At present, summer corn enters the sowing period, and the recent high temperature and rain are beneficial to the occurrence of weeds. Once the grass is formed, it will seriously affect the emergence and growth of corn. Chemical weeding is an effective measure to control the damage of summer corn field. It is necessary to grasp the two key periods of pre-emergence and 3~5 leaf stage after corn sowing, and carry out weed control to control weed damage.
   "blocking" weeding technology
   In the corn seedlings, the "blocking" treatment is carried out before the seedlings, that is, the soil-blocking herbicide is combined with the herbicide herbicide, and the single application has the dual effects of soil sealing and killing the grass. For rotary tillage plots, only soil-blocking herbicides can be used.
   Agent selection and formula: soil-blocked herbicide, you can choose atrazine 38% suspension agent 100~150ml + acetochlor 50% emulsifiable concentrate 100ml per mus , or isopropyl oxalate 40% suspension agent 200ml . Extinction herbicide, using 150 % to 200ml of glyphosate 41% water per acre , diluted to 50kg of water, sprayed evenly on the surface.
   "Stem and leaf" treatment weeding technology
   In the 3~5 leaf stage of corn (weed 2~4 leaf stage), the herbicide is treated with stems and leaves to spray the stems and leaves to prevent weeds. Drug selection: per mu can choose nicosulfuron 4% suspending agent 70~100ml , or nicosulfuron 4% suspending agent 50~80ml + atrazine 38% suspending agent 100~150ml , 50kg of water , evenly spray.
   Different maize varieties have different sensitivities to herbicides treated with stems and leaves. The order of safety is that the dentition is larger than the hard granules than the blasted corn is larger than the sweet corn. It is sensitive to the corn before and after the second leaf stage. It should be avoided. .
   Spraying the herbicide should use a fan-shaped nozzle, and spray the water evenly according to the safe dosage, without heavy spray or leakage. Soils with high fertility and high organic matter content should be selected for the high limit of recommended dosage. Sandy land, soil thinner and low organic matter content are selected to a lower limit.
   (Beijing Plant Protection Station Yuan Zhiqiang Dong Jie Yang Jianguo)
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