东北地区稻田杂草稻发生情况调查

采用七级目测法于2009年7—9月对辽宁、黑龙江、吉林3省14个地区水稻田杂草稻的相对盖度、多度、高度进行了调查。结果表明,7月杂草稻发生相对较轻,综合值为2.00%～14.00%,密度为0.58～20.91株/100 m2;8—9月辽宁省、黑龙江省大部分地区杂草稻发生普遍加重,辽宁省营口、沈阳、盘锦地区,黑龙江省黑河、佳木斯地区杂草稻综合值较高,密度较大,其中黑河地区9月杂草稻发生危害重,综合值达到52.00%。

Investigation of Weedy Rice Occurrence in the Rice Field in Northeastern China

The occurrence situation of weedy rice was investigated in the rice field of 14 regions in Liaoning,Heilongjiang and Jilin Province,during the period of time from July to September in 2009.Relative coverage,relative abundance and relative height of weedy rice in surveyed fields were evaluated comprehensively by eyesight of weed damages to crops in seven scales.Investgation results showed that the occurrence of weedy rice in surveyed regions was relatively light,with a overall value as 2.00%~14.00% and a density as 0.58~20.91 plants/100 m2 in July.The occurrence of weedy rice in most of surveyed regions in Liaoning and Heilongjiang Province became heavy in August and September,especially the overall value and the density of weed rice were higher in Yingkou,Shenyang,Panjin region in Liaoning province and Heihe,Jiamusi region in Heilongjiang Province.Among these regions,the occurrence of weed rice in Heihe region in September was heavy,and the overall of weed rice value was 52.00%.