Jujube autumn application base fertilizer is good
The base fertilizer has a good effect on the spring germination, shooting and fruit setting of jujube trees. Ma Zhifeng, a professor and fruit expert of Yangling Vocational and Technical College, pointed out that the base fertilizer of jujube is generally used after the harvest of jujube fruit until the spring of the next year. Time, the best effect with autumn. Because the temperature in autumn is high, the fertilizer is easy to decompose, which is beneficial to the absorption of jujube trees, and is also conducive to the healing of root wounds caused by fertilization. In addition, it can also enhance the cold resistance of the tree, which is conducive to the safe wintering of the jujube. Ma Zhifeng said that the following points must be mastered when fertilizing:
The choice of fertilizers is generally based on organic fertilizers, such as manure, soil, fertilizer, plant ash, etc., with appropriate nitrogen fertilizer and phosphorus, potassium fertilizer, in order to facilitate the tree. The application rate of organic fertilizer should account for more than 90% of the amount of fertilizer applied, and must be applied after being decomposed.
The amount of fertilizer applied should be determined according to the size of the jujube, the nutritional status, and the number of fruits. The general application amount is 35 kg to 50 kg of organic fertilizer, 1 kg to 1.5 kg of superphosphate, and 0.4 kg to 0.5 kg of urea.
The fertilization method should use different methods depending on the age of the tree, the planting density, the type of soil, and the amount of fertilizer.
Ring groove application. An annular groove is dug around the periphery of the canopy. The depth and width of the groove are 30 to 50 cm each. Mix the fertilizer with 3 times the soil, fill it into the ditch and fill it with the subsoil. The fertilization method is suitable for jujube saplings, and the fertilization ditch moves outwards year by year to induce the root system to expand outward.
Radial groove. Applying 4 to 6 entrance-shaped ditches 30 to 50 cm away from the trunk of the jujube tree, the ditch grows to about 0.5 m outside the canopy, and the depth and width of the ditch are 30-50 cm each, and the ditch near the trunk is shallower. The far trunk is deeper into the ditch. The topsoil and the base fertilizer are mixed and applied, and then the ditch is used to fill the ditch. This method of fertilization has less root damage and a larger contact area between the root and the fertilizer, and is suitable for mature trees.
Strip groove application. That is, the jujube tree line digs a through-ditch along the outer side of the canopy, and a short ditch can be dug outside the canopy of the jujube tree. The depth and width of the ditch are 30 to 50 cm each. The strip groove is to be rotated on both sides of the crown. This method saves labor and fertilizer, and is very suitable for flat date gardens. Mountain hills and jujube gardens can also be used.
The whole garden and the tree are spread. Spread the base fertilizer evenly under the jujube or crown, then turn it 20 to 30 cm deep and turn the fertilizer into the soil.
The above several fertilization methods can be used alternately. When digging the fertilization ditch, pay attention to the less damage to the root system, especially the roots with a diameter greater than 0.5 cm should be carefully protected to avoid cutting. According to the test, deep application is better than shallow application without cutting the roots of jujube trees.
After the watering and moisturizing fertilizer is applied, the water should be irrigated 1 or 2 times. In this way, sufficient water can be ensured, which can not only rapidly decompose and ferment the fertilizer, but also prevent the jujube from being arid in the autumn of autumn. After watering, cover the mulch with crop straw, thatch and other things.
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Orthopedic external fixation system
The screw orthopedic is inserted into the bone near the fracture, and the fracture is fixed with an external fixator assembled by a chuck and a nail rod.
Indications
open fracture, nonunion, closed fracture with extensive soft tissue injury, fracture with multiple trauma, osteotomy and correction.
The use of orthopaedic external fixators is currently a superior fracture fixation technique, filling the gap between cast and internal fixation. At the same time, orthopedic external fixator has the characteristics of simple fixation method, stable, reliable and effective, and does not limit the joint movement, can be early ambulation advantages. It can reduce the time for the operator and is more friendly to the user. The external fixator was used together with the bone traction needle. In terms of the classification of orthopedic external fixators, it is mainly divided into four types: orthofix type external fixation, ilizarov type external fixation, ao synthes type external fixation,combined external fixator and common external fixators.
The external fixators in orthopaedics was used for reduction (shortening and overlapping displacement were corrected first, then lateral and angular displacement were corrected, and finally rotational and separation displacement were corrected; If closed reduction is difficult, open reduction can be considered, but the separation of soft tissue and peeling of periosteum should be minimized.
The selection of the insertion site.According to the anatomical characteristics of the soft tissue at the insertion plane, the important nerves, vessels and tendons should be avoided; The ideal entry point is the part of the bone close to the subcutaneous, in a word, generally choose the skin and bone between the muscle soft tissue is the weakest point into the needle. The installation shall facilitate observation and control of soft tissue damage, and permit any surgery that may be required, such as repair and reconstruction, dressing change, skin grafting, or bone grafting." According to the location of the bone, different diameters of the threaded needle were selected. Removal was performed after completion of late treatment.
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