Weed control after the first irrigation in wheat is a very important step because this is the time when both wheat and weeds start growing fast. Many farmers give the first irrigation at the CRI stage (around 20–25 days after sowing). After this irrigation, a fresh flush of weeds often appears, especially in fields with good moisture. If these weeds are not controlled early, they compete with wheat for nutrients, water, and sunlight. This reduces tillering, weakens the crop, and finally lowers yield. So farmers should plan weed control immediately after the first irrigation.
The first thing is to identify the type of weeds present. In wheat, weeds are mainly of two types: grassy weeds and broadleaf weeds. Grassy weeds look similar to wheat in early stage and are difficult to control if delayed. Broadleaf weeds have wider leaves and grow quickly in open spaces. Many fields have a “mixed weed problem,” meaning both grassy and broadleaf weeds are present. The weed control method depends on which type is dominant.
Mechanical weeding can be effective if the crop is line sown. After the first irrigation, when the soil becomes workable (not too wet and not too dry), farmers can do one hoeing or intercultivation between rows. This uproots small weeds and also loosens the soil, which improves aeration and encourages better tillering in wheat. However, in most wheat fields, row spacing is narrow, and mechanical weeding is not always easy. That is why chemical weed control is commonly used after the first irrigation.
The best time for post-emergence herbicide spray is usually when weeds are small and actively growing. After the first irrigation, wait for 5 to 7 days so the field surface dries and weeds come out clearly. Spraying on very wet soil or when standing water is present reduces herbicide performance. Most herbicides work best when weeds are in the 2–4 leaf stage. If you delay and weeds become bigger, control becomes weak and you may need higher cost or repeat measures.
For fields with only broadleaf weeds, farmers use a broadleaf herbicide. For fields with grassy weeds, a grassy weed herbicide is needed. If both types are present, a suitable combination or ready-mix product is used to control mixed weeds. The key is to choose the herbicide based on weed type, not by guess. If you are not sure, take a quick walk in the field and check which weeds are present in more number.
While spraying, correct method is as important as correct chemical. Use clean water and proper dose. Calibrate the sprayer so the right quantity is applied uniformly. Use flat-fan nozzle if available because it gives better coverage. Do not spray in strong wind because the chemical drifts and coverage becomes uneven. Spray in the morning or evening when there is low wind. Keep the field without irrigation for at least 24–48 hours after spraying so the herbicide can act properly. If irrigation is given immediately after spray, it can reduce effectiveness.
Another common mistake is mixing many products without checking compatibility. Farmers sometimes mix herbicide with urea, micronutrients, or insecticides. This is risky because it can reduce weed control or harm the crop. For best results, spray herbicide alone unless local recommendation clearly allows mixing.
Also remember that weed control is not only about killing weeds, but also preventing re-growth. If weeds are controlled early after the first irrigation, wheat canopy becomes dense and later weeds find less sunlight to grow. That is why early control gives long-term benefit.
Farmers should also maintain field borders and bunds clean because weeds from edges spread into the field. If you see weeds in patches, spot spraying can save cost.
In simple terms, weeds after first irrigation in wheat should be controlled quickly, ideally 5–10 days after irrigation when weeds are small. Identify whether weeds are grassy, broadleaf, or mixed, and then choose the right post-emergence herbicide or method. Spray on a dry surface with proper dose and uniform coverage, avoid immediate irrigation, and avoid unnecessary mixing. When this is done correctly, wheat tillering improves, crop becomes healthier, and yield increases.
