Before talking about the requirements, let’s answer the many questions raised such as “What is a fertilizer solution?” “What is a nutrient solution?” “What is a growth regulator?”

First, fertilizer liquid: it is commonly used fertilizer, a liquid prepared by adding water. The fertilizer solutions sprayed on the crown of Dongkui Bayberry include:

Potassium sulfate: the fertilizer solution that is used most often and has the best effect every year. Commonly used concentration is 0.2%. The main functions are: promoting tree vigor recovery, increasing fruiting rate, promoting fruit development, increasing fruit soluble solids, improving fruit quality, etc. Periods of use include: after fruit picking, during the development period of young fruits, during winter, etc.

Potassium dihydrogen phosphate: Its main function is to promote fruit development and improve fruit quality, especially for trees knocked down by typhoons. It can be used multiple times. The periods of use are: flowering period, young fruit development period, and after disasters. Commonly used concentration is 0.2%.

Superphosphate: Spray during the flowering stage and young fruit stage. Its main function is to reduce deformed fruits. The usage concentration is 1% leachate.

Plant ash: Its function and period of use are the same as potassium sulfate. The usage concentration is 2% to 3% impregnation solution. But be careful: Never use highly alkaline plant ash with high salt content.

In addition, there are liquids containing calcium, magnesium, boron, zinc, molybdenum, iron, manganese, copper and other elements, which are used in different periods.

Although urea is a fertilizer solution that is relatively needed for fruit trees, nitrogen solutions such as urea are generally not used for Dongkui Bayberry except when the tree is extremely weak or needs to be restored quickly after being overturned by strong winds. The usage concentration is 0.2%.

Second, nutrient solution: The so-called "nutrient solution" is a liquid prepared by a factory (unit) from a variety of nutrients plus (or without) growth regulators. There are so many names on the market at present, it is really like "Eight Immortals crossing the sea, each showing his magical powers". Taking advantage of the mentality of some farmers with low educational level and narrow knowledge, who are eager for high yield and high-quality fruit trees and are willing to spend money, we can simply change the formula and prepare it into "××宝", "××伟", "×大多", "×" ×King" and other various nutrient solutions. Among so many nutrient solutions, some have better effects on Dongkui Bayberry, some can only have effects, but not significantly; some not only have no effect, but cause a large number of fruit or leaf drops, such as "×most", which means many years. The first time fruit farmers suffered losses. Of course, even the nutrient solution I recommend to everyone, due to various reasons such as different climates and tree conditions in different places, needs to be tested first before being applied on a large area to avoid suffering greater losses.

Third, growth regulators: The so-called plant growth regulators refer to some natural or synthetic organic compounds that affect the growth and development of plants at low concentrations and can also improve quality and increase Yield and other aspects play a role.

Growth regulators are also called “phytohormones” in my country. Some scholars in Taiwan Province of my country refer to plants and animals collectively as "hormones". my country's current plant growth regulators are roughly divided into:

A. Natural hormones: hormones naturally produced in plants, extracted Or artificially synthesized, it can be applied externally to plants to produce a series of physiological effects. Such as indole acetic acid, abscisic acid, gibberellins, etc.

B. Hormone-like compounds: To synthesize compounds with a certain hormone-active structure. These compounds are similar to some or all of the properties of endogenous hormones. Such as naphthalene acetic acid and indole butyric acid. There are naturally occurring cytokinins and synthetic kinetins.

C. Ethylene releasing agents and inhibitors: ethephon and CGA15281 are both ethylene releasing agents. When ethephon enters the plant, it slowly decomposes under higher pH conditions and releases ethylene. Due to the autocatalytic effect of ethylene, the production of endogenous ethylene is stimulated and the effect is increased. CGA15281 is a silane derivative that also releases ethylene when in contact with water. Ethylene inhibitors can be divided into two categories: ethylene biosynthesis inhibitors and ethylene effect inhibitors. For example, aminovinylglycine and aminooxyacetic acid can inhibit the biosynthesis of ethylene and are used to inhibit fruit shedding and ripening. Carbon dioxide is an inhibitor of the ethylene effect.

D. Inhibitors of hormone transport: such as triiodobenzoic acid and plasticine, which hinder the transport of auxin downward from the terminal bud, relieve the inhibitory effect of auxin on lateral buds, and allow dormant lateral buds to germinate. It forms branches and blocks the transport of gibberellin and promotes the function of flowers.

E. Growth retardants: such as Ala (also known as "Bijiu", "B9") and chlormequat inhibit the expansion and division of cells in the sub-apical region of the stem, causing the shortening of the plant's internodes. However, because the top area of ??the stem is not affected, the size of the leaves, the number of leaves, and the top advantage remain unchanged. Paclobutrazol (also known as PP333) developed in recent years is a promising growth retardant, which is widely used and effective in Dongkui Bayberry.

F. Growth inhibitors: Different from growth retardants, they mainly act on the apical meristem. Its effects are not reversed by gibberellins, such as cyanidin.

G. Other growth regulators: Most of them work by affecting the natural control system of hormones in plants. Such as 2-(4-chlorophenylthio)triethylamine hydrogen chloride, N, N-ethylnonylamine, etc.

Not all of the above seven types of growth regulators are suitable for Dongkui Bayberry. Therefore, please do not use nutrient solution casually. Be careful when choosing.

Let’s talk about some requirements for selecting nutrient solution:

A. The purpose of selecting nutrient solution is to increase the fruiting rate and quality of Dongkui Bayberry. Therefore, avoid using nutrient solutions formulated with elements or growth regulators that promote the growth of branches and leaves.

B. Humic acids or amino acids are different from nitrogen. Therefore, the first two types can be used to promote the fruiting and quality of Dongkui bayberry, while nitrogen-based fertilizer solutions (including urea, ammonium sulfate, etc.) cannot be used.

C. Rare earths (including high-efficiency rare earths, Nongdiwei, etc.) are fertilizers containing a variety of elements. Spraying rare earth liquid can improve the fruiting rate and fruit quality of Dongkui Bayberry and can be used.

D. Growth regulators should be selected carefully. The use of growth regulators cannot promote the nutritional growth or affect the quality of Dongkui bayberry. There are also substances such as 2-4 drops (also known as: 2,4-D. The chemical name is 2,4-dichlorophenoxyacetic acid). Contains carcinogens and is banned by the country and must not be used.

E. There are many nutrient solutions available on the market. Be careful not to use any trademark that has not been approved by the relevant state departments and has no registered trademark.