Torreya grandis is an excellent variety of Torreya grandis and a rare dried fruit tree with high cultivation value and good ecological landscape benefits. Torreya grandis, as a dried fruit, has been listed as a characteristic and advantageous industrial belt in Hangzhou. When more than 2+3 grafted seedlings are used for afforestation in Torreya grandis base, they can generally blossom and bear fruit in the third year. In the sixth year, dry seeds can produce 1 ~ 2kg, and adult trees can produce about 10kg. The yield per mu can reach more than 10 thousand yuan, and the economic benefit is very considerable. Developing Torreya grandis industry is one of the important ways for farmers in mountainous areas to get rid of poverty and become rich and well-off.

I. Selection of afforestation sites

The ideal afforestation site of torreya grandis requires low mountains and hills, cool, high air humidity, not too strong sunlight and good drainage. Slightly acidic to neutral sandy loam, purple soil, calcareous soil and other soils are suitable for planting torreya grandis, and the soil with pH less than 5 is not suitable for developing torreya grandis, and the soil with deep fertility, good permeability and low groundwater level is the most suitable. Torreya grandis needs plenty of sunshine after fruiting, so afforestation above 400 meters above sea level should be chosen on sunny slopes.

Second, forest land consolidation.

According to the characteristics of young torreya grandis trees needing shade and the need of soil and water conservation, forest vegetation is reserved, which is beneficial to the survival and growth of afforestation. Generally, the sloping land below 15℃ can be fully cultivated, and interplanting of forest and grain is advocated; Strip soil preparation at 15 ~ 30℃ slope, retaining terrace vegetation and intercropping forest and grain; Slopes above 30℃ shall be prepared in the form of fish scale pits, and large holes (with a diameter of 80 cm and a depth of more than 50 cm) shall be dug, and vegetation around the holes shall be preserved.

Third, planting technology.

1. Apply sufficient base fertilizer: apply 10 ~ 20kg fully decomposed organic fertilizer to each hole in the planting hole, and fill it with weeds, fallen leaves, turf, etc. If conditions permit, proceed in layers. Tread a little, the height is not more than half of the hole depth, backfill the topsoil around the planting hole, which is about 10 cm higher than the ground, or backfill it twice. Before planting, apply 0.5 kg of calcium magnesium phosphate fertilizer to each hole and mix well with the hole soil.

2. Planting density: Torreya grandis has a very long economic life, and a century-old tree can cover hundreds of square meters. Meanwhile, torreya grandis grows very slowly. Considering the early economic benefits, the initial planting density is generally 4×4 or 4×5 meters, and it is appropriate to have about 35-42 plants per mu.

3. seedling size: It is required to provide excellent clones of authentic torreya grandis, and the clones shall be determined as afforestation materials. Seedling size requires that grafted seedlings above "2+3" must bring soil balls or container seedlings. The specific requirements of improved varieties and strong seedlings are: strong growth, developed root system and many main lateral roots; The height of seedlings is more than 50 cm; The ground diameter is greater than1.5cm; Grafted seedlings require more than 3 branches.

4. Planting time: early spring (late February to early March) is suitable; Afforestation can also be done in late autumn and early winter (165438+ 10 to February of the following year), but it should be noted that the temperature should be above 0℃ and the water supply should be sufficient.

5. Planting method: Torreya grandis seedlings should be planted shallowly, and the soil surface should be 2 ~ 3 cm higher than the root diameter. It is forbidden to bury the grafted part in the soil. When planting, attention should be paid to the seedling, the root system should be stretched, the seedling should be pulled out and compacted after half filling, then compacted and finally covered with virtual soil. After planting, use sunshade net to shade the sun in time.

6. Pollination tree configuration: Torreya grandis is a dioecious plant, and 3% ~ 5% of Torreya grandis grafted seedlings must be configured as pollination trees when planted in areas without male plants around. Torreya grandis is pollinated by the wind, so it should be planted in the high altitude of the female torreya grandis.

Fourth, interplanting under forest

Torreya grandis grows slowly and needs shade when it is young. Therefore, the three-dimensional management mode of interplanting Torreya grandis under the forest can be adopted, and suitable deciduous trees and other economic forests that need to be transformed should be selected for interplanting Torreya grandis. The canopy density should not be too high and the light transmittance should be above 40%.