豫西夏玉米田杂草发生及化学防除技术研究

为搞清豫西地区杂草的发生消长规律,进行有针对性的防除,对夏玉米田杂草的发生种类、消长规律,及其对玉米的影响等进行调查研究,并在大田进行防除夏玉米田杂草的药剂筛选试验。豫西夏玉米田杂草有23种,以马唐、牛筋草、千金子、狗尾草为优势草种。苗前除草剂试验结果表明:除草净、乙草合剂、乙除、乙莠对夏玉米田杂草30d鲜重防效达92.5%～97.5%。在苗后除草剂试验中,15%高渗克无踪防效达80.2%,其中增效剂ZB-1对克无踪的增效效果最好,ZB-5次之。

Study on Occurrence and Chemical Conrtol of Weeds in Summer Maize Field in the West of Henan Province

In order to know the rules of occurrence and growing of weeds in the w est of Henan province, the correspondent experience were made to investigate the occurrence types, rules of growing as well as its effect to the maize, and its experiment on selection of chemical control was carried out. The result of the t rial of pre-emergence herbicide indicate that the fresh weight reduction of 45% acetochlor and cyanazine,35% pendimethain and cyanazine,35% acetochlor and pendi methain,40% acetochlor and atrazine is up to 92.5 to 97.5%. In the trial of post -emergence herbicide, the pesticide effect of 15% highly permeable Paraquat is u p to 80.2%, and the effect of synergist ZB-1 is best to promote the effect of CC C, and the ZB-5 is second best.