When is the best time for spring weed control in wheat?
Wheat is one of the main grain crops in China, and its planting area in China is very large. When growing wheat in spring, weed control work needs to be done well. Only by doing a good job in weed control can wheat be guaranteed sufficient nutrients for growth. So when should weeds be controlled in wheat in spring? Below, the editor brings you the best time for spring weed control in wheat. Let's take a look!
1. Weed control time
In general, the weed control time for spring wheat should be within the period after spring wheat enters the greening stage and before the jointing stage. The lowest temperature should remain above 10 degrees, and within 3 days before application, the temperature should preferably not drop. However, it mainly depends on the growth condition of the wheat. Because during weed control, wheat is in the greening stage, so its growth rate is relatively fast. Therefore, when controlling weeds in spring, if it is during the greening stage, then it is best to treat promptly before the wheat shades the weeds.
2. Difficulties in weed control
In spring, weeds also grow relatively fast, their number is very large, and their root systems are also very developed. Therefore, the dosage of herbicide and the amount of water used will also be very large, increasing the cost of weed control. It not only requires a large amount of labor but also consumes a large amount of time, and it is difficult to achieve thorough control. In addition, the growth rate of wheat accelerates during the greening stage, and wheat leaves easily shade the weeds, making it difficult for weed control to act directly on the weeds and making it impossible to guarantee efficacy.
The leaf hairs and waxy layers of spring weeds are also very developed, and some weeds have already developed flower buds. Most weeds have relatively strong growth ability and relatively high resistance. Moreover, in many areas in spring, the weather is mainly dry with little rain. Late spring cold spells are prone to occur, so the requirements for herbicides and application techniques are also relatively high. Finally, when applying herbicides to wheat in spring, compared with before winter, the safe interval is relatively short, and phytotoxicity is likely to occur, so herbicides with a short residual period need to be selected.
3. Precautions
When spraying herbicides, it must be done during the greening stage to jointing stage of wheat. After the jointing stage, pesticides must not be used to prevent phytotoxicity. Before using pesticides, pay attention to the weather. If there is a sharp temperature drop about 3 days before application, then pesticides must not be used either. At the same time, pay attention to controlling the dosage and do not change it at will. If it is a new herbicide variety, then it must not be used at will either. When spraying the pesticide, spray evenly. Finally, reasonably select the corresponding herbicide type according to the number of weeds in the field to ensure efficacy.
The above is a brief introduction to the best time for spring weed control in wheat. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!