Cuttings as a kind of economical and simple seedling propagation method have been widely used in production, but some seedlings have relatively high mortality in the early stage of cutting. Based on years of experience in production practice, the author summarizes the following analysis: First, the cause of death About a month after deciduous seedling cutting, the seedling height can reach about 10 cm. At this point seedling growth by consumption of cuttings of their own nutrients, so called the seedlings during this period as "false holiday", usually in about 20 days, this time is the peak of death. 70% of the deaths due to species quality problems, other factors accounted for 30%, the specific reasons are the following aspects: 1. Species collection is a kind of strip collection time is too early. Seedlings are not harvested when they are not yet ligneous. Whether or not branches are enriched directly affects the amount of nutrients in the body, and nutrients accumulated in the cuttings are the main source of new organs and nutrients needed for initial growth after cutting. The second is collecting shoots from an over-aged mother tree. The metabolism is weak, the vitality and adaptability are reduced, and the survival rate of cuttings is low. The third is that the specifications of the strips do not meet the standards, and only the strip length is ignored and the thickness is ignored. The thicker the branches of the same age, the better, but also have a certain length. Due to the limited conditions, the collected branches cannot be transported back to the cutting sites in time to cause the species to be stale. 2. The strips collected by the stripe treatment are not timely, and the collected strips are not collected with the cutting heads. The strips to be cut and the sheared cuttings have not taken necessary preservation measures, resulting in dehydration of the strips and cuttings. . When the ear was cut, it was not graded according to the standard size, only the quantity was required, and the shoot section was reluctant to give up, resulting in unequal thickness of cuttings, uneven lengths, unsmooth cuts, and injuries to cuttings. The method of storage and cutting was improper, and the location of the exposed sand was not selected in the shade, and the storage was too shallow or too deep; the sand used was not up to the standard and the cutting was infected by the bacteria. Fourth, the activity of soft tissue at the base of stored cutting roots was not obvious, and there was no sign of “fatâ€. 3. The cuttings and cuttings are completely inserted into the soil, and the apex of the buds are not exposed on the ground. It is difficult for the cutting buds to break through the soil layer, which may cause buds to burn or rot. After being covered with the mulching film, cuttings are directly inserted, which results in sticking of the basal membrane of the root of the cutting root, impeding the absorption of respiration and nutrients, and affecting the formation of adventitious roots. 4. Management did not promptly fill water or irrigation water after cutting and did not guarantee soil moisture. Improper application of herbicides during the false-active period resulted in injury. The arable soil loosened the cuttings and created gaps between the cuttings and the soil. It was found that the leaves of the false live seedlings were not watered or measures were taken after they were yellowed. Second, the corresponding response 1. Select the appropriate cutting time deciduous seedling cuttings generally in late March to late April, autumn in the 11 to 12 months before the soil should be frozen. The regeneration ability of the annual cuttings is the strongest, and the annual sprouting of the mother tree rhizome can be used, and the diameter should reach 0.8 cm or more. 2. Proper handling of the species should be based on the principle of "with cutting with cut and cut", rough branches short cut, twigs stay long, cutting length of about 15 cm, the thickness of the separation, tie baling. If the autumn storage cuttings are cut in spring, the open sand method can be used. Choose leeward sunny, well-drained land to dig trenches with a depth of between 50 and 70 cm. Sticks should be stored and checked monthly for temperature and humidity. Storage matrix should meet the standard of pure sand. 3. Pay attention to the protection of the terminal buds, to prevent the insertion of cuttings with a cutting depth of 3/4. It is advisable to use mulch film to cover the cuttings. The mulch should be cut and then cut. Autumn cuttings are vulnerable to air-drying and freezing damage. After cutting, the soil should be covered with soil. When the spring sprouts, the cover soil will be opened again. 4. After the cuttings, the first time of watering should be filled and permeated thoroughly. Afterwards, the soil should always be kept moist to ensure soil protection and loose soil. Part of the leaves should be removed during the artificial period. In order to promote the rapid formation of root system, three to five times of foliar fertilizers can be sprayed in the pseudo-live period. When it is found that the false live seedlings are inferior, they should be promptly removed to prevent rot.
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