Isoproturon is a widely used herbicide in wheat fields, known for its effectiveness in controlling grass weeds and certain broadleaf weeds. Among the many registered products, 50% Isoproturon Wettable Powder has become one of the most popular options in recent years due to its efficiency and affordability.
One of the key advantages of Isoproturon is its broad spectrum of activity. It works well against common grass weeds like barnyard grass, Japanese foxtail, hard grass, and wild oats. Notably, it's especially effective against aggressive weed species that have been increasing in population over the past few years. Despite long-term use, resistance to Isoproturon has not yet been reported, making it a reliable choice for farmers.
Another benefit is its wide application window. The herbicide can be applied from sowing through the jointing stage of wheat, offering both soil treatment and foliar application options. Additionally, it has a short residual period in the soil, which makes it safe for subsequent crops. Its moderate cost also contributes to its popularity among farmers.
To achieve the best results, proper timing, dosage, and application technique are essential. The ideal time to apply Isoproturon is during the peak emergence of weeds before winter. Spraying in spring is less effective, as the weeds tend to be too large by then. A typical rate of 62.5 grams of active ingredient per acre before winter can provide excellent control. Farmers should ensure sufficient water volume—more than 30 kg per mu—to improve coverage and effectiveness.
According to the China Pesticide Network, Isoproturon is generally safe for wheat, but it may reduce the cold tolerance of young plants. If applied just before a cold snap, it can lead to "frost phytotoxicity," causing yellowing and stunted growth. To avoid this, it’s recommended to apply the herbicide before the first major cold wave. After the initial cold period, wheat plants have had time to acclimate, improving their frost resistance. Fields that weren’t treated early can be managed using the "cold tail warm head" method, ensuring both efficacy and plant safety.
Additionally, when applying Isoproturon in rice paddies, care must be taken during the coexistence period with rice, as rice is more sensitive at this stage. It should only be applied after the rice has been harvested. The field should be drained properly after application to prevent "wet phytotoxicity." These precautions help maintain both crop health and herbicidal effectiveness.
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