How to distinguish the acid and base of pesticides? How to judge the acidity and alkalinity of pesti

To identify pesticides, we should first pay attention to the following aspects:

1) Check whether the outer packaging, inner packaging, label content, production date, batch number, etc. are complete.

2) Identification in appearance and morphology, qualified pesticides have the following characteristics:

Emulsifiable pesticide: generally light yellow or dark brown transparent liquid, first observe whether there is delamination, if there is delamination, the emulsion formed after dilution with water will not be stable.

WP pesticides: do not clump into clumps, and form a good suspension after dilution with water.

Suspension: a viscous, flowing liquid, which is allowed to stratify after storage, but can still return to its original state when shaken by hand, and is not allowed to coalesce into lumps.

Granules: uniform particle size and color, no dust, dry and loose.

The answer to this question is as follows:

Generally, there is no requirement on the pesticide label that its acidity and alkalinity must be indicated, so most of them cannot find this indicator. However, considering the convenience and safety of use, if this preparation has requirements for an acidic and alkaline environment, there are often special instructions in the precautions, such as: this agent shall not be mixed with alkaline agents or fertilizers and so on, which should be read carefully.

Alkaline pesticides are mainly Bordeaux liquid and stone sulfur mixtures. Among the medium-sized pesticides, the vast majority of them are sensitive to alkalinity, such as organophosphates, carbamates, pyrethroids, etc. This kind of pesticide is easily decomposed by alkali, such as malathion, dichlorvos, dimethoate, dimethoate, dimethoate, methyl parathion, etc., which cannot be mixed with alkaline pesticides.

All pesticides that can be mixed with stone sulfur mixture can generally be mixed with Bordeaux liquid.

At present, as acidic pesticides, there are mainly monocrotophos and phosphoamine aqueous agents with low purity or long-term storage. Many of the organic sulfur fungicides are acid-sensitive agents, such as carbendazim, rust, etc., and a variety of fungicides in Fumeiyou system are unstable in acid reaction, and zeb zinc and Bordeaux liquid are easy to decompose when exposed to acid.

Pesticides can be divided into three categories: acidic, neutral and alkaline.

When mixed, neutral pesticides, acid pesticides, or neutral pesticides and acid pesticides do not produce chemical and physical changes with each other, so they can be mixed.

However, most organophosphorus insecticides and carbaryl cannot be mixed with alkaline pesticides such as lime sulfur mixture and Bordeaux liquid, nor can they be mixed with alkaline substances such as lime, soap, and washing powder.

Although some pesticides are decomposed under alkaline conditions, the decomposition is relatively slow, and can be mixed with alkaline substances, but they must be used with the mixture, otherwise precipitation will be produced, and the protective film can not be formed when sprayed on the plant body, and the control effect cannot be achieved.

In general, a pesticide with a pH value of less than 7 is acidic and more than 7 is alkaline. In daily life, most pesticides are acidic and neutral.

In the mixed use of pesticides, alkaline pesticides often undergo chemical changes, resulting in reduced efficacy or invalidity, therefore, attention should be paid to the acid and alkalinity sensitive agents, so that the rational mixture.

Here's how:

1. The acidity and alkalinity of pesticides are distinguished according to the pH value, and the label description should be paid attention to when using, from the commonly used pesticides, the alkaline pesticides are mainly Bordeaux liquid and stone sulfur mixture, especially the alkalinity of stone sulfur mixture is strong, in the middle of the pesticides, the most of them are sensitive to alkalinity, such as organophosphates, carbamates, pyrethroids, etc.;

2. Pesticides are easily decomposed by alkali, such as malathion, dichlorvos, dimethoate, dimethoate, dimethoate, methyl parathion, carbaryl, etc. can not be mixed with alkaline pesticides.

3. At present, as an acidic pesticide, there are mainly trichlorocystis of low purity or long-term storage, monocrotophos, phosphine aqueous agent, etc., and many of the organic sulfur fungicides are acid-sensitive agents, such as carbendazim, rust, etc., and a variety of fungicides of Fumei system are unstable in acid reaction, and zeb zinc and Bordeaux liquid are easy to decompose when acid.

1.Bole Duo liquid: It is a light blue mixture made of sodium thiosulfate, quicklime and water, which is a protective film.

