Investigation Of Weeds In Wheat And Maize Fields In Changli

This paper introduced that the investigations of weed species and number of winter wheat fields and spring and summer corn fields in Changli county,Hebei province in 2015.The investigation results showed:(1)The weeds in winter wheat in this area included 14 families 23 species,of which mostly were broadleaf weeds.Winter wheat of different densities had a significant impact on the relatively dominant of goosefoot,smallflower galinsoga herb and shepherd’ purse and other dominant weed species,but did not affect the goosefoot,smallflower galinsoga herb,digitaria sanguinalis and shepherd’s purse and other weeds as the dominant species.Different fertilization of winter wheat fields had a significant impact on the relatively dominant of goosefoot,smallflower galinsoga herb and shepherd’ purse and other dominant weed species,but did not affect the goosefoot,shepherd’ purse and other weeds as the dominant species.Different varieties of winter wheat had little impact on the relatively dominant of dominant weed species.Scandent hop and goosefoot were the dominant species in the early and middle growth of the three winter wheats,digitaria later became the most dominant species.(2)There were 18 families and 31 species of weeds in spring and summer corn fields,and the similarity was more than 90%.The weeds in spring corn field had a total of 26 species of 16 families,the main weeds included digitaria sanguinalis,Convolvulaceae(field bindweed,morning glory,calustegia hederacea)and amaranthus retroflexus.There were 13 families and 24 species of summer corn,the main weeds were crabgrass,trigonotis peduncularis,bamyardgrass.Types of weeds of spring corn in different locations and different planting environment were highly similar,but the dominant species were different.Weed dominant species of spring corn in different locations were mainly crabgrass and amaranthus retroflexus.Under different planting conditions,the dominant species were mainly rice straw.With spring corn with different crop intercropping,weed species were highly similar,the advantages were different,mainly crabgrass,iron amaranth.The effects of plastic film mulching and non-plastic film mulching on weeds in spring corn field were not significant.Investigation of weeds in summer corn fields in different plots,commonweed dominant species was crabgrass,other weed species were significant differences.This paper was to provide a reliable references for weed control in winter wheat and spring and summer corn fields.