Can Torreya grandis be planted in Jingzhou, Hubei?

Torreya grandis can be planted in Jingzhou, Hubei Province, with sufficient light energy, sufficient heat and long frost-free period, which is beneficial to the growth of Torreya grandis.

Analysis and explanation:

During the normal growth and development period, the average annual temperature of Torreya grandis is 14~ 18℃, the average accumulated temperature over the years is over 7000℃, the annual extreme minimum temperature is ≥- 15℃, the maximum temperature is ≤43.0℃, and the number of frost-free days is ≥ 26544.

Torreya grandis is a relatively cold-resistant tree species in subtropical zone, which is dioecious, shallow-rooted and semi-negative evergreen. In a warm and humid climate with cool light, it is the best habitat on both sides of the fog stream and mountainside valleys with less direct light and more scattered light, and is suitable for planting in the south of the middle and lower reaches of the Yangtze River.

Torreya grandis has low requirements on soil and strong adaptability, and likes slightly acidic to neutral loam, that is, P.

H value is 4.5-8.5, it is drought-resistant and barren, and red soil, sand (stone, gravel) lime soil can adapt to it, and it can also take root and grow in exposed rock cracks.

Jingzhou belongs to subtropical monsoon climate zone. Sufficient light energy, sufficient heat and long frost-free period.

The city's annual total solar radiation 104- 1 10 kcal/cm2, annual sunshine hours 1800-2000 hours, annual average temperature 15.9- 16.6℃, and annual average temperature.

Therefore, this area is suitable for planting torreya grandis, not in the tuyere.

Training points:

Torreya grandis seedling is divided into two stages: seedling raising; Grafted seedlings cultivate grafted seedlings.

According to the biological and ecological characteristics of torreya grandis, hills or low mountains with a slope of 5- 15 below 700 meters above sea level, loose and fertile soil (over 80 cm in soil layer and over 20 cm in humus), good drainage, gravel content less than 20.0%, sufficient water and convenient transportation are selected as afforestation sites.

Choose 2+2a grafted seedlings, the height of which is more than 50cm, the roots are developed, the trunk is stout, the leaves are thick and shiny, the scion buds are upward, and there are no pests and diseases. The initial planting density of afforestation is 33 plants /667 square meters, and the plant spacing is 4m×5m.

Torreya grandis is a dioecious plant. When grafting seedlings are planted, a certain proportion of grafting seedlings of torreya grandis must be allocated as pollination trees, and the allocation ratio of female torreya grandis to male torreya grandis is 8: 1.

In order to prevent freezing injury, planting seedlings should be adopted for afforestation in winter or early spring, and Mao Mao should choose windless cloudy days or rainy days.

Torreya grandis seedlings should be planted shallowly, and the soil surface should be 2~3cm higher than the root diameter. It is forbidden to bury the grafted part in the soil. Pay attention to the stretching of vertical seedlings and roots when planting. After filling half of the soil, the seedlings should be pulled out and compacted, then filled and compacted, and finally covered with virtual soil.

It is best to strengthen the plants properly, such as inserting small bamboo poles to support and bind them to prevent the joints from cracking. Appropriate male plants can be arranged in the forest or windward for pollination after maturity.

Water and fertilizer management:

Comprehensive tending is carried out once a year from July to August, and the tending method is still the combination of point caressing and mowing, and the cut weeds are covered on the roots to reduce water evaporation in summer.

Where conditions permit, a drip irrigation system can be built, and at the same time, the required fertilizer can be applied to the roots of torreya grandis through the drip irrigation system.

Organic fertilizer can be applied once every spring from May 438 to February, and farmyard manure is the best, and the fertilizer is buried in the roots.

Plastic decoration:

Pruning is an important measure to improve the yield of torreya grandis. In order to achieve high and stable yield of torreya grandis, it is necessary to control tree height and crown width.

If the tree is too high, it needs more nutrients, which is not conducive to the picking of torreya grandis. However, if the tree shape is too low, it may not give full play to the yield advantage, and it can be pruned appropriately after afforestation for 2 years.

The crown height should be controlled at 4-5m, and the crown width should be kept dry and round. After the crown is shaped, it should be trimmed regularly every year. At this time, it is only necessary to cut off dense branches and diseased dead branches.

note:

Source: Hubei Provincial Department of Agriculture.

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