论文部分内容阅读
杂草的种类和分布 1982、1983两年,我们在全县30个公社、93个村、148个生产队调查了不同类型的棉田1032亩和苗床139床,1984年又在各农业区调查了棉田184亩和苗床32床,基本弄清了本县棉田杂草的主要种类和分布。从调查情况来看,棉田主要杂草有14科32种。其中马唐、铁苋菜、千金子、狗尾草、蟋蟀草、旱稗、鳢肠等为主要优势杂草。西部及沿江地区,旱稗及千金子较多;中部旱粮作物地区狗尾草、马唐较多;通东地区苋菜、旱稗等较多。 杂草的分布与茬口有关,连作年限越多,
Types and distribution of weeds In 1982 and 1983, we investigated 1,032 mu of different types of cotton fields and 139 beds of beds in 30 communes, 93 villages and 148 production teams in the county. In 1984, we surveyed various agricultural areas 184 acres of cotton fields and seedbed 32 beds, the basic understanding of the main types of cotton weeds and distribution. From the survey situation, the main cotton weeds in 14 families and 32 species. Among them, Crabgrass, Echinacea, Trichosanthes, Setaria viridis, Cricket grass, dry barnyard grass, scallion, etc. as the main advantage of weeds. Arid and barnyardgrass were more abundant in the western and Yangtze River areas; more, Setaria viridis and Crabgrass were found in the dry grain crops in central China; amaranth and barnyardgrass were the most abundant in the East China. The distribution of weeds and stubble, the longer the continuous operation,