Method for improving grafting coalescence rate of torreya grandis

Abstract

The invention discloses a method for improving the grafting coalescence rate of torreya grandis. The method includes the steps that cut face inversed grafting is adopted, and then high-position grafting is further matched to enable the torreya grandis to be grafted on tree stock (a main treetop is cut off at the position 50-60 cm away from the ground and two to three circles of side branches are reserved below the grafting position); a coalescence agent and the like are matched to be sprayed continuously; the nutrient and hormone level of the main treetop and the side branches of a grafted plant is changed, and the grafted branches are promoted to grow in the forward direction; the grafting coalescence rate of the torreya grandis is improved, and the torreya grandis of a high-yield tree form is formed. On the premise that the cost is not increased, the purpose that the coalescence rate of nursery stock is more than 90% is achieved, the grafted plant can grow fast, the tree form is good, the method is put into production in advance, and the yield of the torreya grandis is greatly improved.

Description

technical field [0001] This patent relates to plant cultivation technology, in particular to a method for improving the rate of grafted torreya torreya. Background technique [0002] At present, there are few public literatures on the research of Torreya torreya grafting technology, mainly in the following aspects: [0003] 1. Research on the grafting technology of Chinese torreya seed stock. A novel and practical grafting technique for quickly propagating Torreya seedlings by directly inserting Torreya scion into cotyledon suture is called Torreya seed anvil grafting. The main operation steps are as follows: collect mature seeds from high-quality trees with large seeds, thin shells, and full kernels, store them in wet sand to complete physiological post-ripening and stratify germination, select 1.5 cm long radicles as seed stock, and grow vigorously. The middle and upper part of the canopy of Youshu and the annual side branches are used as scions for indoor grafting and f...

AI Technical Summary

Problems solved by technology

At present, the grafting method is widely used in China to cultivate fine seedlings of Torreya torreya, but due to the influence of the characteristics of Torreya torreya tree species, the crown of the grafted plant is seriously partial (the main tip of the crown grows obliquely), resulting in slow growth of the mother tree, late fruiting, and low yield.

Moreover, domestic torreya seedlings are cultivated with 2-year-old seedlings as rootstocks, which are cut and grafted at a distance of 8 to 15 cm from the ground. However, due to the influence of the characteristics of the torreya tree species, the seedlings cultivated by grafting, cuttings and other asexual methods all have partial crowns. The main shoot of the crown grows obliquely, coupled with the low grafting position, the vegetative body area of ​​the rootstock is cut off, the scion nutrient hormone level is low, and the proportion of hormones between the main shoot and the side branches is not coordinated.

The existing techniques for cultivating torreya grafted seedlings cannot cultivate positive crown seedlings with positive growth of the main shoot, which leads to the problems of slow growth, late fruiting and low yield of the mother tree after the torreya is built.

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