What kind of tree can be grafted onto a walnut tree? When is the right time for grafting? How is it grafted?

Walnut tree, also known as walnut tree, also known as spade, belongs to the walnut family. The variety is divided into wild walnut and artificial grafting improved variety walnut. What kind of tree can be grafted onto a walnut tree? When is the right time for grafting? How is it grafted?

What kind of tree can be grafted onto a walnut tree?

Generally speaking, the effect of mutual grafting is good only for plants of the same family and genus. The best thing about grafted walnut trees is:

1. Seedling grafting of walnut (seedlings sown from walnut seeds).

2. Juglans mandshurica in walnut family can be grafted, such as Juglans mandshurica (Juglans mandshurica), but it is easy to show small feet (thin rootstock, thick above the grafting interface).

3. Maple poplar of walnut family (south), which can also be grafted walnut.

When is it appropriate for walnut trees to be grafted?

The main results are as follows: 1. The suitable time for branch grafting is from early April to early May. Because this technique is not easy to master and the survival rate is not high, the application of this method is not recommended.

2. The best time for bud grafting is from mid-May to late June, when the temperature and humidity are suitable, the rootstock and ear grow vigorously, the callus is easy to form after bud germination, and the degree of Lignification is high, which is conducive to safe winter.

How are walnut trees grafted?

1. The rootstock is treated to remove the dense and redundant branches and straighten out the tree. Select the branches with a thickness of more than 1 cm, select the grafting site within 10 cm from the main branch (make the tree shape compact), then leave 4-5 leaves above the branch to remove the top, flexibly grasp the direction of the bud, the direction of the central dry bud is inward, and the rest of the lateral branch buds face one side or the back of the branch, which is conducive to the restoration of tree shape.

2. Select the buds on the mature and full scion which are similar in thickness to the rootstock as grafting buds, cut back to the original direction of the knife when the upper part of the bud is about 1 cm away from the bud body, and then push the bud body to the other side at the break of the tear. separate the xylem and phloem of the bud piece, make sure that the growing point is all removed, and finally tear off the bud piece by hand.

3. Grafting on the rootstock that needs to be grafted, choose a position, direction, smooth part, and cut a knife according to the size of the bud. Cut vertically (the length should be more than 2 times the length of the bud, which is beneficial to water drainage), then cut across the knife, tear off the phloem, and the part removed is about 0.2 cm in length and width respectively. Then put the selected buds into the rootstock and make sure that the horizontal and vertical edges of the buds are aligned with both sides of the rootstock. Finally, the buds are tied up from bottom to top with elastic plastic strips to ensure that the buds are in close contact with the cambium of the rootstock and there is no place to run.

Management after grafting

1. De-sprouting, cutting rootstock and unbinding: one week after grafting, the buds of rootstocks begin to germinate, all these sprouts should be removed, the leaves left during cutting rootstocks should be retained for photosynthesis, and the buds should be protected from direct sunlight until the buds do not germinate. When the grafted buds grow to 5 cm or when the grafted buds heal, cut the anvil and leave 3 cm above the grafted buds. Unbind the buds when the buds grow to 15-20 cm (when the buds heal).

2. Fertilizer and water management: strengthen fertilizer and water management according to soil moisture after grafting. When the lack of soil moisture is not serious, do not water and fertilize 2 weeks after grafting, but should be watered in case of severe drought. When the new tip grows to more than 10 cm, it should be topdressing and watering in time, generally topdressing urea 50 jin per mu, watering once after topdressing. Ploughing and weeding in time after watering to prevent excessive evaporation of water and weeds. After July, 300 × 500 times of potassium dihydrogen phosphate was sprayed every half month to enrich the branches, prevent the seedlings from growing and improve the overwintering ability.