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Fig. 1. The quadrat grid design for sampling white clover plants at the permanent quadrat locations. The numbers indicate the exact spot where leaves were collected if present. The sampling points were defined by the center of the quadrat (sampling point 19) and numbered sampling points on four concentric circles with radii of 22.8, 45.6, 68.4, and 85.6 cm, respectively. PIN, position of permanent steel pins in the field, was used for positioning the grid.
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