When will thin-shell pecans be planted in the United States? How many years do you want to bear fruit?

American thin-shell pecan is native to the Mississippi River Basin in the United States. It was introduced to China in the early 20th century. It belongs to the family Carya, Carya and Carya species. With Chinese hickory fruit small, thick core and shell, nuclear red has astringent taste, must be boiled and deastringent before use and consumption. In comparison, the American thin-shell pecan fruit is long oval or oval, large nuts, extremely thin core shell, smooth surface, hypertrophic nucleolus, rich oil and aroma, oil content is generally more than 70%, sweet taste, excellent quality, raw food, fried food or pastry, delicious and delicious, is a world-famous nut. American thin-shelled pecan is also a high-quality wood variety. This paper introduces the methods of fruit cultivation.

When will thin-shell pecans be planted in the United States? How many years do you want to bear fruit?

The garden should be planted in areas with an annual average temperature of more than 916 ℃ and annual rainfall of more than 800mm. Because it is a deep-rooted fruit tree and its drought resistance is weak, it is more suitable to choose the soil with deep and fertile soil and strong water retention capacity. Walnut is a light-loving fruit tree, which requires sufficient light, so it is better to choose the south slope when building a garden in the mountains.

Grafted seedlings can hang fruit 4-5 years after planting, and enter the high-yield period in 8-10 years, while the seedlings need 8-10 years to hang fruit, and about 15 years to enter the high-yield period. Therefore, grafted seedlings must be used to use American thin-shell pecans. Generally, the planting from September to November is the best. Under the premise of controlling crown and shoot to dwarf the tree, the row spacing can be 5 m × 4 m or 5 m × 5 m. Carya mandshurica is a monoecious fruit tree, and female flowers and male flowers are generally not in full bloom on the same plant, so pollination is required between different plants. Therefore, only a piece of walnut orchard can achieve high yield. Dig the hole according to the standard of 1.5 meters in diameter and depth, and then apply basic fertilizer (40 kg of organic fertilizer, 500 g of calcium superphosphate, 20 g of methamphetamine powder) to mix well with the soil, and then plant. After planting, pour enough water to fix the root, and cover the tree plate with weeds to facilitate survival.

Plastic pruning is carried out during the dormant period from winter to early spring. In the year of planting, it did not make any pruning, but only straightened the trunk and protected the top bud. After sprouting in spring, the terminal bud grows upright upward and takes it as the central stem. Pruning and shaping began about 2 years after planting, and the top tips were removed when the height of the seedlings was about 2 meters. Four side branches with uniform distribution and vigorous growth were selected as the first layer main branches, and then the second layer main branches and the third layer main branches were selected. The second layer retained 2 main branches, the distance between the second layer main branches and the first layer main branches was 6080 cm, and the distance between the third layer main branches and the first layer was 500.70 cm. In view of the fact that American thin-shelled Carya cathayensis is dominated by strong branches, lateral strong branches must be used as backbone branches, and the inner chamber of the crown should be ventilated and transparent.

To strengthen the management of young trees, it is necessary to apply thin fertilizer frequently, top dressing from planting year to germination, once a month, to the end of September, and 4 times in March, June, August and October every year in the second to fourth year. Adult trees apply base fertilizer from September to October, applying fully mature organic fertilizer 5000 kg, phosphate fertilizer 50 kg, plant ash 100kg and urea 15 kg per mu. Topdressing was done before germination in the following year and from June to July, respectively. And pay attention to the control of powdery mildew, brown spot, black spot, scab, aphids, gibberella and diamondback moth.