摘 要 ：为了解杂草稻(暂定名:Oryza sativa L.)的生物学特性和探索杂草稻的有效控制技术,开展了杂草稻落粒粳的防治研究。杂草稻落粒粳是在我国东北辽宁省丹东市的水稻田发现的,其植株比常规栽培稻高,容易掉粒。落粒粳颖果呈中长型,果壳稻草色或黄间黑灰色,小穗无芒或有芒,芒长4~12cm。颖果千粒重2.35g。种皮桔红色。落粒粳种子在13~38℃条件下的发芽率均大于88%。水层2.5~10cm处理,落粒粳植株干重减少50%~69%。二甲戊灵660~990 g ai/hm2处理对落粒粳的植株鲜重防效达到优良水平。二甲戊灵对常规栽培稻秀水11的生长无不良影响,对水稻安全。
Abstract:The objectives of this study were to determine biological characteristics of a weedy rice Luolijing (interim name: Oryza sativa L.), and effects of water regime and herbicides on its emergence and growth. Weedy rice Luolijing was found infesting in paddy field in Dandong, Liaoning Province, northeast of China. The height of the weedy rice was taller than most cultivated rice cultivars, and had medium-long grains without awns or with awns of 4-12 cm that was easily to shatter. The color of grains was straw-like or yellow with dark gray strips. Average 1000-grain weight was 2.35g. Periopsis of the weedy rice was nacarat. The emergence rate of the weed was more than 88% at 13-38℃. Irrigating water of 2.5-10 cm depth reduced the dry weight of the weed by 50% -69%. Pendimethalin at the rate of 660-990 g ai/hm2 provided excellent control of the weedy rice, and did not injure the transplanted rice cultivar Xiushui 11.