When is the most suitable time to spray herbicide on wheat?
AbstractFor weeding wheat, generally choose the period after greening (regrowth) and before jointing, that is, late February to mid-March. Before spraying, first check the local weather forecast, and choose clear and good weather with no rain, snow, or strong wind for spraying, when the daily average temperature is stable at 6°C-10°C, spray at 10 a.m. or 4 p.m., that is, after the morning dew has dried or before dew forms at night.
1. Wheat weeding time
Weeding needs to be done after greening (regrowth) and before jointing, that is, late February to mid-March. Before spraying, first check the local weather forecast, and choose clear and good weather with no rain, snow, or strong wind for spraying, when the daily average temperature is stable at 6°C-10°C, spray at 10 a.m. or 4 p.m., that is, after the morning dew has dried or before dew forms at night.
2. How to choose a herbicide
1. The choice of herbicide depends on the main weed species in the field. Generally, for wheat fields dominated by broadleaf weeds such as flixweed (Descurainia sophia), shepherd's purse (Capsella bursa-pastoris), speedwell (Veronica), cleavers (Galium aparine), common chickweed (Stellaria media), and sun spurge (Euphorbia helioscopia), you may choose tribenuron-methyl + fluroxypyr, 20% florasulam·fluroxypyr, 7.5% florasulam·carfentrazone-ethyl and other agents, or 5.8% flumetsulam·florasulam.
2. For wheat fields dominated by grass weeds such as wild oat and shortawn foxtail (Alopecurus aequalis), you may choose cloquintocet-mexyl·clodinafop-propargyl, clodinafop acid, fenoxaprop-P-ethyl and other agents; for wheat fields dominated by jointed goatgrass (Aegilops tauschii) and Phleum paniculatum, you may choose mesosulfuron-methyl·iodosulfuron-methyl-sodium, mesosulfuron-methyl and other agents.
3. For wheat fields where grass weeds and broadleaf weeds are mixed, you may choose herbicides such as flucarbazone-sodium, sulfosulfuron, or tribenuron-methyl, fluroxypyr, fenoxaprop-P-ethyl, which need to be mixed in a certain proportion for use. At the same time, for wheat fields where the monocot weeds are mainly bromegrass (Bromus), you may choose sulfosulfuron + a dedicated adjuvant or flucarbazone-sodium.
4. For wheat fields dominated by jointed goatgrass (Aegilops tauschii), you may choose mesosulfuron-methyl + a dedicated adjuvant; for wheat fields dominated by wild oat, you may choose clodinafop-propargyl or fenoxaprop-P-ethyl; for wheat fields dominated by shortawn foxtail (Alopecurus aequalis), you may choose clodinafop-propargyl or fenoxaprop-P-ethyl, or sulfosulfuron + a dedicated adjuvant.
5. The water volume per mu is 20-30kg, or mix according to the dilution concentration recommended in the product instructions. No matter which herbicide product you choose, it must be used strictly according to the recommended dosage and method on the product label. Do not arbitrarily increase or decrease the dosage, and it should not be mixed with products such as organophosphorus insecticides.
6. To avoid phytotoxicity or affecting the weeding effect, and possibly also harming the growth of the following crop, do not use long-residual herbicides such as chlorsulfuron and metsulfuron-methyl. At the same time, spraying herbicide should be done at least 7 days after topdressing the wheat with greening (regrowth) fertilizer. If the wheat encounters drought or poor soil moisture.
7. You need to water the greening (regrowth) water first, and then spray. There must be no standing water in the field. Before spraying the herbicide, the agent needs to be diluted twice and mixed evenly. The sprayer needs to be a electric sprayer with good performance. Spraying should be fine and even, and do not spray twice or miss spots.