Walnut outdoor branch connection

Tests have proved that the research on the outdoor branching technology of walnut has achieved satisfactory results and the survival rate is over 85%. It has been proved through promotion that this is a new method of grafted seedlings with high survival rate, low cost and good seedling quality.

Walnut outdoor branching technology can be divided into wax-sprout scion grafting method and wet soil bagging method according to the different methods of scion and interface moisturizing method. The wax-sealed scion grafting method uses a wax seal scion and a plastic strip dressing interface to prevent grafting and dehydration of the graft. This method has higher requirements on the quality of scion, and the survival rate is unstable in the dry and windy northern regions in spring. Wet soil bagging rule is to use a newspaper around the interface rolled into a tube, into the wet soil, and then put on a plastic bag to moisturize, so that the grafted healing body in a relatively stable moist environment for a long time, to avoid the spring drought and windy The effect of the grafting method is to obtain a stable grafting survival rate, and the quality requirement for the scion is not high, and it is more suitable for promotion and application in northern regions. After many years of experimental research and improvement and improvement around this method, we have systematically grasped the collection, storage, and grafting techniques of walnut scion. The technical points are as follows:

1. Collected cuttings were collected at the end of November and collected with the same volume of disinfected sawdust at a humidity of 60% to 65%. The plastic cloth was packaged and moistened, and stored at a constant temperature of -3°C. Within the reserve, it can be stored until April of the following year. In the later period, attention should be paid to checking the condition of the ear bud and adjusting the temperature appropriately. In addition, scion requirements are full, free of pests, and pure varieties.

2, stock selection. Select 1-3 years old ordinary walnut seedlings, and grow well, no pests and diseases, 10 cm above the base diameter 1.5-3 cm, 15-20 days before grafting should be in the base of the rootstock above the level of 20 cm cut anvil discharge injury.

3, grafting period. It is better to graft from the rootstock to the leaf stage. Wet soil bagging method uses enclosure insulation or cooling materials (such as black plastic bags and reflective film bags, etc.) can extend the effective grafting period of about 2 months; grafting method can be used due to different conditions, double tongue joint method, indirect skin graft, Plug skin tongue and quarter skin graft; grafted healing body treatment using wet soil bagging method.

4, then manage. Should pay attention to check the soil moisture content in the bag, timely replacement of wet soil, irregularly remove the rootstock bud, and after grafting for 20 days, pay attention to the new air release, and remove the soil bag, vertical support, in addition to binding and so on.

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