Farmers spray herbicides in paddy fields, so why don t herbicides harm rice?

The use of herbicides can only kill weeds without harming food crops, which is the conclusion of the selectivity of using herbicides, or the conclusion of the difference between the characteristics of crops and weeds, and also the conclusion that we conquer nature and defeat nature

Physiological differences: different green plants have different physiological needs for different types of herbicides, such as after the propanium is applied to the rice field, there is an enzyme in the rice seedling body, which can be converted into no harmful substances, which may cause it to be less easily poisoned. And the barnyard grass does not have these substances in the body, so it is poisoned and dies.

Shape differences: different types of green plants, different shapes, spraying, dose size, damage is different. The leaf area index of dicots is large, the dose is more, the bud eyes are exposed, and it is more susceptible to fertilizer.

The leaves of monocots are slender and erect, the dose is small, and the leaves also have a thin or siliceous layer of cuticle, and the bud eyes are covered by double leaves, so they are not susceptible to fertilizer.

Difference in rhizome intensity: Generally, the rhizomes of crops are deeper, while most of the rhizomes of wild grasses are shallow, and they are mostly distributed in the soil layer. Differences in planting and budding time using crops and weeds.

Use some herbicides with short time and good effect, take the medicine before planting or transplanting crops, and kill the grass before planting or transplanting. Or spray before budding after planting, which can effectively solve the wild grass in the first germination stage on the surface.

Classification of herbicides: Herbicides are divided into four categories according to the way herbicides act on plants and the movement of herbicides in the body of green plants. Selective herbicides:

This herbicide is characterized by obvious selectivity for the medicinal power of different plants, that is, it can kill some weeds, but it is ineffective against others; Safe for some crops, but harmful for others. For example, cover grass can have obvious effect on chemical control of grasses, but it is ineffective on broad-leaved weeds. And for broad-leaved plant crop safety.

The reason why the use of herbicides will not harm rice is because herbicides only have an effect on weeds, and it will not play a certain role in some rice, so there is no need to worry about whether herbicides will harm rice?

Different green plants have different physiological needs for different types of herbicides. For example, after the application of dialeos in rice fields, there is an enzyme in the rice seedlings that can be converted into harmless substances, which may lead to less poisoning. However, barnyard grass can be poisoned to death without these substances in its body.

Shape differences: Different types of plants have different shapes. When sprayed, they are subjected to different doses and injuries.

Dicotyledons have a large leaf area index, a large dose, and exposed bud eyes, which are more susceptible to fertilizer.

The growth of different plants is different, as long as the herbicide is used at the right time, it will not cause harm to the plant, which is directly related to the growth of the plant.

Summary. We are happy to answer for you, and here are the results of your inquiry: Rice seedlings cannot be sprayed with herbicides under direct application of pesticides, because pests and diseases may develop in the newly planted rice plants.

In addition, the application of large amounts of chemical agents can also impair the normal growth and development of rice seedlings, leading to decline, which can lead to many unforeseen consequences. In addition, herbicides are generally sprayed while walking, but rice seedlings are easily affected by wind, so the chemicals contaminated can also easily affect the growth and development of rice seedlings. In order to protect rice seedlings from chemical drugs, control pests and diseases, and effectively weed, non-chemical weeding technologies can be adopted, such as mechanical weeding, atomization treatment, physical weeding, biological control and other technical measures.

In addition, blood-paste worms, pest-insectic mosses and other pathogens may have a potential impact on the growth and development of rice seedlings, so regular pest control is necessary.

Yesterday it rained a lot and the land was wet, can you spray herbicides today.

We are happy to answer for you, and the following are the results of your inquiry: Rice seedlings should not be sprayed with herbicides under the direct application of pesticides, because the newly planted rice plants may develop pests and diseases in the plant. In addition, the application of large amounts of chemical agents can also impair the normal growth and development of rice seedlings, leading to decline, which can lead to many unforeseen consequences.

