It takes three times to plant corn, what time is it?

After the emergence of weeds accompanied, it is recommended to pre-seedling blocking agent A, B grass, isopropyl grass and other agents, after planting, evenly spray the surface, to prevent, if there are weeds in the field, can be used for the closure of the solution, add contact killing herbicide, glufosinate ammonium or glyphosate, kill the existing weeds. After the corn is sown and before the seedlings emerge, we can apply a pre-emergence herbicide, which is what we call a blocking drug. When playing closed, it is necessary to grasp the time, weather and dosage to avoid drug damage.

<> pesticides have two kinds of contact killing type and conduction type, contact killing pesticides have a short aging time, generally only about seven to ten days, and conductive pesticides can reach 20 days to one month, and it is a wise choice to choose conductive pesticides to kill insects. In order to reduce the number of corn spraying, when planting corn, it is necessary to choose a coated seed, which has a variety of seed dressing, and has a good control effect on pests and diseases.

If insect pests occur in the seedling stage of corn, cypermethrin can be used to spray insecticide, and in the middle stage of corn, two pesticides can be sprayed with insecticidal double and enemy killing, and the insecticidal effect is also good, and the resistance of pests can also be reduced; When the corn has a flare mouth, it is sprayed with cypermethrin again, and the insect infestation is basically gone. The whole corn growth period can only be weeded once, otherwise it will be beaten more, which will have an impact on the next crop. If the corn is more than one meter high, it will be pested again to ensure that the corn cob is free of pests.

In this way, there is almost no need to spray the corn when it comes to harvesting it.

Corn growth process should also be fertilized in time, corn seedlings after timely cultivation, ridge and stubble, promote root rooting, among them, the key measures to prevent fall is to increase potassium fertilizer, seedling water control and prevent over-density. Corn roots are deep in order to grow strong and resistant to lodging, and the soil should be deeply ploughed once after 2-3 years. Subsoiling soil 35cm, nitrogen fertilizer is applied in stages, and organic fertilizer is added.

Agricultural production has never been rigid, and it is not necessary to do something at any time, but to judge it according to the real situation in the field.

The first time is after the emergence of seedlings, the second time is two months after planting, that is, when there is no panicle, and the third time is when it is about to mature and needs to be sprayed.

Once when you are very small, the second time when you are knee-high, and the third time when you go to the waist, these three sprays are the best, and there is no harm to the corn.

They are that the first spray is needed when the corn is planted, the second time is about three days between the first spray, and the last time is after the seedlings emerge.

Generally, in autumn, spray and weed. Because there are a lot of bugs and weeds in autumn, weeding at this time is conducive to the healthy growth of corn.

Generally, herbicides are applied within 7 days after corn sowing, if the corn sprouts, do not spray again, be sure to pay attention to the dosage, the amount of pesticides is too large and easy to cause pesticide damage.

If you plant corn, you can use weeding pesticides when the corn grows knee-high, and when you hit the weeding pesticides, you can lower them and don't hit the corn.

It should be that corn has been planted for a period of time, and it will be convenient for everyone to use herbicides at this time, and the yield of corn will be very high.

When the corn germinates, because the corn is in urgent need of nutrients at this time, it must be weeded at this time, otherwise the grass will absorb the nutrients of the corn.

Generally, herbicides should be applied when the corn has just sprouted, because it can easily cause the corn seeds to be eaten by insects.

When the corn is relatively tall, because it is not easy to kill the corn by beating herbs at this time.

It is best to start spraying a month after the plant is planted. It will be evenly sprayed on the leaves of the plant, and it should not be watered more during the medication, otherwise there will be no effect.

The first time it is better to apply the medicine at the third to fifth leaf stage of corn and the second to fourth leaf stage of weeds; The second pass was applied 7 days after the herbicide; The third time is beaten at the eight-leaf stage of corn.

I think the three to five leaf stage after the emergence of corn is the safest and most effective time for weeding.

About 15 days after the corn is planted, the corn can be herbicide-applied after it has grown 3 to 5 leaves.

The best spraying time is after six o'clock in the evening, because at this time spraying, the temperature is lower after application, the humidity is larger, the liquid medicine stays on the weed leaf surface for a longer time, the weeds can fully absorb the herbicide components, ensure the weeding effect, and the evening medication can also significantly improve the safety of corn seedlings, and it is not easy to cause pesticide damage.

Summary. It takes three times to plant corn, what time is it? The answer is as follows, please refer to it: The first medicine is generally better at the 3-5 leaf stage of corn and the 2-4 leaf stage of weeds; The second time the herbicide is applied about 7 days after the herbicide, which can cure insects and prevent diseases; The third time is to shoot at the 8-leaf stage of corn, which is the best period to control the prosperity.

It takes three times to plant corn, what time is it?

Planting corn requires three injections, what is the late sales of the time Qing Yuma? The answer is as follows, please refer to it: The first medicine is generally better at the 3-5 leaf stage of corn and the 2-4 leaf stage of weeds; The second time the herbicide is applied about 7 days after the herbicide, which can cure insects and prevent diseases; The third time is to shoot at the 8-leaf stage of corn, which is the best period to control the prosperity.

Corn needs to be sprayed several times, and in the process of planting corn, it needs to be sprayed 3 times. 1. The first time (1) The first time to use the herbicide, the grass and grass must be sprayed in a directional way, and the use of the agent must avoid the heart leaf stage of corn and the high temperature time at noon, so as to reduce the damage of the drug. (2) At the same time of weeding, it is also necessary to prevent and control rice fly and thrips to prevent the occurrence of rough shrinkage disease.

2, the second (1) the second time is mainly to prevent insects, prevent diseases, prevent drought and flood, we must pay attention to the prevention and control of corn armyworm and borer, most of the insects on the corn have a certain resistance to the agent. (2) The agent must choose a good performance of the pesticide pants, such as chlorfenapyr, which can be both prevented and controlled, and the validity period is about 20 days. 3, the third (1) the third medication is mainly to control the growth and lodging prevention, in the control of plant growth, can be pesticides, fungicides and functional foliar fertilizer combined, so that can play a role in disease prevention, insecticide, and yield increase.

2) If conditions permit, pollinator can be sprayed at the 10-leaf stage of maize, which can play an important role in the problems of poor pollination, lack of grain and incomplete grains caused by high temperature and heat damage.

1. The first time is generally better to play at the 3-5 leaf stage of corn and the 2-4 leaf stage of weeds; The second time the herbicide is applied about 7 days after the herbicide, which can cure insects and prevent diseases; The third time is to shoot at the 8-leaf stage of corn, which is the best period to control the prosperity. 2. When spraying, we must pay attention to the concentration of the agent, and if the pesticide damage occurs, it must be treated. For plots where the damage is not very severe, it can be alleviated by spraying foliar fertilizer.

The root growth of maize in the plot where pesticide damage occurs will be affected, resulting in the reduction of the ability to absorb water and nutrients, and the spraying of foliar fertilizer can absorb water and nutrients through the leaves, alleviate the pesticide damage, and promote the growth of maize. 3. If the pesticide damage is more serious and the corn has dried up slightly, the plot with irrigation conditions can be alleviated by watering the field. If the corn in the field is not relieved after watering, it can only be replanted with other crops.

I wish you a happy life and a happy day