Tilling, or plowing, a field prepares the soil for planting and destroys weeds, but a Roundup-ready crop doesn't require extensive tillage.

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Soldiers may be getting it from soil or from field hospitals in Iraq or even the big U.S. base in Landstuhl, Germany.

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The twin landers, each the size of a desk and weighing 375 pounds (170 kilograms), will ramble dozens of meters a day, drilling into rocks and scooping up soil in preliminary field studies to help identify ancient oases.

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Farmers plant a warm-season perennial grass and fallow the field for two years, improving soil quality and water-holding capacity.

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On a recent morning at the academy, a bulldozer and a dump truck leveled a stretch of soil for a running field.

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In this process a piece of tissue is cut from a healthy plant and grown in a sterile environment into several plantlets that root in pasteurized soil before being transferred to the field.

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However in the case of Neal Soil Suppliers - where dairy and food effluent was spread over a field - there had been "substantial and serious pollution".

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The developed equipment is easy to use, and has a lower cost, so allowed the execution of the multiple field experiments necessary to obtain good and valuable information to study the runoff generation and soil losses processes.

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