Citrus February core management technology
In February, everything recovered, the temperature gradually warmed, and the citrus gradually moved from the relative dormant period to the spring budding period. The management focus of this period is to restore the tree vigor, promote the growth of the shoots, and prevent diseases and insects early, which will lay a good foundation for the management throughout the year.
Restore tree vigor
Since the end of last year, the cold wave has been one after another, and many citrus orchards have suffered different degrees of freezing damage.
The horror of freezing damage lies not only in the short-term damage to the tree, but also in the sequelae of the following long period of time. Such as the increase of weak parasitic diseases throughout the year, the difficulty of maintaining flowers and fruits in the early stage, and the decline of fruit quality in the later stage...
The reason is that the winter is originally the recuperation and recovery stage of citrus, through the production, accumulation, and storage of organic matter to provide the nutritional needs of early spring budding, early flowering and even the first half of the year. The frost damage struck, abruptly interrupted the process, not to mention the lack of nutrient accumulation, it also lowered the tree's vigor. Therefore, after freezing damage occurs, the top priority is to help fruit trees quickly restore the damaged tree vigor.
The specific method is to immediately spray the frozen fruit trees with high-quality foliar fertilizers containing seaweed extract and amino acids that can improve the tree’s resistance to stress, such as sea spirit biological stimulant leaf spray type, and phosphorus Potassium source pool improves the nutrient level of the tree.
In addition, some late-maturing citrus varieties are still in the fruit picking period this month, and the next quick-acting fertilizer is required after fruit picking to make up for the nutrient consumption caused by long-term fruit hanging.
About Chunfei
Young tree
For saplings that were planted in the autumn of last year, fertilization should follow the principle of "eat less and more meals". For 1-2 year old saplings, foliar spraying is the main method, supplemented by ground fertilization.
The concentration of ground fertilization should be dilute, do not spread, use nitrogen fertilizer as the main fertilizer, and appropriately mix phosphorus and potassium fertilizers. Before the spring shoots germinate, spray the sea spirit biostimulant root application once to promote spring shoots germination and root growth.
Hanging fruit tree
If there is a small amount of fruit in the previous year, the medium growth of the tree can be used less or not; if the tree has a lot of fruit in the previous year and the fruit harvesting fertilizer is not applied or applied less, the pre-emergence fertilizer must be applied.
Note that when the soil temperature is stabilized at 10℃ or higher, the chemical fertilizer applied prematurely will dissolve and decompose very slowly, and the fertilizer hole and fertilizer will penetrate into the vicinity of the citrus root system. The concentration of the fertilizer solution is high, which is easy to form a reaction. Penetration causes the water in the citrus tree body to flow back into the soil from the leaves, branches and roots, causing fertilizer damage, resulting in undesirable consequences such as fallen leaves and dead branches.
The spring fertilizer is mainly quick-acting nitrogen fertilizer, combined with the spraying of the sea spirit biological stimulant root application type, and combined with the foliar spraying 800 times the phosphorus and potassium source and reservoir, to achieve the purpose of accelerating buds, strengthening shoots and strengthening buds.
Plastic trimming
Young tree
Before the spring buds germinate, top off or short cut the mature autumn and winter shoots, cut off the immature autumn and winter shoots, freeze-damaged shoots, dead branches, diseased branches, etc., all cut and release, and all control. Thin out all flower buds to help expand the canopy as soon as possible.
Hanging fruit tree
Cut off diseased and insect branches, weak branches and residual branches, and cross dense branches; strong and vigorous trees should not be pruned in winter, so as not to trigger more spring shoots and affect stable fruit; weak trees and severely frosted trees should shorten the branches and cultivate the crown.
For dense tree-like plants, you can choose to "open skylights" to thin out large branches; clean the remaining branches in time and burn them outside the garden.
Early pest control
Before sprouting and budding, carry out an early spring clearing of the garden, especially if the clearing work has not been done well in the early stage, we must pay close attention to it. The medicament can choose lime sulfur mixture, mineral oil + tetramazine and so on.
After the spring, the temperature rises, citrus sprouts and shoots to produce a large number of buds, young leaves, and twigs, which are used for spider mites, flower bud maggots, scorpion scales, yellow-pointed scales, black thorn whiteflies, longhorn beetles, and giardia , Leaf rollers, aphids, etc. provide a lot of food. At the same time, anthracnose, foot rot, scab, ulcer, sand skin disease and other diseases began to infect as the temperature gradually increased. To seize the key prevention and control period when the spring buds are one grain of rice, the specific chemical selection will be introduced in detail in the next month's management.
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