The first strategy is to broaden the range of weed control and enhance its effectiveness. Using herbicides with different modes of action and weed spectra can complement each other, allowing for better control over a wider variety of weeds. For instance, combining acetochlor with atrazine or saxein significantly expands the spectrum of weeds controlled. In rice fields, herbicide ether alone may only target certain grasses like alfalfa and calfgrass, but when mixed with dimethyl tetrachloromethane, it effectively controls broadleaf weeds such as Sancao grass and wild leeches.
The second approach is to extend the duration of weed control and reduce the number of applications. By mixing herbicides with long residual effects with those that have shorter pot life, you can achieve continuous weed suppression throughout the crop growth cycle. For example, in cotton fields, trifluralin combined with herbicidal ether can provide long-term protection against grasses. In paddy fields, using 10% rice straw-free WP before the early post-emergence stage helps control both annual and perennial broadleaf weeds and sedges. Adding 50 grams of butachlor per mu enhances the effectiveness against mites, reducing the need for multiple applications.
The third benefit of herbicide mixtures is reduced crop damage and improved safety. When herbicides are used in combination, the total dosage is usually less than half of what would be needed if used alone, which minimizes phytotoxicity. According to field tests, applying 50 grams of bendazosone per acre before Poria cocos begins to branch can control weeds like Pork Clam and Maijiagong with over 95% efficiency. Using 40 grams results in lower efficacy (46% and 65%, respectively), while a mixture of 30 grams of bendazosone and 20 grams of dimethyl tetrachlorohydrin achieves 95% control and reduces abnormal wheat spikes by 3.2% compared to using dimethyl tetrachloride alone.
The fourth advantage is cost reduction and increased economic efficiency. Combining herbicides allows for fewer applications and lower dosages, saving labor and production costs. For example, highly active herbicides can cause crop injury if misapplied, but mixing them can overcome their individual limitations. Applying a mixture during the 4-leaf stage of winter wheat or before jointing in spring wheat can achieve piglet control rates above 94%, with a 22.5% cost reduction compared to single herbicides. It also reduces deformed ears by 0.85% compared to using dimethyl tetrachloride alone.
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