Early methods of weed control included mowing, flooding, cultivating, smothering, burning, and crop rotation. Though these methods are still important, other means are perhaps more typical today, particularly the use of herbicide (plant-killing) chemicals. Another technique is to introduce insects that attack only the unwanted plant and destroy it while leaving the crop plants unharmed.
As a consequence, the design and operation of such equipment requires increased investment in research and development to enhance their operational and performance characteristics (see also, Human and Animal Powered Machinery).

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Early methods of weed control included mowing, flooding, cultivating, smothering, burning, and crop rotation. Though these methods are still important, other means are perhaps more typical today, particularly the use of herbicide (plant-killing) chemicals. Another technique is to introduce insects that attack only the unwanted plant and destroy it while leaving the crop plants unharmed.
As a consequence, the design and operation of such equipment requires increased investment in research and development to enhance their operational and performance characteristics (see also, Human and Animal Powered Machinery).

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