What does a walnut look like?

Walnut belongs to the walnut family Walnut is a deciduous tree, endocarp hard, wrinkled, yellowish brown. The fruit is collected before and after White Dew, the outer skin of the fruit is rotten, the inner fruit is rinsed and dried, and cleaned up, which is what people call "walnut". In fact, this is just a saying. According to archaeological records, walnuts appeared as early as the Neolithic Age or earlier, which proves that China is one of the places of origin of walnuts.

Walnut trees are generally 30-35 meters high, with silver-gray bark. Leaflets 7-11, entire or shallowly serrate, leaf blade abaxially tomentose. The florescence is 4-5 months, unisexual, monoecious, male inflorescences often 20-25 cm, female inflorescences terminal, with 2-5 florets clustered. The fruiting stage is October, and the fruit is nearly globular, 3-5 cm in diameter and pointed at the apex. The exocarp is fleshy, grayish green with brown spots. Endocarp hard, wrinkled, yellowish brown. The bone of the inner next door is well developed, so it is difficult to take benevolence.

Walnut is a temperature-loving tree species, the suitable temperature range and frost-free period are annual average temperature of 916 degrees, extreme minimum temperature of minus 25 degrees, extreme maximum temperature of less than 38 degrees, frost period of less than 150 days. Like light, sufficient light conditions are needed after entering the fruiting period. the sunshine hours of the whole year must be more than 2000 hours to ensure normal growth and development, such as less than 1000 hours of nucleolar shell and nucleolus underdevelopment. daylighting must be considered in garden selection, planting density, cultivation mode, shaping and pruning in cultivation.

The huge roots and trees of walnut first require a deep soil layer (more than one meter) to ensure its good growth and development. It is resistant to dry air, but sensitive to soil moisture, and too dry or too wet soil is not conducive to the growth and fruit of walnut, so soil and water conservation engineering measures should be taken in mountain walnut orchards, while the drainage problem should be solved on flat land. the groundwater level should be below 2 meters below the surface.

Walnut likes loose soil and good drainage, and grows poorly in the soil with high groundwater level and heavy clay, but grows best in the slightly alkaline soil containing calcium. The adaptive range of soil PH value is 6: 8, and the soil salt content should be less than 0.25%. If it exceeds slightly, it will affect the growth and fruit. if the salt content is too high, it will lead to death and like fertilizer.

The producing areas of walnut are mainly distributed in some mountainous areas of Hebei, Tianjin, Shanxi and Beijing. The varieties are divided into lion head, prince's hat, official hat, lantern, chicken heart, tiger head and so on. Can do handicrafts, with a long time to play hemp walnut color such as agate, like jade, valuable. Through the carving of folk artists, the images and patterns of all kinds of animals and characters are carved on walnuts to make nuclear carvings.