Diverse Hazelnut Tree Varieties: Scientific Methods for Planting and Management

The hazelnut tree is a deciduous shrub or small tree of the genus Corylus in the birch family Betulaceae. It occurs naturally in the mountainous areas of Northeast, North, Northwest and Southwest China, and is one of the world's well-known nut tree species. Its fruit is what we commonly call the hazelnut; the kernel is rich in oils and protein and can be eaten directly, or used for oil pressing and pastry processing, giving it relatively high economic value.

Common types include the wild Siberian hazel (Corylus heterophylla), the introduced European hazel (Corylus avellana), and the Ping'ou hybrid hazel bred by crossing the two. The Siberian hazel is highly cold-resistant but has smaller fruit, the European hazel has large fruit and prefers warmth, while the Ping'ou hybrid hazel combines cold resistance with large fruit, making it suitable for cultivation in most production areas of China. The hazelnut tree is light-loving with a well-developed root system, and its soil requirements are not particularly strict, but it grows best on plots with deep, loose, fertile soil and good drainage.

When planting hazelnut trees, choose a sunny, wind-sheltered plot with good drainage. Propagation methods include sowing, division, layering and grafting, though in production, well-grown nursery stock is mostly used for direct planting. Because most varieties have a low fruit set rate under self-pollination, it is advisable to plant pollinator trees when establishing an orchard. After planting, good water and fertilizer management and shaping and pruning are needed; during the young tree stage, focus on developing a good tree form, while mature trees should have overly dense branches and diseased or pest-damaged branches removed in time.

Hazelnut trees generally enter the fruiting stage several years after planting, and the specific number of years is closely related to the variety, the type of nursery stock and the level of management. In routine management, pay attention to controlling leaf-eating and fruit-boring pests; in cold northern regions, winter protection measures should also be taken for young trees in winter to ensure a robust tree and a stable harvest.