The Study Of The Weed Community And Chemical Control In Wheat Fields In Heze

The species and community structure of the weeds were investigated in wheat fields of the city of Heze, Herbicides effect filtration of fields were done to different community weeds and make sure the combination of different herbicides. The coefficient and the optimum combination were studied in laboratory。Make sure the chemical controlling technology of weeds in wheat fields on the base of studies. The results are as follows:1. Species harm characteristics and community structure in wheat field. The species and community structure of the weeds were investigated using 5 categories rating system by drying district, paddy district and yellow river streamsides of wheat fields in the city of Heze。The result indicated that weeds in these wheat areas almost belonged to 42 species, 17 families. The main grasses are: flixweed tansymustard, shepherdspurse, tender catchweed bedstraw, butter weed, wormseed mustard, lyrate hemistepta, equal alopecurus, keng stiffgrass wild oat, japanese bromegrass, italican ryegrass comm.on roegneria goat grass, common reed little thistle,brachyotus sowthestle, bitter lettuce, chinese lettuce, siberian cocklebur, carpet cinquefoil,cow soapwort, geminate speedwell, aquatic malachium, cow soapwort, common seepweed, broom cypress, creepingthymeleaf sandwort, pedunchlate trigonotis, white- flower lagopsis, wormwoodlike motherwort, corn gromell, sunneuphorbia, field bindweed eruopean glorybind, dogbane, comm.on knotgrasss, branched horsetail, humifuse euphorbia, narrowleaf vetch, etc.The weeds which happen in different areas are different. In dry farminges, the dominance weed communities of the wheat croplands include flixweed tansymustard, shepherdspurse, tender catchweedbedstraw, canadian fleabane, cow soapwort, carpet cinquefoil etc. In rice paddy areas the dominance weed communities of the wheat croplands include flixweed tansymustard,keng stiffgrass, canadian fleabane, cowsoapwort, shepherdspurse, tender catchweed bedstraw etc. In Yellow River bottomlands the dominance weed communities of the wheat croplands include Flixweed Tansymustard, lyrate hemistepta .etc.