The development of citrus fruits has stages, which can be roughly divided into cell division, cell expansion, and maturity. At present, the vast majority of citrus fruits are in the puffing period. It is reasonable to say that the citrus growth rate during this period is the fastest, but some fruit farmers have reported that citrus fruits are slow to puff and do not grow. What is the reason?
Four reasons make citrus "small"
Still in the stage of physiological fruit drop
According to past experience, the second physiological fruit drop of citrus usually occurs when it enters the stable fruit period in early July. However, in recent years, the abnormal climatic conditions and the changes in cultivation techniques have made the two falls generally extended, some even more than one month.
Missing fruit element
Many people only think of potassium fertilizer when they talk about expanding fruits. In fact, when citrus fruits expand, they have demands for nitrogen, phosphorus, calcium, magnesium and other middle and trace elements. Of course, it also includes carbon, hydrogen, and oxygen.
For example, carbon is the basic building block of organic matter in plants; hydrogen and oxygen are water, and the fruit expansion period of citrus is also called the watering period; the nitrogen requirement of citrus during the expansion period is similar to potassium; phosphorus can promote cell division; magnesium can improve photosynthesis Energy efficiency, etc.
Uneven distribution of nutrients
The nutrient of the citrus tree body is limited. When there are too many fruits or the contradiction between the top fruits is intense, the nutrient distribution of the fruits will decrease, causing slow fruit expansion and small fruits.
Weak tree
The leaves are less yellow and weak, and the organic nutrients accumulated in the tree are relatively small. It is difficult to supply the fruits for the expansion of the fruit and the growth of the shoots, resulting in slow fruit expansion and small fruit.
In addition, improper circumcision in the early stage causes root starvation, waterlogging damage causes long-term hypoxia in the root system, drought stresses root growth, improper application of fertilizer damage to burning roots, etc., will greatly reduce the absorption efficiency of fertilizer and water, resulting in citrus not growing.
To be big and willing to lose fruit
Ensure nutrient supply
In this period, in addition to the coordinated application of nitrogen, phosphorus, and potassium, the appropriate amount of calcium, magnesium, and zinc should also be emphasized to ensure the normal supply of fruit expanding elements and reduce the occurrence of fruit cracking, premature aging, and sunburn.
For prosperous trees with few fruits: If the fruit expands slowly, the contradiction between the top fruits is more serious. It is recommended to control nitrogen and potassium and add medium and micro-fertilizers to adjust tree vigor and expand fruit shape. It can be postponed until mid-August.
For weak trees with many fruits: a certain amount of total nutrient fertilizers should be appropriately added, such as peanut bran water + high-potassium water fertilizer, to help stabilize the tree and fruit.
Root and leaf protection
The root system is the basis for the absorption of fertilizer and water, and the leaves are the manufacturing workshop of organic nutrients. Therefore, the fruit expansion period is very critical for the maintenance of the root system and leaves.
The maintenance of the root system is mainly to provide a good soil environment. During this period, we must do a good job of water control, flood prevention and drought resistance. At the same time, some water and fertilizer containing humic acid and seaweed extract can be sprayed to improve the physical and chemical properties of the soil, strengthen roots and promote roots. Improve its resilience.
For the leaves, we must focus on preventing harmful mites, leaf miners, bugs, weevil, thrips, cankers, anthracnose, brown spots, etc., and also prevent sunburn.
Reasonable fruit thinning
For trees with too much fruit, remove diseased and insect fruit, deformed fruit, cracked fruit, and abnormal fruit, and cut off shady branches, diseased branches, etc., to enhance the light transmittance of the tree, and improve photosynthesis to ensure the effective supply of nutrients.
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