A material used to kill weeds, being either selective, killing only certain plants, or broad spectrum, killing many kinds of plants. In cotton, the material usually is characterized by (1) timing: “PPI” (prior to planting and incorporated), “pre” (prior to plant emergence from soil), and “post” (after plant emergence); or by (2) application type: “broadcast” (applied evenly over an area), “banded” (applied over a portion of the total area), or “directed” (targeted at a specific area), usually toward the base of the cotton plant.
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