In the process of agricultural planting, there is such a sentence as "three points, seven points", and the level of crop yield has a great relationship with the management of the entire growth period. For wheat, it has experienced a winter "baptism", affected by low temperatures, droughts, etc., so after the wheat returns to green, or the management during March and May, it largely determines the final yield.
During the period of wheat from March to May, unfavorable factors such as diseases and insect pests, dry and hot winds, and premature aging will affect the normal growth of wheat, so farmers will often take "one spray and three prevention" measures to prevent or control diseases and insect pests, dry and hot winds, premature aging, etc. In the actual process, some farmers will fight again, there are also farmers who fight 2-3 times, it is understood that there are more farmers who fight 2-3 times for wheat "one spray and three defense" management.
This leads to a question that farmers are more concerned about, when to play the first medicine?
If the drug is taken too early, there will be waste, and if the drug is taken too late, the best time to use is missed, and the effect is greatly reduced.
In terms of time, the wheat planting areas in the Huang-Huai-Hai region are mostly concentrated in early to mid-March. Wheat-growing areas that are relatively far south, such as Hubei, are scheduled to take place earlier from late February to early March. Wheat-growing areas that are relatively far north, such as northern Hebei and northern Shandong, may be postponed until the end of March.
In terms of temperature, when the average temperature of the day warms up to about 15 degrees and above, you can take the first medicine. If the weather is sunny continuously, it is also possible to be greater than 10 degrees. But do not be less than 10 degrees, if it is lower than 10 degrees, the wheat has not yet fully returned to green, diseases and insect pests have not yet emerged, and the prevention effect after spraying is low, which is a premature spray.
In addition to looking at the temperature, but also depends on the specific weather conditions in the local area, if there is too much spring rain, continuous rainy days, then check the weather forecast, choose 2-3 days without rain time to play the first medicine. In the event of rainy weather, it is more conducive to the occurrence of pests and diseases, so it is recommended that you mention the prevention work.
To sum up, after entering March, wheat growers should pay attention to the first time to take medicine, observe the local weather and temperature, check the growth of wheat, March 10 to 20, can go to the medicine, if the weather does not allow, or the temperature is low, appropriate delay in the time of spraying, before the end of March.
Seeing this, another problem is also what many farmers are more concerned about, that is, herbicides and "one spray three prevention" agents can be mixed together to fight?
In response to this question, the answer given by the little helper is to fight separately. According to the planting experience, the herbicide is played first, because after the Spring Festival, the wheat begins to return to green, and the weeds begin to grow, even earlier than the wheat, especially in the wheat field that did not play the herbicide years ago, there are more weeds in the field after the year, so it is necessary to spray the herbicide first.
After the herbicide is sprayed, after 3-5 days or a week, go to spray the "one spray and three prevention" agent, which is the practice of many farmers. Of course, if you don't want to space for so long, you can also go to the next day after the herbicide, and then go to the "one spray and three defenses" agent the next day. In short, it is advisable to play separately and is not recommended to mix them together.
Finally, let's talk about the problem of "one spray and three prevention" agents, what kind of pesticides should be chosen?
When playing the first time of medicine, the insect pests are mainly aphids and red spiders, aphids can choose imidacloprid, thiamethoxine, etc., and red spiders can choose avermectin.
The main diseases are striated blight, stripe rust, striated blight can choose gluconazole, phenyl ether methylcyclazole, thiafuranamide, etc., stripe rust can choose fluconazole and so on.
Nutrient-promoting agents can choose foliar fertilizers with high phosphorus and high potassium, or foliar fertilizers with full nutritional supplements, and there are also wheat-specific foliar fertilizers on the market, as well as amino acid foliar fertilizers and so on.
Nutrient regulation agents are generally based on brassinolide, especially during the rejuvenation period, wheat fields with weak wheat growth, spraying brassicalin can well promote the growth of wheat.
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"Three points, seven points", the above is the first time of wheat "one spray three defense" related content, when to fight? Can it be mixed with herbicides? What kind of agent to choose? These problems have been explained to everyone, and I believe that I have gained something after reading it.
Due to the different regions, the time of spraying is early and late, ask everyone, what is the time of the first medicine of your local wheat?