Reasons and countermeasures of "false living" of seedlings

Some of the high-risk scions, cuttings, and newly planted seedlings, although growing several leaves and shoots, eventually stopped growing and withered to death. The essence of this “false living” phenomenon is that the scion does not really co-produce with the rootstock, and the cuttings and seedlings do not grow roots that are truly capable of self-cultivation. "False living" can easily cause farmers' illusions and big ideas, thus losing the opportunity for remedy. Therefore, we must draw lessons from the causes of "false living" and take measures to prevent seedlings from "false living."

High-risk varieties of scions (buds) "false living" The main reasons are: 1 change the kind of tree (intermediate anvil tree) is too old, weak tree vigor, poor growth, citrus fruit trees and other hazards endangered cattle, orchard Extensive management, or even abandon management; 2 improper grafting methods, such as the high citrus varieties in the spring instead of cutting mainly, but the wrong way to belly-based. Due to too many abdomen connections, the buds survived and were found to be at a disadvantage due to the competition for nutrients in the rootstock trees. After cutting, the rootstocks that grow upright and have strong growth potential should be selected for the anvil grafting. In fact, the opposite happens, the grafted rootstock branches have weak growth potential, and the scions do not get nutrients; 3 the high-risk period is not suitable. For oranges, it was originally suitable for spring and early March to mid-April, and autumnal autumn and mid-August to mid-September to late September. In fact, the roots of rootstock trees have been germinated in large numbers and the temperatures are too high. The air is too dry, the buds of the scions have germinated and the nutrients have been exhausted when the nutrients have been consumed; 4 The crowns are left unattended. After the “cutting head” or the sprouting of the rootstock tree is used, some canopies “Renxian” are not cut off in time, and due to supply shortage of nutrients, etc., false living is caused.

Prevention and control measures: To select the appropriate period, strong growth, younger age of the fruit tree, the appropriate parts of the high grafting; grafting attention to the rootstock old tree crown to stay in time and promote the formation of a new canopy; application of good buds Fertilizer and strong bud fertilizer, and strengthen the prevention of pests and diseases.

Cutting "false living" With hardwood cuttings method to breed grapes, pomegranate seedlings, some of the upper part of the seedlings gave birth to a few leaves and a vine shoot, then stop growing and then wilt. The reason for this is that the moisture and nutrients in the cuttings have been used up and the roots have not yet been rooted. Therefore, it is not possible to absorb water and nutrients from the soil and supply them to shoots.

Prevention and control measures: Before cutting, use 10000 times abt rooting powder to soak the cuttings for half an hour to promote the hair roots and multiple hair roots; if possible, first use vermiculite, perlite or river sand to make the bed, and warm the bed to 8 °C ~ 10 °C, then gradually rose to 14 °C ~ 20 °C; to be inserted into the roots of the lower part of the root and the upper part will germinate into the nursery, after the back watering the bottom water, often to keep the soil moist.

The newly planted tree “false living” is characterized by shoots on the shoots in the ground, without long roots in the underground, and finally the tip of the leaves dies and the entire plant dies. The main reasons are: thin and weak seedlings, poor quality; the soil is not yet compacted when planting, the roots and soil are not tightly connected, the root system is “overhead”, due to the large gaps, evaporation of water in the soil, resulting in dry; fall early or spring Planting too late; planting too shallow or too deep; animal trampling and so on.

Prevention and control measures: selection of high-quality large seedlings and planting, small planting of the seedlings after one year of planting; vigorous promotion and selection of container seedlings, because the root system is not damaged, the survival rate after transplantation is high; choose the best period of planting, take the seedlings as little as possible Injuring the root system; when planting, special attention should be paid to “raising seedlings and driving the soil”, and the soil should be stepped up to ensure that the root system is in close contact with the soil; the planting is not too deep, but it is not too shallow; after planting, the rooting water must be poured to cover the mulch, often Keep the soil moist; the low-lying and easy-to-eat orchards must do well drainage.

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