In addition, herbicides are generally sprayed while walking, but Songshan rice seedlings are easily affected by wind, so the chemicals contaminated can also easily affect the growth and development of rice seedlings. In order to protect rice seedlings from chemical drugs, control pests and diseases, and effectively weed, non-chemical weeding technologies can be adopted, such as mechanical weeding, atomization treatment, physical weeding, biological control and other technical measures. In addition, haematoid worms, pests and other pathogens such as cherry blossoms may have potential effects on the growth and development of rice seedlings, so regular pest control is necessary.

We are happy to answer for you, the following are the results of your inquiry: the soil moisture content cannot be increased due to the delay of rain, and the root system of the plant absorbs this water, so the water content of the spray is higher, and the penetration and effectiveness of the drug will be reduced. Moreover, rain absorbs saturated steam in the air, forming dew, which in turn inhibits the spread and penetration of the agent.

In addition, once there are too many wetlands, the microorganisms will absorb more of the sprayed herbicide and make it ineffective. Therefore, it is better not to spray herbicides when the land is wet. Preventive measures can be taken to control the growth of weeds by means of soil loosening, weeding, weeding and weeding to ensure the health of crop growth and achieve balanced development of crops.

Weed control is an important part of the agricultural management process, and if a weed hazard occurs, it can directly affect crop yields. In the control method, the application of herbicides is very common, with the development of technology, the types of herbicides in China are also very rich, such as closed herbicides are a more common category. Let's take a look at the key points of its use.

When is the best time to apply a blocking herbicide.

In general, in order to be effective, closed herbicides need to penetrate into the soil of the weed's germination zone and kill the weeds after they have germinated. The best time to spray pesticides is after rain or in the morning when the dew is heavier, but it is best to choose the morning or evening when the temperature is within the optimal absorption range (10-24).

In addition, when spraying, it is also necessary to pay attention to avoid spraying at noon high temperature, the noon temperature is too high, people work in the sun for a long time is very easy to heat stroke, and the temperature is high, the pesticide evaporation and diffusion is fast, the pesticide concentration in the air will be higher than usual, and the risk of pesticide poisoning is increased invisibly. It is not recommended to spray pesticides in rainy weather, and the combination of potion and rainwater will cause the secondary dilution of pesticides, resulting in the reduction of the corresponding concentration of pesticides and the deterioration of efficacy.

Closure of herbicide use.

1. Choose the right agent.

Select the appropriate herbicide according to the type of crop, growth habit, regional characteristics, and weed occurrence characteristics. For example, many herbicides in dry fields are not recommended to be applied in rice fields, and if they are applied, they are easy to produce pesticide damage, or some herbicides that can kill small seeds are not suitable for application in crop fields with small seeds.

2. The application of closed herbicides should be early.

The closed treatment should be as far as possible before the weeds are unearthed, so as to ensure a good weeding effect and avoid losing the activity of the agent because the sensitivity of the weeds is reduced after the weeds are unearthed.

3. Medication should be appropriate.

Different regions have different soil qualities, and the dosage of herbicides is different. For example, the content of soil organic matter in Northeast China is relatively high, and the dosage of herbicides should be increased appropriately during the use of closed treatment. In the crop field covered with mulching, the herbicide remains on the soil surface after evaporating in the mulch.

Therefore, the dosage should be appropriately reduced in the plot covered with mulch, and the dosage should be appropriately increased in the crop field with multiple stubbles in one season, otherwise it is easy to be adsorbed by wheat stubble and dust.

4. The spraying technology should be good.

The spraying equipment should be specially used to spray herbicides, and at the same time, it is necessary to avoid re-spraying or missing spraying, and the amount of spraying liquid is sufficient to effectively ensure the effect of sealing. In addition, some herbicides should avoid photolysis after application, so they should be covered with soil in time, and some need to be irrigated, which are all places that need attention.

