
Buttercup. (UAPB photo)
Weeds can outcompete more desirable species under conditions of low fertility. Most of Arkansas’s better pasture grasses and legumes do poorly in acidic soils. Phosphate and potash levels in Arkansas soils tend to be lower than optimum for many forages. Adding lime to control soil pH and fertilizing according to soil test results can give grasses and legumes a chance to outcompete the weeds after an initial round of another control method.
Herbicides kill weeds effectively while avoiding damage to desirable forages. But herbicides are not a miracle cure, and more than one application may be needed in combination with other weed control methods. Different herbicides kill different weeds, and some herbicides can damage pasture grasses and legumes if not applied correctly.
Extension publication MP44, “Recommended Chemicals for Weed and Brush Control,” contains herbicide recommendations for pasture weeds. Your county Extension agent can help you choose which herbicide is appropriate for the weeds on your farm, Fernandez said.

Bitter sneezeweed
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Source:uaex.edu