眼子菜Potamogeton distinctus是多年生恶性杂草,在栾河流域中部5月中旬开始出苗,6月中、下旬渐布满田面,7月上旬开始抽穗、开花,8月下旬种子陆续成熟,千粒重3.53克。以形似鸡爪的短缩节鸡爪根越冬(详细描述见本刊1983年第5期14页)。 眼子菜对水稻的危害 眼子菜根系庞大,适应性强,与水稻争肥争水,恶化田间小气候。据在同一田块测 Potamogetonus distinctus is a perennial malignant weed that began to emerge in mid-May in the middle of the Luanhe River basin. In mid-June, the field was gradually covered with fields and heading and blooming in early July. Seeds were gradually matured in late August with a grain weight of 3.53 g . Shortened to the shape of chicken feet chicken feet claw roots overwintering (see article published in 1983, No. 5 of 14). Ocial vegetables on the dangers of rice Eye root vegetables large, adaptable, competing with rice fight water, aggravate the field microclimate. According to the same field measured