The number of tung trees planted per acre of land is not fixed, but needs to be determined based on the management method, variety, and afforestation conditions. Here are some common planting density references:
1. Grain based intercropping of tung trees and grain crops: Under this management mode, tung trees are intercropped with grain crops, usually planting about 15 tung trees per acre of land. This planting method can fully utilize land resources while ensuring the yield of food crops.
2. Inter cropping of tung trees with tung trees as the main crop: If tung trees are the main business object and also used as grain crops, the planting density of tung trees per mu of land will be appropriately increased, usually between 20-25 plants.
3. Pure forest planting: For pure forests specifically planted with tung oil trees, the planting density will be higher. According to different varieties of tung oil trees, the number of trees planted per acre will also vary. For example, the varieties of millet paulownia and weeping paulownia can grow 60-75 plants per mu, while the varieties of rice paulownia can grow 50-60 plants per mu.
Another common way to set planting density is to determine it based on row spacing and plant spacing. Generally speaking, the row spacing can be set to 3-4 meters and the plant spacing can be set to 2-3 meters, so that approximately 100-150 tung trees can be planted per acre of land.
The number of tung trees planted on one acre of land is influenced by various factors, including management methods, varieties, and afforestation conditions. Scientific and reasonable planning and design should be carried out according to the actual situation before planting.