After the Spring Festival, temperatures begin to rise and the spring plowing season starts. In many regions, wheat will enter its rejuvenation phase, typically between late February and early March. If weeds were not controlled before winter, it's crucial to take advantage of this optimal period for weed management in the wheat field.
When applying herbicides, it's essential to consider the right weather conditions. Most herbicides are temperature-sensitive, so they should not be used when temperatures drop below 6°C. The best time is between 10:00 am and 3:00 pm, ensuring that the temperature doesn't fall below this range before or after application.
For aerial spraying using plant protection drones, it's important to avoid windy conditions. Wind can cause uneven distribution of the herbicide mist, leading to over-application in some areas and under-application in others. Additionally, wind can cause drift, potentially damaging nearby sensitive crops. This is especially true for ultra-low-volume sprays from drones, which are more prone to drifting. Therefore, it’s advisable to avoid spraying on windy days.
If the soil is dry during herbicide application, increasing the water volume is recommended. However, if the soil is already moist, it may reduce the effectiveness of the herbicide.
Another key point is to avoid applying herbicides when the wheat is already sick. Recent years have seen an increase in diseases such as wheat sheath blight, root rot, and other soil-borne issues. Before spraying, make sure your wheat plants are healthy. Applying herbicides to diseased wheat can worsen the situation.
It's also important to dilute the herbicide properly. Some users try to save money by directly pouring large quantities into the main tank without proper mixing. This method is not only unscientific but can also lead to ineffective results. Most herbicides come with additives that help with penetration and effectiveness. These additives are often thicker and may settle at the bottom if not properly mixed.
This can result in two problems: first, some herbicides might remain undissolved at the bottom of the tank, causing waste. Second, the concentration of the herbicide might be too low initially and too high later, leading to potential phytotoxicity. To avoid this, always use the second dilution method when preparing the solution. Make sure to stir thoroughly and transfer the mixture to the spray tank to ensure even distribution.
Avoiding overdose is another critical factor. When using aerial spraying, don’t apply too much in thick patches or try to stretch the remaining herbicide by reducing the dose. Over-application can lead to damage, even though herbicides are generally safe at normal concentrations. Excess amounts can overwhelm the wheat and cause harm.
Lastly, pay attention to the yellowing of wheat seedlings after herbicide application. It’s common for the tips of the leaves to turn slightly yellow temporarily. This is a normal reaction and usually resolves on its own as the wheat regains its green color. This phenomenon does not reduce yield and may even help promote better grain development by preventing excessive vegetative growth. There's no need to worry too much about this.
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