Click on image to view larger version.
Fig. 5. Effect of N source over four consecutive years on the weed seedbank at the conclusion of the 4-yr experiment. The grass weed seedbank was composed of approximately 80% wild oat and 20% green foxtail. The broadleaf weed seedbank was composed of approximately 55% wild mustard, 35% common lambsquarters, and 10% other species such as redroot pigweed (Amaranthus retroflexus L.) and kochia [Kochia scoparia (L.) Schrad.]. Bars on the graph within a weed type with the same letter are not significantly different according to Fisher's Protected LSD test at the 5% probability level.
