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Using a rotary hoe is an effective method for preparing soil before the application of preemergent herbicides in dry conditions. This tool mechanically loosens the upper layer of soil, creating a fine seedbed that can enhance the effectiveness of the herbicide. By breaking up soil clumps and improving soil aeration, the rotary hoe allows for better herbicide distribution on the soil surface, which is critical for ensuring that the active ingredients can adequately prevent weed seed germination.

The physical disturbance of the soil also helps in mixing the preemergent herbicide more evenly throughout the top layer, increasing its contact with weed seeds and promoting its effectiveness. This method is particularly valuable in dry conditions where good soil coverage is essential for the preemergent herbicide to function correctly.

In contrast, manually pulling weeds does not prepare the soil for herbicide application and is labor-intensive. Applying irrigation can help activate some herbicides but is not a suitable preparation method on its own. Using herbicide granules may be practical, but without proper soil preparation, their effectiveness can be compromised.