Timely chemical weeding in the spring
Spring weeding is very important for the removal of wheat fields. In addition to mastering the conventional decontamination techniques, spring weeding must pay special attention to three aspects:
1, spring chemical weeding time is tight, the task is heavy, and affected by the climate, so the spring in addition to the need to see the seams, as long as the conditions are met, the sooner the better. The first consideration is sensation. From the current point of view, the lyrics in the field are all relatively good. For a period of time in the future, as long as the average daily temperature reaches 5°C, chemical weeding in the spring can be carried out as usual.
2, before the winter chemical weeding is to choose the herbicide on the road, and in the spring chemical weeding not only to choose the herbicide on the road, but also choose a higher safety, low residual herbicide. The use of metsulfuron-methyl, chlorsulfuron-methyl, and tribenuron-methyl can not be used too late, nor can blindly overuse.
3, in addition to the spring must pay attention to the growth period of wheat. Because our province has large spans in the north and south, the types of wheat grown are different, the planting time is different, and the time for the start of jointing of wheat is relatively large, so chemical weeding cannot be done according to time. It is recommended that before the chemical weeding, go to the field and check to see what fertility period wheat has entered.
According to conventional wheat field chemical weeding, the primary concern is the condition of weeding—temperature and lyrical conditions. We must also choose herbicides on the road and grasp the time to fight drugs. For ordinary grass weeds, such as aphrodisiac, wild oats, grass, etc., you can choose to control flucarbazone, clodinafop-propargyl; for bluegrass, we recommend that you choose to include methylsulfuron-methyl Pharmaceutics, such as Sima, Kwok-ma; For Japan to see aphrodisiac, you can choose the imidoxime, priority, buckwheat, and containing methylsulfuron, containing oxazoline oxalate to control; For broad-leaved weeds For example, we recommend the use of herbicides containing dimethyltetrachlorobenzene in weeds such as cat's eyes and sowed wormwood; if it is pungent, it is recommended to use dimethyltetrachloro- and valerianone as the compound. Control; for swine fever, phopyloxine can be selected to control; weeds such as leek, you can choose to contain dimethyl tetrachlorine or containing flufenoxan such agents; for wild pheasant, you can choose chlorofluoro Pyroxaline.
Note: The compounding of pesticides should pay attention to the miscibility of herbicides. Some herbicides can be compounded and some herbicides cannot be reconstituted. For example, dimethyl tetrachlorine and herbicides for controlling grass weeds cannot be mixed and used, otherwise it is easy to produce phytotoxicity. The azole func- tion such as flufenazone and the emulsifiable herbicides against grass weeds should not be mixed as much as possible.
Application techniques: First carry out the secondary dilution, then use the amount of the foot and the amount of water. Spring weeding due to the relatively large grass age, it can increase the appropriate amount. In general, the amount of herbicide in spring can be increased by 10%-20%. For example, oxazolyoxime is required. Before 80-100 milliliters were required, 100-120 milliliters would be added after the year. This will not only ensure the weeding effect, but will not produce serious phytotoxicity.
Manage due to reasons
For the northern part of Hebei Province, if it is a dry year, it is necessary to pour green water once, but it is not appropriate to return to Qingshui, especially some weak seedlings. Because it will cause a drop in soil temperature prematurely, it will not be conducive to the growth of spring wheat. Generally, we must wait until the soil temperature returns to about 5°C before pouring. For the rice and buckwheat regions, it is important to do a good job of clearing the ditch in the spring.
Do a good job of prevention and control of pests and diseases
Diseases mainly control sheath blight. Because pre-winter sheath blight occurs more severely. Although sheath blight is a key prevention and control period during the jointing period, it should be checked early this year and checked frequently. Once the occurrence of sheath blight occurs in the field, prevention and control will begin immediately.
Insect pests should focus on the control of locusts and red spiders. In particular, in areas where the occurrence of yellow dwarfs was relatively heavy in previous years, it was necessary to pay attention to the prevention and control of locusts in the seedling stage.
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