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.
Primary power sources are many and varied including solar, wind, hydroenergy and geothermal, which may be used to power stationery equipment (wind, hydroenergy), to provide heating or cooling (solar, geothermal) or to generate electricity (wind, hydroenergy) to service a multiplicity of on-farm activities (see also, Energy Sources: Renewable and Non Renewable).

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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.
Primary power sources are many and varied including solar, wind, hydroenergy and geothermal, which may be used to power stationery equipment (wind, hydroenergy), to provide heating or cooling (solar, geothermal) or to generate electricity (wind, hydroenergy) to service a multiplicity of on-farm activities (see also, Energy Sources: Renewable and Non Renewable).

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