Influence of tillage type on vertical weed seedbank distribution in a sandy soil

The vertical distribution of weed seeds in the seedbank of a sandy soil und er three tillage systems (moldboard plow, chisel plow, and no-till) was est imated by a seedling-emergence method. The vertical distribution of the wee d seedbank differed with tillage type and depth of tillage. The no-till sys tem had the largest portion (90%) of the seedbank in the 0- to 5-cm layer. Chisel plowing distributed most of the seeds (66%) in the 5- to 10-cm layer . Moldboard plowing concentrated 71% of the seeds at the 10- to 15-cm depth . Our results suggest that the vertical distribution of the weed seedbank w ill be influenced by tillage type, depth of tillage, and soil type.