Occurrence of weeds in wheat field and its influence on wheat production
To investigate the occurrence of weeds in wheat fields in Changzhou area,Jiangsu Province and their impact on wheat production,a large-scale survey of weed occurrence in wheat fields,as well as surveys of weed occurrence in wheat fields under different tillage methods(deep tillage,shallow rotation)were organized,different chemical treatments were set up(treatment A,33%fluoxystrobin·furoxime·pyrifluoroacetamide;treatment B,35%fluoxystrobin·pyrifluoroacetamide;treatment C,41%fluoxystrobin;treatment D,60%propiconazole·iprone;treatment E,20%fluoxystrobin;with water as a control)to explore the effects of each treatment on wheat production,including weed occurrence,yield,etc.The results showed that the occurrence of weeds in wheat fields in the study area showed a gradually increasing trend,the changes of monocotyledonous weeds more obvious.The main dominant species were Poaceae weeds such as Alopecurus japonicus,Alopecurus aequalis,and Beckmannia syzigachne.Compared with shallow rotation,deep tillage tends to exacerbate weed occurrence.All treatments were safe for wheat growth,among them,treatment A had the least weeds in the field and the highest wheat yield;in terms of the impact of weeds on yield,it mainly affected the number of spikes per unit area of wheat,and then affected yield,with the number of monocotyledonous weeds having the greatest impact on spike number 50 days after application.The research provides references for efficient weed control in wheat fields.
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