The autumn shoot is the result of the citrus's coming year. The autumn shoots are strong and mature, which is very helpful for the growth of citrus in the coming year. But citrus does not put the autumn shoots is a very headache, today I will share with you what is the reason why citrus does not put the autumn shoots, what should I do?
Recently, the continuous high temperature and drought in the south has made many orange farmers very embarrassed. In addition to working in the field against the scorching sun, what makes them worry is the autumn shoots that have not been released. Generally speaking, citrus shoots take 40-45 days to mature. If the autumn shoots are too late, they will delay their maturity. Later, they will involve tree nutrients, slow down the speed of fruit expansion, and also reduce flower bud differentiation. The accumulated temperature time, especially for trees with positive or high yields and large amount of fruit, has a greater impact.
Why is citrus not out of heat when it is hot and dry?
Root damage
The root is the main organ for citrus to absorb water. When the citrus roots are subjected to water stress due to soil drought, the outer skin of the root is damaged, and most of the roots are destroyed and dissolved. The tip and root are closely connected, the root system is damaged, and the tipping is bound to be difficult.
At the autumn stage of citrus, the key period of fruit enlargement, new shoots and root growth is needed. The roots are damaged by drought, the ability to absorb fertilizer is sharply reduced, and the nutrient absorption can not keep up with consumption. At this time, the fruit has basically stabilized. The dominant position in the competition of the fruit is difficult to fix.
Base fertilizer slow
Although many fruit farmers have applied the autumn shoot fertilizer before, the composition of the autumn shoot fertilizer is mainly composed of organic fertilizer + quick-acting compound fertilizer. The slow and long-lasting effect of organic fertilizer is to provide nutrient guarantee for the whole autumn season, while the quick-acting compound fertilizer is the driving force for “promoting the shootâ€.
However, the long-term drought leads to slow dissolution of the compound fertilizer, slower onset of action, failure to achieve the effect of promoting the shoots, and damage to the roots, and the root system is not able to be effectively absorbed, and the new shoots are difficult to extract.
The tree is affected by drought
The leaves are the most sensitive organs for citrus to respond to water stress. If the drought is long-term, the ultrastructure of leaf cells and chloroplasts will change, the arrangement of chloroplast granules will be disordered, and even in severe cases, it will disintegrate and affect its photosynthetic energy efficiency.
Shoot growth is blocked during drought, often manifested as early maturity and stop growing or difficulty in pumping, mainly because drought inhibits cell division
Effects of long-term arid environment on the growth of citrus shoots
In long-term dry environments, the amount of citrus new shoots is much lower than under normal conditions, especially the source of autumn shoots: Fan Weiguo
Drought will increase the concentration of sap, break the balance between vegetative growth and reproductive growth, promote flower bud differentiation, and even have the possibility of autumn flowers, increase the abnormal consumption of tree nutrients, and hinder the extraction of new shoots.
When the citrus is dry, the total trend of hormones in the body is that the hormones that promote growth decrease and the hormones that delay or inhibit growth increase, which is difficult to produce.
Citrus does not put the autumn shoots
Citrus is not self-protecting when it is not exposed to high temperatures and droughts. Imagine that if the new shoots are extracted, the transpiration will undoubtedly increase, and the tree body will be more affected by water stress. Therefore, it is a major premise to promote drought prevention.
Do a good job in drought relief: measures include irrigation, tree cover, grass cultivation, water spray, etc., but irrigation is most effective and direct. Irrigation should be carried out every morning and evening. Remember not to wait for the severe drought in the orangery and then flood the water to avoid causing a lot of cracking, filling and filling each time.
Enhance the nutrition of the tree: Spray the sea elf bio-stimulant (foliar type) 800~1000 times on the canopy to enhance photosynthesis, supplement the tree nutrients, and strengthen the fruit; on the other hand, the sea elves contain Humic acid and seaweed extract can promote the increase of proline content in plant leaves, promote the water-holding capacity of cells, increase the activity of plant cell protective enzymes, and reduce the permeability of cell membrane to improve the drought resistance of citrus.
Maintenance root system: 300 times solution of sea snail bio-stimulant (root type) to repair damaged roots, improve fertilizer efficiency and absorption capacity, and facilitate new shoots. It is recommended to use ditching and dredging. After the drought, the surface of the soil is crusted. It is difficult for water poured on the ground to penetrate into the soil below 5 cm, and it is easy to evaporate. The utilization rate of fertilizer and water is very low.
Matters needing attention: 1 If the drought persists, we must persist in the work of drought relief. After the new shoots come out 5cm, increase the application of phosphorus and potassium fertilizer to promote the ripening and reduce the transpiration consumption. 2 If the drought is particularly serious, you should give up the shoots to protect the trees, and stay in the green hills, not afraid of no firewood.
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