What are the external factors affecting the rooting of flower cuttings?
There are many factors that affect the rooting of cuttings, of course, it is the difference of genetic characteristics. However, according to the general characters, it can be considered from several aspects:
1. Substances necessary for rooting: through a large number of experimental analysis, it is found that rooting inhibitors: it is generally believed that cuttings contain substances that hinder rooting, such as tannins, resins, organic acids and so on. These substances can weaken or prevent the effect of plant growth hormone, while these substances remain on the surface of the incision, affecting the water absorption of cuttings, thus reducing the rooting ability. Soaking the base of cuttings with alcohol or hot water can enhance the rooting effect to a certain extent.
two。 Drought and rot of cuttings: cuttings seriously affect rooting due to wilting, resulting in cuttage failure, and the main cause of wilting is drought and rot. Drought is due to the dryness of the cuttings in the process of transportation or cutting or after cutting, and the excessive lack of water caused by large evaporation, so that the rooting activities of cuttings are seriously damaged and even withered. Therefore, it is necessary to strengthen the water condition management of the bed, reduce the transpiration surface trifoliate orange or take shading measures to reduce the transpiration intensity and prevent wilt so as to ensure the survival of the report.
The rot is caused by the infection of the pathogen in the incision at the base of the cuttings. After decay, the cuttings can not absorb water or die because of the loss of metabolic ability. Therefore, it is necessary to strengthen the protection of incision and disinfect the bed substrate, which is very effective to prevent decay and improve the survival rate of cuttings. It is very important to choose appropriate inserting material for perishable cuttings. Raw soil with no or less organic matter can prevent decay to a certain extent. Cuttings of perishable succulent plants, such as cactus, should be placed in a cool and dry place before stem cutting, and good results can be achieved when the incision is healed. Therefore, in cutting, attention should be paid to prevent wilting caused by drought or decay, create good cutting bed conditions and other environmental conditions, promote cuttings to take root as early as possible, and shorten the dangerous period before rooting as far as possible.
3. Age and maturity of cuttings: by comparison, it is found that it is difficult to survive by cutting branches collected from old trees, but it is easy to survive by using young trees or overgrown branches that germinate on the trunk. For example, the rooting rate of olive cuttings with annual young branches is 100%, while that of biennial cuttings is reduced to 50%, but it cannot be rooting with old branches of more than three years old.
From the maturity of cuttings, annual branches are easier to root than perennial branches with a high degree of Lignification, and new shoots of the current year are easier to root than annual branches. For example, one-year-old wood cuttings can not be planted, but they can survive with semi-lignified branches in autumn. The reason is that the twig has strong vitality, which is easy to produce new plant primordium and form adventitious root, which is also inseparable from the function of leaf stem. Leaves can not only produce nutrients, but also auxin can promote the formation of root primordium and the growth of adventitious root.