First, spraying time
Since the corn seedling herbicide requires 2-6 hours of absorption after spraying, in the 2-6 hours, the effect of the drug is good (that is, the herbicidal effect is ideal) and the temperature and air humidity are closely related.
Spraying in the morning, noon or afternoon when the temperature is high and the weather is dry, because the temperature is high, the light is strong, the liquid evaporates quickly, and after a spraying, the liquid will evaporate, so that the amount of the herbicide entering the weed body is limited, and the absorption is limited. The amount is obviously insufficient, thus affecting the herbicidal effect;
At the same time, spraying at high temperature and drought, corn seedlings are also prone to phytotoxicity. The best spraying time is after 6 o'clock in the evening, because the spraying at this time, the temperature is lower after application, the humidity is larger, the liquid stays on the weed leaves for a longer period of time, and the weed can fully absorb the herbicide. The ingredients ensure the herbicidal effect, and the evening medication can also significantly improve the safety of the corn seedlings, and it is not easy to cause phytotoxicity.
Second, spraying method
The amount of medicine used is 15-30 kg for water. See the grass spray, spray carefully, no grass to go, save time and effect.
Third, look at the grass size
When spraying herbicides after spraying corn seedlings, many farmers have a misunderstanding. The smaller the weeds, the smaller the resistance, and the easier the grass is to kill.
Actually, it is not the case. Because the grass is too small, there is no medicine area, and 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 weed resistance is not large, and the weeding effect is remarkable.
Fourth, the size of corn seedlings
The best spraying time for corn post-emergence herbicides is corn 2-5 leaf stage. At this time, the corn is highly resistant and is not susceptible to phytotoxicity.
5 leaves can be sprayed in the whole field before the leaves, spray after 6 leaves, the nozzle should be lowered, and the corn seed spray should be sprayed to prevent the poisoning of the liquid (mainly the nicosulfuron without safety agent, if it is safe smoke) The sulfinsulfuron boutique can also be sprayed in the whole field.).
V. Corn varieties
Since most of the corn seedling herbicides are currently 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 to prevent drugs. Harmful. For new corn varieties, please test and promote.
Sixth, the problem of pesticide mixing
It is strictly forbidden to spray organic phosphorus insecticides 7 days before and after spraying the 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. The 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 organic. Phosphorus, because it is necessary to spray the heart leaf to prevent and control two small pests, if it is 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 the spray of the heart leaf with imidacloprid or acetamiprid.
Seven, the resistance of weed itself
In recent years, the weed resistance of weeds has been 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 spraying pesticides in this way, the liquid is topped on the surface of the weed stems and leaves, and the weeds themselves absorb little, which naturally affects the exertion 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, so as not to affect the exertion of the drug effect. Please don't cherish the water when applying medicine to farmers.
Black metal industry standard of the People's Republic of China: Ultra High Power Graphite Electrode (YB/T 4090-2000) "regulation of the ultra High Power Graphite Electrode shape, size and allow deviation, technical requirements, test methods, inspection rule, packing, marking, storage, transportation and quality certificate. It is applicable to high - power Graphite Electrode, which is made of high quality needle coke as the main raw material, which is made of molding, roasting, impregnating, graphitization and machining.
Graphite is very common in nature, and graphene is the intensity of the highest substance known to mankind, but scientists could still take several years or even decades, to find a way to graphite into a large high quality graphene "thin film" method, thus they can be used to manufacture all kinds of useful material for mankind. According to scientists, graphene in addition to very strong, but also has a series of unique features, graphene or conductive performance of the best known materials, which makes it also has great potential applications in the field of microelectronics. The researchers even see graphene as a substitute for silicon that can be used to produce future supercomputers.
superiority
1: the increasing complexity of the geometry of the mould and the diversification of the product application result in the higher and higher demand for the discharge accuracy of the spark machine. The advantage of graphite electrode is that it is easy to process, high removal rate and low graphite loss. Therefore, some of the group spark machine customers have abandoned copper electrode instead of graphite electrode. In addition, some special shaped electrode can't made of copper, but easier to forming, graphite and copper electrode is heavier, not suitable for processing large electrode, these factors have caused part of the group of the graphite electrode spark machine customer applications.
2. Graphite electrode is easier to process, and the machining speed is obviously faster than that of copper electrode. For example, graphite is processed by milling process, and its processing speed is 2~3 times faster than that of other metals, and no additional manual processing is required, while the copper electrode needs to be worn by hand. Similarly, if you use a high speed graphite processing center to make the electrode, it will be faster, more efficient, and will not produce dust problems. In these processes, selecting the right tools and graphite can reduce the abrasion loss of the cutter and the breakage of the copper gong. If the concrete is the milling time of graphite electrode copper electrode and graphite electrode, graphite 67% faster than copper electrode, in the general case of electro discharge machining, the adoption of graphite electrode machining 58% faster than using copper electrode. In this way, the processing time is greatly reduced and the manufacturing costs are reduced.
3: the graphite electrode is different from the traditional copper electrode design. Many mold factory in copper electrode roughing and finishing usually have different requirements, and graphite electrode is used almost the same amount of reserve, this reduces the CAD/CAM and the frequency of machine, sheet is for this reason, to a large extent is enough to improve the precision of the mold cavity.
Of course, the first thing that should be clear is how to use graphite materials and other related factors after the copper electrode is transferred to graphite electrode. Today, some group spark machine customers use graphite for electrode discharge machining, which is exempt from the process of mold cavity polishing and chemical polishing, but still achieve the desired surface finish. If the process of time and polishing is not increased, it is impossible for the copper electrode to produce such an artifact. In addition, the graphite is divided into different levels, and in particular the application of using the appropriate level of graphite and spark discharge parameters to achieve the ideal processing effect, if in the use of graphite electrode spark machine operators use the same as the copper electrode parameters, then the result is certainly disappointing. If the material of the electrode is strictly controlled, the graphite electrode can be used in the non-loss condition (less than 1%), but the copper electrode is not used.
Ultra High Power Graphite Electrode
Ultra High Power Graphite Electrode,Conductive Graphite,Mesh Graphite Electrode,Special Graphite Electrodes
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com