1. 602 seed m -2 in cohort 2 in O3. Starting with the same initial soil seedbank densities, the 4-year rotation could tolerate an increase of at least 310-fold the cumulative per unit area seed production threshold of the 2-year rotation. In details, ? 4a would remain stable if seed production in C4 was from 4,426 to 454 seeds plant -1 in cohort 1 and from 3,066 to 6,152 seeds plant -1 in cohort 2; seed production in S4 was from 105 to 129 seeds plant -1 in cohort 1 and from 83 to 123 seeds plant -1 in cohort 2; seed production in O4 was from 71 to 96 seeds plant -1 in cohort 1 and from 56 to 103 seeds plant -1 in cohort 2; and seed production in A4 was from 89 to 176 seeds plant -1 . We only simulated seed production in cohort 1 in the A4 environment because cohorts 2 and later produced under 110 seeds plant -1 , one-eighth the starting value of mean fecundity in the simulation (800). This range of seed production was equivalent to 16,709 -1,714 seeds m -2 in cohort 1 and 6;details
2. Comparing estimates of seed viability in three foxtail (Setaria) species using the imbibed seed crush test with and without additional tetrazolium testing;J K Borza;Weed Technol,2007
3. Emergence and persistence of seed of velvetleaf, common waterhemp, woolly cupgrass, and giant foxtail;D D Buhler;Weed Sci,2001