The application of post-emergence herbicides on corn has a great influence on the post-crop crops. If the post-emergence herbicides are used improperly, it is easy to affect the normal growth of post-corn crops. What are the aspects of using herbicides after using corn? ?
First, when applying corn in the field, do: "To distinguish the varieties, do not blindly use drugs"
Since most of the current corn seedling herbicides are nicosulfuron-methyl, some corn varieties are sensitive to this ingredient and are susceptible to phytotoxicity.
Some products indicate that it is forbidden to use on corn inbred lines, sweet corn, waxy corn and other varieties. Therefore, it is said that the post-emergence herbicides are not used in any variety. The product descriptions should be read in detail. Use, improper use, do not use, control corn seedlings to produce phytotoxicity.
Second, do the medicine: "Secondary dilution, do not mix water, medicine directly" especially powder type medicament
The second dilution is like the chef making noodle porridge. Under the premise of selecting a certain amount of water, first mix a small amount of water with the medicine, then add the remaining water, stir evenly and spray. Avoid the uneven mixing of water and medicine. The weeds in this place where the medicine is sprayed are dead. The weeding effect of the weeds that continue to grow in the place where the water is sprayed.
Third, when spraying, do "do not spray high spray"
The term "low and high" as used herein refers to the low and high temperature. That is to say, before 9:00 am in the middle of the day, the spray is taken after 4 pm. Do not spray in the morning, noon or afternoon when the temperature is high and the weather is dry. The amount of herbicide entering the weed body is limited, the absorption is insufficient, and the herbicidal effect is affected. At the same time, the high temperature spraying corn seedling is also prone to phytotoxicity.
Fourth, do the weeding: "To spray small, do not spray old"
Grab the weeds and leaves one heart to four leaves and one heart. Weeds have a certain area of ​​drug application and a small period of resistance to spraying. Don't wait until the weeds grow to a height of 10 cm or more, and when the eyes are green, they are sprayed.
In the high temperature and dry years, the weeds are short, but due to the long growing time, the roots are developed, forming a "small old grass" with pale gray color. Should increase the amount of liquid sprayed, use no less than 40 kg of liquid per acre, spray the whole plant with weeds, do not hesitate to take the medicine, otherwise it will not achieve the effect of removing weeds.
5. When weeding and controlling insects, do: "To be mixed with pyrethroid pesticides , do not mix with organophosphorus pesticides."
When there is pest in the seedling stage of the corn field, in order to save labor and time, when spraying the post-emergence herbicide, weeding and pest control can be carried out simultaneously. However, the mixed pesticides should be selected from pyrethroids and carbamate insecticides. When spraying, care should be taken to avoid the leaves and prevent the liquid.
Sixth, the corn seedlings after the five leaves to apply: "To fix the spray, do not spray all the fields"
The 2~5 leaf stage of corn is the best spraying time for post-emergence weeding. If the best period is missed and the necessary weeding is necessary, it should be sprayed with the ridge and can not be sprayed all over the field to avoid causing phytotoxicity. Otherwise, the light heart will cause the corn heart to turn yellow, and the heavy ones will turn white and the whole plant will stop growing.
More pesticide knowledge, please pay attention to China Pesticide Network
Introduction of diamond saw blade
Diamond saw blade is a kind of cutting tool, which is widely used in the processing of hard and brittle materials such as stone and ceramics. Diamond saw blade is mainly composed of two parts; the base body and the Cutter Head. It is the part that cuts during use. The cutter head will be continuously consumed during use, but the substrate will not. The reason why the cutter head can cut is because it contains diamond, which is currently the hardest substance. , it frictionally cuts the processed object in the cutter head. The diamond particles are wrapped in metal inside the cutter head.
Manufacturing Process Classification
1. Sintered diamond saw blade: It is divided into two types: cold press sintering and hot press sintering, which are formed by pressing and sintering.
2. Welding diamond saw blades: divided into two types: high-frequency welding and laser welding. High-frequency welding welds the cutter head and the substrate together through high-temperature melting media, and laser welding uses high-temperature laser beams to melt the contact edge of the cutter head and the substrate to form metallurgy combine
3. Electroplated diamond saw blade: the blade powder is attached to the substrate by electroplating.
Appearance classification:
1.Continuous edge saw blade: continuous sawtooth diamond saw blade, generally made by sintering method, commonly used bronze binder
2. Segment head type saw blade: the saw teeth are broken, the cutting speed is fast, suitable for both dry and wet cutting methods
3. Turbine-type saw blade: Combining the advantages of 1 and 2 above, the saw teeth continuously present a turbine-like uniform convexity, which improves the cutting speed and increases the service life.
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