The use of herbicides requires strict control

For weeding crops, the application of herbicides is the most convenient and most efficient way, but if it is difficult to get the correct effect of the herbicides, then what is the correct way to use the herbicides?

First, strictly control the amount of medication

Due to the close relationship between weeds and crops, the amount of drug used is too large to damage the cockroaches and the cockroaches, and the dosage should be much stricter than the application of pesticides and fungicides. The herbicide dosage is usually expressed in the active ingredient of mu. The amount of various herbicides is from 5g to 200g (more than 50-100g). It should be used strictly according to the dosage required by the instructions. Drug damage. However, some herbicides can increase the scope of prevention and control by appropriately increasing the dosage. If the amount of weeds is 40-50ml/mu, the increase in weeds to 130-167ml/mu can prevent perennial weeds.

In addition, in the production of certain herbicide dosage, in addition to the description, we should also consider the size of weeds, soil texture, organic matter content, soil moisture, temperature and other factors, generally high in weeds, high in clay and organic matter. In the case of drought and low temperature, the dosage should be increased, and vice versa. In short, the upper or lower limit of the required amount in the manual should be selected according to the local conditions at that time.

Second, the way to remove the grass and the role of action

The herbicide herbicides mainly include contact and inhalation. The former can only kill the local tissues of the weeds in contact with the agent, and can not be transmitted in the body. Generally, only the annual weeds, such as herbicide ether, can be killed. It is absorbed by weeds and transmitted in the body, which can kill perennial deep-rooted weeds, such as glyphosate and thatch. In addition, the contact points of the herbicides are the stems and leaves of the shoots (Yor, Linon), some of them are buds (such as trifluralin), others are roots (such as green merlon), and some have two points of action. If the thatch is absorbed, it can be absorbed by the stems and leaves and absorbed by the roots. This determines that some herbicides are not effective against unearthed weeds, such as trifluralin, which can only be used for soil treatment before sowing. Some herbicides are not effective for unearthed weeds, such as glyphosate must be weeded. Seedling stage for stem and leaf treatment. In summary, the mode of action and the point of action of clearing the herbicide are the basis for determining the method and time of application.

Third, the choice of lifting grasses between weeds and crops

When applying herbicides, the differences in morphology, physiology, growth and development, and some characteristics of herbicides can be utilized to avoid phytotoxicity to crops. There are four ways.

1. Time difference selection: Using some short-term residual effects of herbicides, application before emergence or after seeding of crops will not affect crop germination and growth, such as simazine to prevent corn field weeds from being safely used before corn sowing effective.

2, the choice of position: using weeds and crop plants and the depth of the root system, the herbicide applied to the weed stems or soil surface, but not harmful to plants with taller and deeper roots, such as extinct Glyphosate is used for weeding in orchards.

3. Morphological selection: Some herbicides use the dicotyledonous plants in terms of leaf width, angle, thickness of the stratum corneum and whether the growth point is bare. In the same application, the dicotyledon leaves are broad and flat. The area of ​​the medicine is large), the stratum corneum is thin (the drug is easy to spread and infiltrate), the growth point is bare, and thus it is easy to be killed. The monocotyledonous plants can be protected from harm, for example, the 2,4-D type is suitable for the grass crops in the field. Leaf weeds fall into this category.

4. Physiological selection: Some crops have special hydrolyzing enzymes that can decompose the herbicides without harm. Weeds are killed without this function. For example, the use of cockroaches in rice fields is safe for rice. In practical application, it is necessary to determine which method to use to protect crops according to the characteristics of crops and weeds. If the weeding uses the difference in the selection of vegetation, the time difference and shape selection of weeding in crop fields are used. In addition, some crops have natural resistance to some herbicides, such as corn, soybeans, and peanuts, which have strong resistance to pull cables, rice has strong resistance to cockroaches, and wheat has strong resistance to chloromeron. It should be given priority.

4. Clear herbicide weeding objects

Herbicides have a wide range of weeding, most varieties are selective, have a certain range of weeding, and some can only kill annual weeds, such as diuron; some are suitable for killing dicotyledon weeds, such as 2, 4-D; some suitable for killing monocotyledonous weeds, such as cable, need to be selected according to the species of farmland weeds. A few are extinct, all green plants can kill, but the use is unsafe, more suitable for orchards, woodland and non-cultivated land, such as glyphosate.

Fifth, choose the appropriate application method and time

The specific application methods of herbicides include spray-spraying surface, mixed soil after spraying surface, spreading soil and spraying stems and leaves. The first three methods are mainly used for herbicides with buds and roots, which are used for weeding crops. More methods; whether the soil is mixed after the surface is sprayed. First, according to the characteristics of the medicament, some are easily photolyzed, and must be mixed immediately after spraying, such as trifluralin; some need to be effective under light conditions, then it cannot Mix soil, such as herbicide ether. The second is whether the soil can be mixed or not. Whether the soil is mixed depends on the soil moisture. When the soil is dry, it should be mixed in time and suppressed. Spraying stems and leaves (or stem and leaf treatment) is used as a herbicide for leaves, such as bentazon, stable killing, etc., should be applied when the weeds are small, and pay attention not to spray the medicine on the crop. In addition, from the perspective of crops, the application time is three periods before sowing, before sowing, and after emergence. The first two periods are soil treatment. After weed emergence, the stems and leaves are generally treated, but it should be used in the stage of strong resistance of crops, or after weeding and weeding.

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# According to the naming and definition of (GB8075-87) admixture, the admixture can be divided into 16 names, each of which is defined as follows:
1. Ordinary water reducing agent: an admixture capable of reducing the water consumption of mixing under the same conditions of concrete slump;
2. Early strength agent: an admixture that accelerates the early strength development of concrete;
3. Retarder: an admixture that prolongs the setting time of concrete;
4. Air entraining agent: an admixture capable of introducing a large number of uniformly distributed, stable and closed microbubbles during the process of mixing concrete;
5. Superplasticizer: an admixture that can greatly reduce the water consumption of the mixture under the same conditions of concrete slump;
6. Early strength water reducing agent: a water reducing agent with both early strength and water reducing function;
7. Retarding water reducing agent: a water reducing agent with both retarding and water reducing functions;
8. Air entraining water reducing agent: an admixture with both bleed air and water reducing functions;
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Guangxi Nanning Zhuoyu Building Materials Trademark
9. Water repellent: an admixture that reduces the water permeability of concrete under hydrostatic pressure;
10. Rust inhibitor: an admixture that inhibits or reduces the corrosion of steel or other embedded metals in concrete;
11. Air entraining agent: an admixture that can form a large amount of pores in concrete due to the chemical reaction to release gas during the preparation of concrete;
12. Expansion agent: an admixture that causes a certain expansion of the concrete volume;
13. Antifreeze: an admixture that can harden concrete at a negative temperature and achieve sufficient antifreeze strength within a specified time;
14. Coloring agent: an additive capable of preparing a concrete having stable color;
15. Accelerator: an admixture that can harden concrete quickly;
16. Pumping agent: an admixture that improves the pumping performance of concrete mixes

Concrete Water Reducer

Methylene dimethyl dimethyl naphthalene sulfonate polymer

Jinan Huijinchuan Chemical Industry Co., Ltd. , https://www.hjcchemical.com