Factors Affecting Interaction and Distribution of Haplopappus Divaricatus and Conyza Canadensis in North Carolina Old Fields

摘要: Haplopappus divaricatus and Conyza canadensis commonly appear in first—year old fields of North Carolina. is very rare the Carolina Piedmont, but occurs varying densities on coastal plain (0—83.8% relative density 26 fields). Within plain, there no east—west or north—south trend distribution Haplopappus, correlation with most recent grown crop found. Fields disturbed fall winter, deep sandy soils low clay content, moisture retention, available nutrients had high correspondingly Conyza. plants transplanted from to Piedmont survived produced large numbers viable seeds, seedlings grew following year around these transplants. Transplants greenhouse grew, those greater dry weights. Haplo...