Open the “Linxia Hui Autonomous Prefecture†and “Ji Shi Shan County Chronicleâ€. In the color pictures arranged in front of the book, there is a color photo of the titles “Thin Walnut†and “Dhejia Eggshell Walnut†and other local specialties. Photos are arranged together. In the photo, the walnuts in the dish were smooth and shells were broken. The shells were full of light yellowish walnuts. The shells were thin and there was no sandwich between the peach kernels. This is the famous Dahejia egg skin walnut. "Linxia Hui Autonomous Prefecture Zhizhi Forestry Journal" wrote: "Ohehe walnut planting resources are abundant, according to the provincial and state fruit tree resources survey in 1964: There are yellow June, 0, egg skin, duck eggs, stone, cotton walnut, large Triangular, small triangular, firewood, etc. Egg skin walnut is best known."
Walnuts also known as walnuts, walnuts, deciduous trees, tree height 20-40 meters, canopy coverage up to 400-1200 square meters, early summer flowering, unisexual, monoecious, catkin drooping, stone fruit called oval or spherical. Ren is rich in oil, delicious alcohol, can be eaten, squeezed oil, can also be used as medicine, warm and sweet, functional warm Pei kidney, Indicated as Cold Cough, kidney back pain embolism. Rich in nutrition, it is a top product. Jishi pecan planted over 2,000 years of history, each township is cultivated, many varieties, the annual output of about 100,000 kilograms, but the Dahejia town, the most famous for egg skin of Sibaozi township, this walnut shell is smooth and thin, like "Egg skin" can be broken by hand with a pinch, it is easy to break off the kernels, and the mellow fat is sweet, with good quality and high kernel rate. The yield is higher and the yield per plant can reach 90-120 kg. However, there are not many fruit-bearing trees and there is no scale. Products are in short supply. In recent years, the Autonomous County has attached great importance to supporting the development of such local specialties. It has established about ten acres of nurseries at Dahejia and Sibaozi, and can produce more than 2,000 plants each year. More than 500 acres of planting, believe that egg walnut walnuts this local specialty will certainly become a competitive product in the characteristic economy. ("The History of Ji Shi Shan" Dong Keyi)
Dahejia egg skin walnuts are produced in 9 townships of Dahejia Town, Liuji Township, Shiqian Township, Liugou Township, Guanjiachuan Township, Hulinjia Township, Anji Township, Yinchuan Township, and Puchuan Township in Jishi County of Gansu Province. Administrative jurisdiction.
One, variety
Local native walnut varieties.
Second, site conditions
Within the range of production area, the altitude is from 1700m to 1950m. The soil is black soil and red soil. The soil pH value is 6.3 to 8.2, the organic matter content is ≥1%, and the soil thickness is ≥1m.
Third, cultivation and management
1. Seedlings: Grafted seedlings with common seedlings as rootstock.
2. Colonization: Planting time is from mid-to-late April. Plant spacing between rows of plants is 6×8m or 8×9m, and ≤139 plants per hectare. Pure garden cultivation uses 3×5m or 4×6m, and ≤417 plants per hectare. .
3. Fertilization: organic fertilizer is the main method. Each year, the saplings use 15 kg of decomposed organic fertilizer per plant; the first-fruit period trees use 25 kg of decomposed organic fertilizer per tree per year; and the fruit trees use 35 kg of decomposed organic fertilizer per year per tree.
4. Pruning: The branches in the crown are evenly distributed to ensure ventilation and light transmission.
5. Fresh fruit harvest: When the whole plant more than 1/3 of the natural cracking fruit can be harvested.
6. Environment and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment.
Fourth, processing
1. Peel the skin: Do not peel on the day of harvesting. Peel immediately after stacking.
2. Drying: Dried or dried until the moisture content of the nut is ≤ 8%.
Fifth, quality characteristics
1. Sensory features:
Fruit Shape Shell Features Shell Color Seed Color Taste
Oval sutures are tight, fruit surface smooth yellowish yellow and white sweet
2. Physical and chemical indicators:
Fruit weight (g) Shell thickness (mm) Peeling rate (%) Fat content (%) Protein content (%)> 8.0 1.0 to 1.6 50% to 60% >52 >16
3. Safety and other quality and technical requirements: Product safety and other quality and technical requirements must comply with relevant national regulations.
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