However, Prof Lin Field, head of crop protection at Rothamsted Research, said she was pleased with the outcome of the vote.

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My 1979 dissertation was a model relating interannual and interseasonal variations in the shape of the atmosphere, as reflected by the surface barometric pressure field, to variations crop yields across the United States.

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So, for example, chemical pesticide or pollen from genetically engineered plants wafting onto an organic crop from an adjacent field does not cause the harvest to lose its organic status.

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The best evidence is a report to Anslinger by a field agent on the 1934-35 hemp crop in Minnesota.

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However, heavy machinery and herbicides are required to prepare a seedbed, and with several applications of fertiliser and sprays the field will see far more machinery use than any similar organic crop.

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Well, in the dozen years since those two biggies were founded, countless other Internet tools online travel agents, booking engines, review sites and more have been added to the mix, with an ever-growing crop of newbies striking us as particularly noteworthy additions to the field.

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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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In part that's because the Maryland field has more organic matter dead vegetation (mostly the residue from the previous crop), microorganisms, manure or compost.

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