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.
A machine that can cut mature corn without shattering the ripe kernels at the top of its long slender stem, gather together and convey these stem heads-first into a threshing cylinder, where the bulk of the kernels are separated from the non-grain material by a combination of impact and sieving, and where the remaining separation is achieved by a combination of further sieving, flotation and vibration.

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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.
A machine that can cut mature corn without shattering the ripe kernels at the top of its long slender stem, gather together and convey these stem heads-first into a threshing cylinder, where the bulk of the kernels are separated from the non-grain material by a combination of impact and sieving, and where the remaining separation is achieved by a combination of further sieving, flotation and vibration.

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