Transect numbers 1, 5, 7 and 12 were used for pitfall trapping, and these were chosen to avoid the proximity of other experimental protocols where possible. Twelve traps were distributed across each half-field, with single traps positioned at 2, 8 and 32 m from the crop edge along 4 of 12 transects ( Fig. Each was two-thirds filled with a 50:50 mixture of tap water and ethylene glycol as a preservative. Pitfall traps were used to survey populations of invertebrates active at the soil surface (after Luff, 1996) and consisted of 6 cm diameter plastic cups, sunk in the ground with the cup-lip level with the soil surface.
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