After the wheat is harvested, it is the season of corn planting. If you want the corn to rise well, it is very important to do the post-emergence weeding work. After applying the corn seedlings, the herbicide needs to master the correct method, otherwise it will not achieve the effect, and may also cause The phytotoxicity, let's follow the Xiaobian to understand it.
1, spraying time
After the corn seedling herbicide spray, it takes 2 to 6 hours of absorption process. During these 2 to 6 hours, the effect of the drug is good (that is, whether the herbicidal effect is ideal) is closely related to temperature and air humidity.
Spraying in high temperature, dry morning, noon or afternoon, due to strong light, the liquid evaporates quickly, the amount of herbicide entering the weed body is obviously insufficient, which seriously affects the herbicidal effect, and the corn seedling is also prone to phytotoxicity.
The optimal spraying time of the herbicide after corn seedlings is after 6 o'clock in the evening, because the temperature is lower after application, the humidity is larger, the liquid stays on the weed leaves longer, and the weeds can fully absorb. The herbicide ingredient ensures the herbicidal effect, and the evening use can also significantly improve the safety of the corn seedlings, and is less prone to phytotoxicity.
2, spraying method
The amount of medicine used is 15 to 30 kilograms of water. See the grass spray, spray carefully, no grass will go, save the medicine and save time.
3, look at the grass size
When spraying herbicides on corn seedlings, many farmers think that the smaller the weeds, the smaller the resistance, the easier it is to be killed. Actually, it is not the case. Because the grass is too small and there is no medicine area, the weeding effect is not ideal. The best grass age is 2 leaves 1 heart to 4 leaves 1 heart period. At this time, the weeds have a certain area of ​​medicine, the resistance is not large, and the weeding effect is obvious.
4, see the size of the seedlings
The best spraying time for corn post-emergence herbicides is 2 to 5 leaf stage of corn. At this time, the resistance of corn is high and it is not easy to cause phytotoxicity. 5 leaves before the whole field spray, after 6 leaves spray to lower the nozzle against the corn tree spray, to prevent the drug solution caused by the drug (mainly without the safety agent of nicosulfuron, if it is safe nicotinic acid The sulfonate boutique can also be sprayed in the whole field).
5, corn varieties
At present, most of the corn post-emergence herbicides are nicosulfuron-methyl. Some corn varieties are sensitive to this ingredient and are prone to phytotoxicity. Therefore, corn fields such as sweet corn, waxy corn and Denghai series cannot be sprayed. Preventing phytotoxicity. For new corn varieties, please test and promote.
6, pesticide mixed
It is strictly forbidden to spray organophosphorus pesticides within 7 days before and after spraying of herbicides, otherwise it is prone to phytotoxicity. However, it can be mixed with pyrethroids and carbamate insecticides. When spraying, pay attention to avoiding happy leaves and anti-drug solution.
This year, some corn fields have serious occurrences of Swedish flies and thrips. These two small pests can be sprayed with imidacloprid or acetamiprid, but they should not be sprayed with post-emergence herbicides. Although imidacloprid or acetamiprid is not an organophosphorus, it is necessary to spray the heart leaves because of the control of two small pests. If mixed with the heart leaf, it is easy to cause phytotoxicity. It can be sprayed separately: the herbicide is sprayed on the front side, followed by imidacloprid. Or acetamiprid squirting heart leaves.
7, weeds themselves resistance
In recent years, the resistance of weeds has been continuously strengthened. In order to prevent excessive evaporation of water in the body, weeds grow not so watery and thick, but grow gray and short, and the actual grass age is not small (so-called " Little old man").
Most of these weeds are covered with white small fluff to reduce the evaporation of water. When the pesticide is sprayed, the liquid is topped on the surface of the weed stems and leaves, and the weeds themselves absorb little, which naturally affects the efficacy of the drug. Therefore, no matter what kind of medicine is applied during high temperature and drought, the amount of liquid medicine to be sprayed should be increased to not affect the exertion of the drug effect.
More pesticide knowledge, please pay attention to China Pesticide Network
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General Safety Information:
1. Check if the plug cord was in good condition, and if there is stand before plug into the electrical outlet ; Check if the used glue gun has glue flow through back of the tunnel;
2. wait 5-10 minutes to allow glue to soften, stand up the glue gun on the table when not in use;
3. Touch nozzle to any clean, dry surface you wish to bond, to avoid any impurity stop the nozzle;
4. If the glue could not flow from the nozzle when the glue gun start to work, check if the glue gun are heating;
If glue
gun can not be heated, there are following reasons:
1
Plug cord into electrical outlet not
properly;
2
Glue gun has been destroyed owing to
inner cord short circuit;
If glue gun can be heated, there are following reasons: Nozzle has been stopped by any impurity, ask careerman to manage it.
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10. Only used for melting glue stick, no other usage;
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Important Caution:
1． Before use the glue gun, check if the plug cord into electrical outlet properly;
2． When glue gun in first use, the heating element will have small smoke, it is normal situation, but the smoke will disappeared after 10 minutes;
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7． Not applicable for bonding heavy objects or objects needed strong adhesive
8． The quality of glue stick will directly influence the glue gun function and sticking objects quality;
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10． This tools must b e placed in its position when not in use. And storage before the tools complete cooled.
11． Be careful when using any other electrical appliance with flammable material.
12． Not applicable for a long time in the same place.
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14． Note that heat may be the line of sigh, combustible materials.
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16． This appliance is not intended for use by persons(including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
17. Children should be supervised to ensure that they do not play with the appliance.
Using methods
1. Glue gun using voltage is 110-220V AC,50/60Hz;
2. Tip gun forward on stand and place a piece of cardboard under the nozzle
3. Use 7-8mm
(mini trigger glue gun), 11-12(big trigger glue gun), insert glue sticks
through
tunnel at back of gun
4. After power, wait for 5-10 minutes to allow glue to soften
After glue softens, squeeze trigger to feed glue through glue barrel. Excessive force will damage glue gun. Put down nozzle after work, disconnect the power plug
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