.

1996 "I can't forget you" sold more than Teresa Teng's "Sweet Honey" and Alan Tam's "Love in Late Autumn", ranking second in China's record sales history (the first place was "Kissing Goodbye").

Jacky Cheung attended the World Music Awards Ceremony again in September, 1996, and accepted the top ten most watched singers in the world.

Xuelang Lake was officially released on 1997. This opera has won numerous awards in Hong Kong and Singapore, and its influence is comparable to that of the American blockbuster Tani.

1999 Jacky Cheung held a world tour concert, which once again set a new Chinese record with the largest audience and the largest number of consecutive openings.

1999, Jacky Cheung won the honor of "Top Ten Outstanding Youth in the World". Previously, Jackie Chan was 1988' s "Top Ten Outstanding Youth in the World".

2003-05-28 In recognition of Jacky Cheung's record sales exceeding 40 million rings, Mr. Qiu Dong personally planted and presented him with a 6-foot-high gold microphone, which meant that he surpassed the status of the music emperor. For decades, there have been countless romantic figures in Hong Kong's music scene. Only he is the only imperial superstar who can cross the past, present and future.

Question 4: What does irrigation mean _ Baidu homework help Irrigation

Guàn irrigation: irrigation, canal irrigation and irrigation.

irrigate

Gài irrigation: irrigation. Washington State

Technical measures to replenish water needed by crops for land. In order to ensure the normal growth of crops and obtain high and stable yield, it is necessary to provide sufficient water for crops. Under natural conditions, it is often because of insufficient precipitation or uneven distribution that the water demand of crops cannot be met. Therefore, artificial irrigation must be carried out to make up for the shortage of natural rainfall. [ 1]

Question 5: What does this idiom mean? First of all, pumping irrigation is not an idiom, but a phrase.

Pumping irrigation is defined as follows:

Draw water: pinyin jí shuǐ explanation: draw water from the bottom up.

Irrigation: Artificial facilities are used to transport water meeting quality standards to farmland, grassland, woodland and other places to supplement soil moisture and improve plant growth and development conditions. The main object of irrigation is crops, so it is also called crop irrigation or farmland irrigation.

The combination of pumping and irrigation is: pumping (taking) water to irrigate farmland (grassland/woodland).

In addition, there are many tools and methods of pumping water. See the picture.

1. Pulley: Lù Lu-a lifting device that uses the principle of shaft to pump water on the well.

2. Boom —— China called orange in ancient times, which is a primitive tool for pumping water on the well.

Principle: It is to add a slender lever to the upright shelf, with a fulcrum in the middle, a heavy object hanging at the end and a bucket hanging in front. When you fall together, pumping water saves effort. When people put the bucket into the water and fill it with water, they can easily lift the water to the required position due to the gravity at the end of the lever. As early as the Spring and Autumn Period, dried tangerine peel was quite common and lasted for thousands of years. It is an old-fashioned water lifting device widely used in rural areas of China. Although this simple pumping tool is simple, it can reduce the labor intensity of working people.

3. Dumper is one of the most famous agricultural irrigation machinery in ancient China.

Description: Rollover can be driven by hands, feet, cows, water or wind. Keel blades as a chain, lying in a long rectangular slot, leaning against the river or pond. The lower sprocket and a part of the car body are submerged. When the sprocket is driven, the blade will wipe up along the groove and send water to the upper end of the long groove. This kind of continuous circulation can transport water to the place where it is needed and continuously take water, which greatly improves the efficiency, facilitates the operation and transportation, and transfers the water intake point in time, which can be used for irrigation and drainage. The earliest application of chain drive in ancient China was rollover, which was a great improvement of agricultural irrigation machinery.

4. bathtub car-also known as "water-to-bathtub car". A water-powered tool for water intake and irrigation, also called "water-turning drum car".

According to historical records, the tube car was invented in the Sui Dynasty, superior to the Tang Dynasty, with a history of 1000 years. This kind of ancient tube car, which is automatic by hydraulic power, has formed an ancient pastoral spring color map in the lush Shan Jian and streams in my hometown, which is an outstanding invention of ancient people in China.

Above, for reference!