Fig. 1. Percentage residue remaining in litter-bags for each of four corn hybrids through 658 d of burial. RW = Bt⁺ containing Cry3Bb1 protein active against corn rootworm (DKC60–12); CB+RW = BT⁺⁺ stacked, Cry1Ab proteins active against European corn borer and Cry3Bb1 protein active against corn rootworm (DKC60–14); Base = Bt^–, base genetics containing no Bt genes (DKC60–15), CB = Bt⁺ containing Cry1Ab protein active against European corn borer (DKC60–16). Error bars represent one standard deviation for n = 9 replicate litter-bags per hybrid.