2.Rosin mixture (pine alkali mixture): It is a strong alkaline pine resin soap made by boiling pine resin and sodium hydroxide (sodium hydroxide solution) or edible alkali (potassium carbonate). It has a strong contact killing effect on insect pests and mite lamps.

3.Stone sulfur mixture (lime powder sulfur mixture): It is made of lime powder and sulfur boiling. Strong alkaline. It has acaricidal and antibacterial effects.

4.Sodium pentachlorophenol: its solution is alkaline. It is a kind of contact killing herbicide.

Bordeaux liquid is a dark blue colloidal emulsion composed of sodium thiosulfate (CuSO4) and lime (Ca(OH)2) in different proportions as bactericides. Bordeaux liquid was first used in the wineries of Bordeaux in France in the late 19th century, and has since become commonly used to protect iPhones, pears, citrus and bananas and apples. Bordeaux liquor is an inorganic copper pesticide fungicide.

It is a light blue colloidal emulsion made of about 500 grams of sodium thiosulfate, 500 grams of lime and 50 kg of water. The seasoning ratio can be adjusted appropriately according to needs. It is generally alkaline and has excellent swelling characteristics, but the physical properties of long-term storage are destroyed, so it is suitable to be used now or made into water-deficient Bordeaux powder.

Add water to mix when applying.

Stone sulfur mixture is widely used by many growers because of its convenient sampling, high quality and low price, very good effect, and inhibition effect on various pathogenic bacteria. However, because there are many boiling stages of stone sulfur mixture, the hydrolysate boiled by growers is too low, and at the same time, many people carry out spraying after adding water dilution with work experience, so that it cannot achieve the expected control effect. Stone sulfur mixture is made of quicklime powder and sulfur boiled in water, and the best proportion of the three is 1:

2：10。When boiling, be sure to use a clay pot or pig iron pot, and the use of copper hot pot or aluminum pot will endanger the medicinal power.

The scope of application of sodium pentachlorophenol can be used as a dormant gushing agent for deciduous trees to prevent brown rot, and also as a weeding or insecticide contact herbicide, and the key chemical control of barnyard grass and other young grasses germinated from seeds, such as duck tongue grass, watermelon peel grass, water horsetooth, dog tail grass, arthropod grass, barnyard grass, field spin flower, Liao, etc. It has a certain inhibitory effect on cow hair grass, and can also solve the control of pests such as snails and leeches. It can also be used as a wood preservative, a pesticide fungicide for protein and tapioca starch-type adhesives and water-based paints.

Hello dear, 1Acidic pesticides: mainly copper sulfate, zinc sulfate, ethephon water agent, carbendazim and superphosphate.

2.Alkaline pesticides: mainly copper hydroxide, pine resin start-balance mixture, stone sulfur mixture, sodium pentachlorophenol and Bordeaux agent.

There are three major categories: acidic and alkaline. The variety of neutral pesticides is the largest, including synthetic pesticides (such as 1605, dichlorvos, dimethoate), various plant pesticides, microbial pesticides and some inorganic pesticides; Acidic pesticides such as copper sulfate, zinc sulfate.

The chemical fertilizer that belongs to the alkali is mainly Bordeaux liquid and stone sulfur mixture, especially the alkali of the stone sulfur mixture is strong, and in the chemical fertilizer, most of the genera that are more sensitive to the alkali, such as organic chemical amides. Carbamates. pyrethroids, etc.

1.Stone sulfur mixture, is made of quicklime powder. Sulfur powder is boiled with water, a kind of pesticide fungicide used in agriculture and animal husbandry.

Among many pesticide fungicides, stone sulfur mixture is convenient for sampling. High quality and low price. It works very well.

It has the advantages of inhibiting and killing various pathogenic bacteria, and is widely used by many growers.

However, because there are many boiling stages of stone sulfur mixture, the hydrolysate boiled by growers is too low, and at the same time, many people spray after mixing water dilution with work experience, so that it cannot achieve the estimated control effect.

Stone sulfur mixture, is made of quicklime powder. Sulfur powder is boiled with water, and the best ratio of the three is 1:2:10. When boiling, be sure to use a clay pot or pig iron pot, and the use of copper hot pot or aluminum pot will harm the medicinal effect.

