In recent years, with the increase in the demand for large size sea otters by greening projects, the large and medium sized sea otters in green nursery gardens are obviously not enough, such as the large amount of West Lake jellyfish and colorful leaf species of the royal family such as the sea otters. The same apple tree belonging to the same family as the Haishu was used as the rootstock for grafting the jellyfish. In the orchard, after the fruit-producing period of the apple, although the fruit-producing ability is already weak, its tall tree shape and stout branches can play a role in landscaping.
Raw material selection
The life span of an apple tree is not too long. Generally, the anvil can reach 40 years and the dwarf anvil is about 20 years. When choosing an apple tree, you must purchase a middle-aged and old tree that is about 10 years old. The maximum age cannot exceed 15 years. In addition, do not choose a serious apple tree.
Different varieties of apple trees have different affinities for sea otters. The common apple tree varieties include the Red Star series and the Fuji series. These two kinds have a wide range of affinity, and it is better to use an anvil. Before grafting, it is necessary to test the affinity between apple and jellyfish. Since the affinity of each variety is different, try to use good affinity grafting. In the year before grafting, apple trees need to be rooted to promote the germination of their new roots. At the same time, cut a nutrient groove with a width of 70 cm and a depth of 30 cm around the root and apply it to a mixture of fermented organic fertilizer, ternary compound fertilizer and fertile soil.
Grafting operation
One year before using the apple to graft the jellyfish, the crown of the big tree needs to be shrunk to leave a large skeleton, which will be carried out after the annual branch is issued. Grafting is divided into two types: spring connection and summer connection. The spring connection is mainly used to connect the skin and then connect the skin. The summer connection adopts the T-shaped bud or the xylem bud. Before the spring connection, the ditch was opened under the apple canopy, and nitrogen, phosphorus and potassium fertilizers were applied to ensure its vigorous growth. After the grafting, nitrogen fertilizer such as urea could be added. In the summer when the apple tree is growing, it does not need top dressing. After grafting, water according to the dry and wet conditions of the soil. Be careful not to collect too much water. Summer grafts are numerous and large, and it is best to set up support. At the same time, observe carefully and promptly remove the buds that apple germinated.
Iris recognition technology is based on the iris in the eye for identity recognition, applied to security equipment (such as access control, etc.), as well as places with high security requirements.
Iris recognition technology is based on the iris in the eye for identity recognition, applied to security equipment (such as access control, etc.), as well as places with high security requirements.
The appearance of the human eye is made up of the sclera, iris and pupil. The sclera, the white outer part of the eye, makes up about 30 percent of the total area; The eye center is the pupil part, accounting for about 5%; The iris, located between the sclera and the pupil, contains the most textural information, accounting for 65%. In appearance, it is one of the most unique structures in the human body, consisting of many glandular pits, folds and pigmentation spots. The formation of iris is determined by genetic genes, and the expression of human genes determines the morphology, physiology, color and overall appearance of iris. By about eight months of human development, the iris has basically developed to a sufficient size and entered a relatively stable period. The appearance of the iris remains unchanged for decades, except for rare abnormalities or major physical or mental trauma that may alter its appearance. The iris, on the other hand, is externally visible, but at the same time internal, behind the cornea. To change the appearance of the iris requires very delicate surgery and risks vision damage. Iris can be used as the material basis for identity identification because of its high uniqueness, stabilit
Iris recognition technology is widely regarded as the most promising biometric authentication technology in the 21st century, and the future application of security, national defense, e-commerce and other fields will inevitably focus on iris recognition technology. This trend has gradually begun to emerge in various applications around the world, and the market application prospect is very broad.
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