With the high demand for alfalfa and nearly non-existent supply, a weed control program incorporating grazing animals in early spring can benefit both the two-legged and four-legged parties involved. This organic version to weed management can be used to minimize the spread of certain weeds and to control large infestations. It’s a great option for cleaning up weeds on field borders or corners on overwintering bermuda and alfalfa crops.
Livestock grazing can be an effective alternative to herbicide use and can be utilized when weeds are located in areas where other control methods are impractical. The ability to fence problem areas and apply grazing pressure at early stages of weed growth is often the key to weed control. The length of grazing, stocking rates and field rotation are also important.
Cattle, sheep and goats are the most common animals used for grazing pasture weeds, with each having their pros and cons. It’s important to not only identify and target your problem weed, but match it to the correct grazer since some plants are less palatable to certain livestock.
Cattle prefer grasses and tend to avoid forbs and shrubs. Their larger hooves not only compact a larger surface area of soil, which may be wet due to recent irrigations, they can also cause more damage to young, tender, emerging shoots.
Goats can control a large number of spiny and prickly weed species generally untouched by sheep and cattle. Goats have also been used successfully on brush control.
Grazing by sheep is probably the most popular method of biological weed control. Sheep prefer broadleaf plants (forbs) and weeds over grasses and shrubs. Being physically smaller, they can be transported easily and overall offer the most efficient choice for weed control due to their ability to adapt easily to a variety of weed species, including poisonous plants.
Although grazing in itself does not necessarily kill the plants, it will prevent seed production and may lead to a depletion of root reserves and plant vigor, leaving more soil and space reserves for agricultural plants. As with most management decisions, the costs and benefits of each must be addressed and analyzed. In this case, the farmer can get a head start on the blooming weeds that compete with his agricultural crop, and the livestock owner can get some inexpensive feed, a benefit to all!
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