At present, closed herbicides are widely used in fields, traditional Chinese medicine, vegetables and other crop fields, and the application prospect is still very good. In the process of use, farmers must also use it in accordance with the instructions for use, and do not rush to increase the concentration or dosage at will.

In order to prevent and remove herbicide residues, the herbicide safety control agent can be sprayed appropriately.

When using herbicides, avoid high temperatures, and the temperature in many places in the south has been above 35 recently, which is easy to cause pesticide damage. When taking medicine, choose to cool down in the afternoon, and prefer not to use medicine rather than cause drug harm.

Rice post-emergence herbicides, most of the herbicides to control grasses and broad-leaved weeds are mixed, and some of them have not been used, and they should be used with caution. To control broad-leaved weeds, it is generally used to control herbicidal pine, sodium dimethyltetrachloride, chlorofluorobioxyacetic acid, zooxazone, etc., and the latter three are prone to pesticide damage at high temperatures.

Some farmers like to add silicone when using herbicides to increase the efficacy of the drug, and do not use silicone, especially zooxone, adding silicone, which will seriously increase the probability of pesticide damage.

Some pesticides themselves will be harmful to rice, when using herbicides, try not to mix pesticides, if you have to mix, be sure to find out in advance whether the two can be mixed.

.Weeding time When weeding a rice field, the best weeding time is when the weeds have 3 leaves. Due to the harsh weeding time, many people are prone to miss this time.

In addition to the damage caused by weeds, weed control is one of the important measures to improve rice yield. There are many kinds of weeds, and their properties are also different, which is difficult to control. For its current control measures, in addition to some physical methods to control the entry of grass sources and inhibit their growth, they mainly rely on chemical agents to kill them, and I will share some of my experience with you below.

Water-drought rotation: The most effective weed control measure is to actively improve the rice growth environment, creating an environment that is conducive to rice growth but not conducive to weed survival. At present, the most effective method advocated is water-upland rotation, that is, planting rice and then planting other types of dryland crops, and the dryland environment is conducive to inhibiting the growth and spread of various aquatic and wet weeds.

Grass seed eradication: Seeds, fertilizers and paddy soil should be treated before rice planting to eliminate mixed or left grass seeds. Before sowing, the seeds were treated with salt slurry water, ammonium sulfate and ammonium nitrate water for seed selection or mechanical selection, with the purpose of removing weeds mixed in rice seeds; Before fertilization, the organic fertilizer should be fully decomposed to eliminate the mixed grass seeds; As soon as weeds are found in the field, they are pulled out immediately to prevent their seeds from being left in the soil after they have matured.

Then, in the later stage, remove the old grass, update the knowledge of weeds in the paddy field, in order to help rice farmers control costs, scientific farming, and increase yield and income, the weeds of paddy field live broadcast often occur: mainly barnyard grass, gold, grass and flat-footed longhorn beetle. Before the rice sowing stage, the soil must be sprayed to ensure that the chemical solution adheres completely to the soil surface and achieves the drying effect of the water storage field.

To ensure the weed effect of the paddy fields, after the field cooking is over, the day before, the water must be drained so that the leaves of the elva dhaniha are exposed to the water, or drugs are applied. It should be extended to the bottom of the shrub rice for even spraying, so that the chemical solution can spray more than 40 herbicides. However, despite the fact that rice cultivation actually has its own herbicides.

Summary. Foliar sprays are used for glyphosate and paraquat. Quinquina forest. Flupyrimethoxalin and other herbicides that are sensitive to gramineous crops have a great impact.

What "herbicides" cause rice death?

Hold on. Foliar sprays are used for glyphosate and paraquat. Quinquina forest. Flupyrimethoxalin and other herbicides that are sensitive to gramineous crops have a great impact.

Hope mine is helpful to you.

Why the whole field of rice has an effect, noticeably short.

Maybe he didn't use a lot of doses, and he didn't all die, and these short ones had an effect.