First, change the dry

1. Objects suitable for dry change:

(1) The trunk is low and curved. (2) Damage (including natural and mechanical damage). (3) Windbreak. (4) The upper branches died due to insect or frost damage. (5) Sharpness.

In the first and second year old saplings and nurseries where the above phenomenon exists, the seedlings that were not cultivated in the same year are exchanged for dryness.

2. Method: Before spring sap has not started to flow, cut off the trunk from the root (preferably flat or slightly below the ground) using a knife or saw. The profile should be smooth and smooth to prevent chapped cracks, which will help wound healing. After cutting off, soil is sealed 20 cm to prevent freeze-drying. When the buds germinate, they will be dumped on the soil. When the germination buds grow to 15-20 cm, an upright and vigorous bud that is close to the rhizome is selected to be cultivated into a new stem, and the rest of the germination buds are all removed from the base. If the management is meticulous, then the Shinkansen can grow to a height of 6 to 7 meters, and it can be cultivated into a tall, straight, unstructured high-stem tree.

Second, wipe buds dry

This method mainly uses the germination of the axillary buds on the upper end of the seedlings to form a new stem. The selected axillary buds become fuller, the stronger the germination force and the branching force, the smaller the branch angle, the more the new ones will be more prosperous, and the dryness effect will also be achieved. The better, the use of buds to dry the time, in the case of better site conditions, timely management of water and fertilizer, seedlings stout, should be carried out in the spring of the year of planting.

1, suitable for buds to dry the object:

(1) The seedlings are thick, and the roots are well developed, but the trunks are low, the site conditions are good, and the soil is fertile.

(2) For stout seedlings in the nursery, the buds can also be used to dry them.

method:

When the buds sprout 2 to 3 centimeters when the sap flows or flows in the spring, from the top of the seedling stem to the third or fourth tree bud, select an upright and strong bud that matches the direction of the wind. Dry the sprouts, while cutting the other weaker ones together with the upper ones from the germination point with scissors. Do not injure the septal septum and cut the septum so that the wound heals. The dried buds that are left as selected can grow upward due to the apical dominance and form a straight dry new stem. In the lower part of the grafted shoots, 2 to 3 axillary buds are reserved, and the auxiliary branches are formed by germination, and the rest of the buds are to be erased. When the auxiliary branches grow to 20 to 30 cm, topping is performed to suppress the extension of the shoots and reduce nutrient consumption. , so that the concentration of nutrients supply the growth of new dry. Special attention must be paid here to the supplementing of branches, not just once but two, three or more times.

The method is simple, easy to operate, can fully utilize the cultivation of low and strong seedlings for planting, and can be cultivated into a high-dry tree after the planting.

There is no scar in the dry area. Due to the enrichment of seedling stem tissue, the occurrence of sunburn and cracking is reduced.

Three, flat head dry

This method uses the sprouting of axillary buds or adventitious buds on the trunk to grow into a new stem. The strengths and weaknesses of the new connection will depend to a large extent on the strength of the budding force and the size of the corners. If the strength is strong and the angle is small, an ideal new trunk can be formed.

1, suitable for flat headed dry objects:

(1) The trunk of the second and third year is low.

(2) Poplar saplings with erect erect and curved upper part.

2. Method: Before sap flow in early spring.

(1) For low and dry seedlings but straight trunks, the entire tree head (canopy) can be removed at the branches on one side of the trunk.

(2) The upper trunk and head of the trunk can be removed from the upper part of the main trunk and the lower part of the main trunk. However, the cut-off must be selected to stay in the same direction as the main stem, which is in the same direction, and not more than 2 centimeters from the upper edge of the leaf base, so that the interface can heal well.

3, requirements: the section should be smooth, slightly tilted, the buds left after the election to germinate, we must promptly erase the remaining buds in order to ensure that the dry buds have sufficient supply of nutrients, promote robust growth. If the buds move downwards, they should be sawed off when the buds grow to 20 cm.

The trunk section can be fully utilized to increase the trunk height (when the thick diameter of the stem is 8 to 10 cm, it can be healed in the same year), and the new grafted buds are easier to protect than the germinating buds. The trunk can be protected from sunburn and freezing cracks.

Fourth, "destination" connection

The so-called "destination injury" is the use of adventitious buds on the top of the trunk after a purposeful injury, retention, and stimulation, sprouting a new bud that grows upward and forming an upright new joint.

“Diaphragm” was performed promptly in the second or third year after the poplar seedlings were planted. The time of the dry grafting was late, the collaterals were thickened quickly, and the collateral wounds were repaired after the joints were dry and could not be healed as soon as possible, thus affecting the growth.

1, the object: the trunk upright, grow well, but can not reach the ideal height, you can use dry eyes.

2. Method: Before the sap flows in the early spring, shoots are taken at the branches of the trunk at the top of the branches, and the buds are selected perpendicular to the trunk to carry out “eye injury”. If the apical collaterals are weakly produced, the grafting site may optionally grow on robust lateral branches, and the upper stems are cut off, followed by an "eye injury". This method is called "flat head, eye injury combined method." Eye wounds are 2 to 3 cm above the buds, with a knife that cuts two knives and reaches deep into the xylem. The length of the incision must account for two-thirds or one-half of the lateral branches (that is, semicircular or three-fold. Second ring skinning), the blade width must be more than 5 cm, can not be less than 5 cm; if narrow, then healed in order to avoid a second operation. After the wound was cut, the skin was peeled off to make it cut off nutrients, and to stimulate the sprouting of "vegetative" buds to form new stems. At the same time, the branches above the "eye wound" mouth should be cut short to eliminate the erect leggy branches. In addition, the upright branches or new buddies that grow in the canopy must be promptly removed to control the nutrient consumption and to make room for appropriate space. A disk is formed to promote the rapid growth of visually impaired shoots. We can cultivate a tall tree on the basis of the original. Can connect older (3 to 4 years old) trees.

Poplar should pay attention to the following issues:

1. While artificially connecting dry, it is necessary to strengthen fertilizer and water management.

2, pay attention to time, in the age of the tree, Ning rather not late.

3. When the stems are changed dry, the side branches that are issued do not matter, promoting root growth.

4. The buds left behind by the buds must be picked up in time.

5, the flat head to do dry must be promptly wipe buds (here, wipe the bud is not just once, but two or three times), in addition, if the buds move down, the residual pile must be promptly removed.

In addition to carry out the poplar connection, but also to master the three words, namely: steady, accurate, and ambiguous. The so-called stability of safety first, can not be mistaken, repeated observation of the tree several times. The so-called criterion is based on the observation of the phenomenon, the material, determine the method of connection, from where the next knife, how to knife, go to several branches, leaving a few branches, we must be sure. The so-called embarrassment is what means should be taken, do not pity. Eye injury must be wide.

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