Fig. 1. Scatchard distribution plots for Cu binding capacity of wheat straw– and crimson clover–derived water-extractable C showing water-extractable C extracted from soil amendments both initially and following a 7-d incubation. Filled circles = bulk extract (<0.45 µm), empty circles = low molecular weight (LMW) fraction (<1 kDa) of water-extractable C. (A) Wheat straw, Day 0; (B) wheat straw, Day 7; (C) crimson clover, Day 0; (D) crimson clover, Day 7.