皖西北烟区烟田杂草的分布与防除

采用五级目测法，对我省西北烟区的烟田杂草进行调查。结果表明，该烟区烟田杂草共２１科，４４属，５３种，其中优势种１４种。优势杂草群落组合５１种，出现频率较高的１１种。达三级以上危害较严重的田块为３１．１％。

Survey of tobacco field weeds in the tobacco zone of northwestern Anhui

The survey in the tobacco fields of the Northwest Anhui indicated that there are d3 species of weeds under 44genuses of 21 families, in which 14 species are dominant. there are 51 species community combiations of weeds in which 11are of high frequency. The survey also showed that 31. 1 % of the tobacco fields were damaged by weeds seriously.