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Borrow a goat, and buy a length of rope and a stake. The rope should be no longer than half the diameter of your plot. Drive the stake into the ground at the midpoint of your plot. Attach the goat to the rope and the rope to the stake. Point the goat at a tangent to an imaginary circle and leave him for about 2 weeks. On returning to the plot, bag up the goat manure, and return the goat. Alternatively if the grass is very dry set fire to it. The farmers call it slash and burn, just don't bother with the slashing bit.