How to ensure the survival rate of grafted seedlings?

How to ensure the survival rate of grafted seedlings?

Platycladus orientalis is born in cold-resistant, drought-resistant and saline-alkali-resistant calcareous soil with good wet and fertile drainage, and can grow on flat ground or cliffs; in dry, poor mountain areas, the growth is slow and the plant is weak. Shallow roots, but developed lateral roots, strong sprouting, pruning resistance, long life, resistance to smoke and dust, resistance to sulfur dioxide, hydrogen chloride and other harmful gases, widely distributed, is one of the most widely used ornamental trees in China. Like light, slightly shade-tolerant when young, strong adaptability, lax requirements on the soil, can grow in acidic, neutral, calcareous and light saline-alkali soil. It is resistant to drought and barren, strong sprouting ability and medium cold resistance, which is only distributed below 900 meters above sea level in Shandong Province. those below 400 meters above sea level grow well and have weak wind resistance.

Sabina vulgaris can be propagated by sowing, cutting, grafting and other methods. In the existing technology, cutting is generally used to breed Sabina vulgaris, but this method is not only troublesome, but also encountered diseases and insect pests in the process of planting. In this way, the yield and survival rate of Sabina vulgaris are reduced, and the ornamental value is reduced.

1. Pretreatment of rootstock: Platycladus orientalis, which is in good growth condition and free of disease and insect, was selected as rootstock. 15 days before grafting, the rootstock was treated with basic fertilizer, and the top tip of the rootstock was cut off one day before grafting, and the cut part was wrapped in plastic immediately.

2. Pre-treatment of scion: Sabina vulgaris with good growth condition and no disease and insect was selected, and the branch with diameter of 5cm was selected as scion at the top, and the top dominance of scion branch was cut off. When the sprouting bud of truncated branch grew to 5cm, it could be used as scion backup [Jishan Huayao].

3. Grafting: the grafting part of Platycladus orientalis rootstock is cut downwards to the incision of xylem, and the growth of the scion is cut into two slopes on the other side of the bud, the long slope facing inward, which is aligned with the cambium of the stock. Each layer is grafted on the left and right side of the scion, and the height difference between the front and back and the left and right scions is 9cm. After grafting, plastic film is used to wrap and seal the rootstock and the scion. Avoid moisture loss of scion.

4. Late stage management of grafted seedlings: fertilizer and water management and pest control were carried out regularly.

Among them, the base fertilizer is composed of the following raw materials: 5 parts of potassium polyacrylate, 15 parts of poultry manure, 20 parts of pond mud, 10 parts of peanut cake, 3 parts of lysine, 3 parts of methionine, 3 parts of borax and 3 parts of lime powder.

The grafting method is one or two of single-layer ball grafting and double-layer ball grafting, and the scion is soaked in 5min with plant auxin before grafting to the rootstock.

Fertilizer and water management is as follows: after grafting for 5 days, water thoroughly once, and then once every half a month, farm manure is applied once a month; pest control is: spraying with 50% carbendazim 800 times solution every month.