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Weed Control Options for Pasture

Good weed control takes dedication and utilization of several methods, especially with certain weeds. Specific options include: 1) grazing management, 2) mechanical control, and 3) chemical control.

1. Grazing management

Proper grazing management has proven to be a very useful weed control mechanism. Good fertility goes hand in hand with good weed control. Controlled grazing allows beneficial plants to become strong, productive plants and out-compete the weeds. Rotational grazing helps in this process because it gives beneficial plants the opportunity to rest after grazing, and then grow undisturbed before being grazed again. High stocking rates in small paddocks can also be used to “force” animals to consume forage that might normally be considered a “weed”.

Soil pH management is critical in the Northeast where are soils are naturally acidic. Regular soil testing should be considered. If soil pH levels are below 6.0, conditions favor weed growth as opposed to desirable grasses and legumes. A soil program that includes lime applications when indicated is essential. For most applications, soil tests will indicate the use of high Magnesium limestone or Dolomitic limestone to improve the magnesium status in the soil and the resulting forage. This is important for both plant health and for the prevention of metabolic diseases in livestock such as grass tetany.

Grazing management alone, however, will not normally correct serious pre-existing weed problems without causing losses in animal performance. Plants such as thistles, brush, and poisonous plants may continue to be a problem even after you have intensified your system, since they are seldom eaten even at high stocking rates.

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Last Modified: 08/05/03
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