Liantang White

Liantang White

Lianyungang White, a specialty of Qingpu District of Shanghai, China's geographical indication products. It is mainly produced in the districts of Liantang, Zhujiajiao and Jinze. Qingpu District is surrounded by lakes, rivers, waterways, water quality, fertile soil, unique natural conditions, has always been planting water chestnuts, white, arrowhead and other aquatic crops. Especially in Liantang Township, it is the township with the largest area and the highest yield in the eastern part of China. It has the reputation of “the first town in the eastern part of China”. The white glutinous rice produced has the characteristics of "fresh, sweet and tender". It has a delicious taste and sweet taste. It is listed as a treasure in the Shanghai suburbs.

Qingpu District of Shanghai is located between 120°53'-121°17' east longitude and 30°59'-31°16' north latitude. It is located in the western suburbs of Shanghai, downstream of Taihu Lake and upstream of the Huangpu River. The water area within the territory is 124.49 square kilometers, and the water surface area accounts for 18.6% of the total area of ​​land in the region. It has sufficient conditions for the growth of aquatic crops. In terms of climate, Qingpu District is a subtropical monsoon climate with mild and humid conditions, four distinct seasons, abundant sunshine, abundant rainfall, and a long frost-free period. In 2006, the average temperature of the whole area was about 17.6°C, and the monthly average temperature was about 5.6°C in January, and about 29.8°C in August. The annual frost-free period is 230 days, and the rainfall day is 121 days. The annual precipitation is 990.2 millimeters and the total sunshine duration is 1756 hours. Can meet the growth of white crops. In terms of water resources, Qingpu District is the area of ​​the plain's tidal water network. Under the rivers and rivers under the influence of the tidal waves of the Huangpu River, the rivers and rivers of the two provinces were admitted to the passenger waters of the two provinces, and they eventually entered Puhai, which belonged to the Huangpu River system. There are 1817 river courses, 2155 km in length, and 21 lakes with a total area of ​​59.3 km2. Water resources 15.51 billion cubic meters. Liantang Town, in particular, is located in the lowland of Yodohu Lake. It is surrounded by lakes, rivers and rivers, and waterways all over the country. The water quality is good, and the soil is fertile. The natural conditions are unique.

Liantang White has the characteristics of “fresh, sweet and tender”. It tastes sweet and sweet. It can be eaten as fruit. It is rich in nutrients and has a high cellulose content. It is beneficial to clean up the stomach and the stomach. Changbai is listed as a treasure in the Shanghai suburbs and has the reputation of "water ginseng."

Quality requirements

(a) Variety.
Local excellent white varieties.
(b) site conditions.
The soil type is cyanotic mud, soil texture is clayey soil, organic matter content is ≥2%, soil layer thickness is >1m, and pH value is 6 to 7. The water quality meets the requirements of the national second-level surface water environmental quality standards.
(c) Cultivation and management.
1. Selection and nursery:
Use asexual ramets to reproduce. Preliminary elections during the fall pregnancy period are repeated at the end of harvest.
The varieties planted in the spring were selected to retain seedlings of 5,000 to 6,000 per hectare. During the period from late December to early January, the soil of the piers was excavated and arranged in a seedbed with a spacing of 100 px to 150 px.
The varieties planted in summer were selected to maintain seed piers of 150 to 230 per hectare, and seedlings were planted at the end of March to early April with 110,000 plants/ha.
2. Colonization:
(1) Site preparation: Before the planting, compost organic fertilizer was applied at 30 tons/ha to 37.5 tons/ha.
(2) Time for planting: The time for planting in spring is from late March to early April, and from early June to late July in the summer.
(3) Density of planting: Density of spring planting ≤ 70,000 plants/ha and density of planting in summer ≤ 14,000 plants/ha.
3. Field Management:
(1) Water Management:
The early stage of spring colonization should maintain a shallow water layer of 75 px to 100 px, and the water layer should be maintained at 200 px to 375 px from mid-July to early August, and from 625 px to 750 px in the middle of August.
After planting in summer, the water layer should be maintained at 250px to 375px. After survival, the water layer will be gradually reduced to 75px to 100px, and during the pregnancy period, the water layer will be maintained at 625px to 750px.
(2) Fertilizer management: 10 to 15 days after planting, each of the top dressings during the gestation and winter seasons, and the second half of the second trimester.
(3) Medication management: During the first half of the month after the harvest, the medication was stopped.
4. Environment and safety requirements: The use of pesticides, fertilizers, etc. must comply with the relevant national regulations and must not pollute the environment.
(d) Harvesting.
When the white leaf is shortened and the fleshy stem is significantly enlarged, it can be harvested. After harvesting, cleaning should use qualified water sources. After cleaning, the leaves and fistulas were removed, and they were listed on the market or stripped of all the leaves.
(five) quality characteristics.
1. Sensory features: Semi-glossy silk cords are clean and compact, and the light body is white and thick; the meat is crisp and sweet and slightly sweet.
2. Physical and chemical indicators:

project
index
Half weight ≥
100g
The diameter of the largest part of the diaphragm ≥
75px
Total sugar ≥
2.0%
Crude fiber ≤
1.5%
Total amino acids ≥
0.8%

3. Safety requirements: Product safety indicators must meet the relevant national regulations for similar products.

练塘茭白

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