山东省泰安市甘薯田杂草调查

山东省泰安市甘薯田杂草隶属12科35种,以禾本科杂草与阔叶杂草混生为主,常见一年生禾本科杂草以牛筋草、马唐、狗尾草为主,阔叶杂草以反枝苋、马齿苋、铁苋菜、饭包草为主,莎草科杂草以碎米莎草、异型莎草及香附子为主。甘薯扦插后生长前期主要以阔叶杂草反枝苋、藜、马齿苋、苘麻、碎米莎草占优势,甘薯生长后期(6～7月),以一年生禾本科杂草牛筋草、马唐、稗草及狗尾草为主。甘薯田杂草的防除重点是扦插后至封垄前,此阶段及时有效的除草对甘薯的优质高产至关重要。

Investigation of Weeds in Sweet Potato Field of Tai'an, Shandong Province

The weed communities in sweet potato fields in Tai＇an,Shandong composed of 35 species belonging to 12 fami- lies in the mixtures grass and broadleaf weeds. Eleusine indica, Digitaria sanguinalis, Setaria viridis are the main annual grass weeds, Amaranthus retroflexus, Portulaca oleracea, Acalypha australis, Commelina benghalensis are the main broad- leaf weeds and Cyperus iria, Cyperus difformis , Cyperus rotundus are the main Cyperaceae weeds. Amaranthus retroflexus , Chenopodium album, Portulaca oleracea, Abutilon theophrasti and Cyperus iria are the main weeds at the early growth stage of sweet potato, while annual grass weeds including Eleusine indica, Digitaria sanguinalis, Echinochloa cruz - galli and Setaria viridis are the main weeds at the stage of 6 to 7 months growth after transplanting. The weed controlling should be put emphasis on the period of transplanting to ridge closing,in which it is essential to get high yield and good quality for sweet potato via an effectively and timely weed controlling.