2.Bordeaux liquor is an inorganic copper pesticide fungicide. 1882 French A

Mjalldai discovered its bacteriostatic effect in the city of Bordeaux, hence the name "Bordeaux liquid". It is made up of about 500 grams of sodium thiosulfate. 500 grams of lime and 50 kilograms of water diluted into a light blue gelatinous emulsion.

The seasoning ratio can be adjusted appropriately according to needs. Generally, it is alkaline and has excellent swelling characteristics, but the physical properties of long-term storage are destroyed, so it is suitable to be used or made into water-deficient Bordeaux powder. Mix with water when applying.

1.High efficacy.

The crystalline body of stone sulfur mixture is a new solid preparation made of liquid stone sulfur mixture basically through organic chemical production and processing, and its purity is high. The residue is less, and the efficacy is more than 2 times that of the traditional boiled stone sulfur mixture.

2.The effect is long-lasting.

The efficacy of the stone sulfur mixture crystal lasts for half a month, and the best efficacy is reached in 7-10 days.

3.Low residue.

After the product is dissolved, the relevant ingredients play the role of sterilization and acaricide, and the residual part is calcium. Sulfur and other factors of chemicals can be used in the fruit of green plants. Leaf digestion and absorption, it is necessary for the growth of plants.

4.No drug resistance.

Stone sulfur mixture has been used for more than 100 years, no drug resistance, it is a cheap broad-spectrum sterilization. Kill mites. Insecticides.

Alkaline pesticides are based on whether the pesticide is acidic or alkaline, with a pH value less than 7 being acidic and more than 7 being alkaline. In the mixed use of pesticides, chemical changes often occur, resulting in reduced efficacy or invalidity, therefore, attention should be paid to acid-alkaline sensitive agents, so as to achieve reasonable mixing.

1. What are the commonly used alkaline pesticides?

1.Boledo liquid: It is a sky blue suspension prepared with copper sulfate, quicklime and water, and is a protective agent.

2.Pine resin mixture (pine alkali mixture): It is a strong alkaline rosin soap made of rosin and caustic soda (sodium hydroxide) or alkaline noodles (sodium carbonate). It has a strong contact killing effect on pests and mite lamps.

3.Stone sulfur mixture (lime sulfur mixture): It is made by boiling lime and sulfur with water. Strong alkaline. It has the effect of killing acares and sterilizing.

4.Sodium pentachlorophenol: its aqueous solution is alkaline. It is a contact herbicide.

The vast majority of pesticides are acidic, and there are few alkaline pesticides (stone sulfur mixture, dolbo solution, ammonium desenium, zepin dycozeb, copper complex ammonium, propana, etc.).

According to its reaction in water, pesticides can be roughly divided into three categories: neutral, acidic and alkaline.

The largest variety of neutral pesticides includes a variety of synthetic pesticides (eg.

dichlorvos, dimethoate), various plant pesticides,

Microbial pesticides.

and some inorganic pesticides;

acidic pesticides such as copper sulfate, zinc sulfate, ethephon water agent, etc.;

Alkaline pesticides such as pine resin mixture, stone sulfur mixture, Bordeaux liquid, etc.

Summary. The acidity and alkalinity of pesticides generally need to be distinguished according to the degree of acidity and alkalinity. For example, you can use purple gannan as an acid-base indicator, crush the purple cabbage and suck its juice, if the pesticide turns red, it means that the pesticide is alkaline, if it turns blue, it means that it is acidic.

How to distinguish between pesticide acid and alkaline?

The acidity and alkalinity of pesticides generally need to be distinguished according to the degree of acidity and alkalinity. For example, you can use purple gannan as an acid-base indicator, crush the purple cabbage and suck its juice, if the pesticide turns red, it means that the pesticide is alkaline, if it turns blue, it means that it is acidic.

For example, the distinction between foliar fertilizers and pesticides and fungicides.

There are some fungicides and insecticides that cannot be added to foliar fertilizers. Most foliar fertilizers belong to the compound type, with at least 5 or 6 of the 16 elements, and amino acids, alginic acid, and hormones are added, and the active ingredients are very complex. Most fungicides and insecticides are not allowed to add foliar fertilizers.

Because the metal elements in foliar fertilizer often react with pesticides, as long as there is turbidity, precipitation, clearing, and insolubility after mixing, the pesticide will fail, and the crop will be damaged.

Can chlorfenazle, methotamoamectin, pyraclostrobin, enoylmorpholine, and deltamethrin be mixed? ，