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.
There is a long history of agricultural mechanization that has been human and animal powered rather than engine powered. The difference in scale is quite staggering and is a measure of the economic gulf between the rich and the poor on this planet. For example, an average horse plowing the soil at an average rate will perform work at a rate of one horsepower (hp). In contrast, a 100 hp (75 kW) tractor could work (e.g. plowing the soil) at a rate one hundred times faster than the horse.

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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.
There is a long history of agricultural mechanization that has been human and animal powered rather than engine powered. The difference in scale is quite staggering and is a measure of the economic gulf between the rich and the poor on this planet. For example, an average horse plowing the soil at an average rate will perform work at a rate of one horsepower (hp). In contrast, a 100 hp (75 kW) tractor could work (e.g. plowing the soil) at a rate one hundred times faster than the horse.

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