Investigation and Analysis of Crop Field Weeds in Jilin Province

Basic status of weeds in crop fields has been investigated in 2000 with their species, density, distribution and advanced species groups.These fields include maize, rice, soybean and wheat fields in different ecological areas in Jilin province. The results show that there are 36 families, 130 species of weeds in sampling sites.Among them,17 species are gramineae,113 species are wide leaf, 27 families,103 species are in dry lands,14 families,29 species in water lands.27 families, 81 species in maize fields,25 families,78 species in soybean fields and 20 families,58 species in wheat fields.