1, like warm and humid climate, annual average temperature 15. 2℃ is suitable, and the highest temperature is 4 1. 7℃, relatively cold-resistant,-15℃ from freezing damage. However, low temperature at flowering stage will affect flowering, pollination and flower development.

2. Carya illinoensis needs more water, and the water demand is different in different periods of the year. Generally, an appropriate amount of rain is needed in the spring shoot growth period before flowering, continuous rain is avoided in the flowering period from late April to mid-May, and the development period of fruits and naked buds is from June to September, which requires sufficient and even rainfall.

The requirements for light are not high.

3. Young people need a cool environment. Therefore, Carya cathayensis seedlings in Lin 'an need artificial shading. Adult trees do not grow well on sunny and dry slopes. Weathered gravelly loam should use loose calcareous schist rich in humus, and it is best to use oil black soil, yellow soil developed on limestone and yellow soil developed on sandstone, slate and shale.

Second, reproduction:

At present, sowing is the main method, and rootstock seedlings can also be used for propagation.

Sowed seeds need nuts to be fully ripe. After the seeds are harvested, they are selected by water and sown in autumn. When sowing, the seeds must be placed horizontally. If you don't sow in autumn, you must store it in wet sand. Seedlings usually need to be cultivated for 2 years before they can be planted in nurseries. It can also be propagated by grafting in spring.

Third, planting:

We should choose plots with deep soil layer, loose soil, sufficient water and sunny lee for planting.

The suitable plant spacing is 4m× 5m ~ 7m× 8m. The required planting hole diameter is 1 ~ 1. 5m, depth 1 ~ 1. 2m； The topsoil and the core soil are separated. First, lay a layer of straw at the bottom of the pit and cover the topsoil by 20 cm. Add 50 kg of organic fertilizer, 20 g of methyl bromide powder and 500 g of calcium superphosphate, and mix well with soil. 2- 10 month seedling, 65438+. After planting, fix the tree tray and water the feet.

It can also be broadcast live to create a fruit forest. The sowing time is from June 10 in winter to March of the following year, except for freezing weather. When transplanting, it is best to bring soil balls at close range, and when transporting for a long distance, the roots of seedlings will be immediately stained with mud after digging out, which can play a protective role.

Fourth, plastic trimming:

1, early pruning should be light, leaving more main branches to make it bear fruit early. When pruning, make the canopy room ventilated and transparent. In the early stage, try to keep the upper branches of the crown, the lower part of the crown can be gradually thinned, and dense branches can be sawed off if necessary.

The incision must be leveled and coated with protective agent to prevent decay.

2. After the Carya cathayensis tree in Lin 'an enters the aging period, all the parts above the regenerated branches in the crown can be sawed off to cultivate the sprouted regenerated branches, and all the dead parts of the main branches in the aging crown can be cut off. At the same time of pruning and renewal, it is best to combine deep ploughing and fertilization.