After using corn herbicides , it is necessary not only to master the correct spraying method, but also to grasp the correct spraying time. What aspects should be paid attention to when using the herbicide after using corn seedlings? Xiaobian summarized the following seven points based on past experience. Let's take a look at it.
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, which affects the herbicidal effect; at the same time, when 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 very little, which naturally affects the exertion of the drug effect. Therefore, no matter what medicine is applied during high temperature and drought, it should be added. The amount of liquid sprayed by the large spray does not affect the exertion of the drug effect. Please do not cherish the water when applying pesticides to farmers.
More pesticide knowledge, please pay attention to China Pesticide Network
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