What is the best time for spring weed control in wheat?
Wheat is one of the main food crops in our country, and its planting area in our country 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 to have sufficient nutrients for growth. So when should weeds be controlled in spring for wheat? Below, the editor brings you the best time for spring weed control in wheat. Let's take a look!
1. Weed control time
Generally, 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 be maintained above 10 degrees, and within the 3 days before application, the temperature should preferably not drop. However, the main factor still depends on the growth condition of the wheat. Because during weed control, the 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 covers 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 amount of herbicide and water used will also be very large, and the cost of weed control rises. This not only requires a large amount of labor but also consumes a large amount of time, and it is difficult to control them thoroughly. 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.
In spring, the leaf hairs and waxy layers of weeds are also very developed, and some weeds have already produced flower buds. Most weeds have relatively strong growth ability and relatively high drug resistance. In addition, in many areas, spring 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 wheat herbicides 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 the jointing stage of wheat. After the jointing stage, the pesticide must not be used to prevent phytotoxicity. Before using the pesticide, pay attention to the weather. If there is a sharp temperature drop about 3 days before application, then the pesticide must also not be used. At the same time, pay attention to controlling the dosage well and do not change it at will. If it is a new herbicide variety, then it also must not be used at will. 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!