免耕玉米田化学除草新混剂使用技术

通过对免耕玉米田不同除草剂使用方法和用量的研究表明,田间若以禾本科杂草为主可用单剂防治,若禾本科杂草和阔叶杂草混生以使用混剂为好,且采用土壤处理法防效最佳。49.2%烟·乙·莠WP茎叶处理最佳用量为1476～2214ga.i./hm2;63%烟·莠WP最佳用量为756～945ga.i./hm2;施药时期为玉米4～6叶期,杂草2～4叶期。49.2%烟·乙·莠WP土壤处理最佳用量为738～1107ga.i./hm2;48%乙·莠SC用量为1440ga.i./hm2。

Research on Mixed Herbicide Technology in Zero Tillage Corn Field

According to the researches on the usage of herbicided in zero tillage corn field, the results showed that thesingle herbicide could be adopted in the field-grown grassy weed. But the mixed herbicide was the best choice in thefield-grown grassy and broad leaf weed and the best method was the soil treatment. A 49.2% WP of nicosulfuron acetocholr atrazineat 1476-2214g a.i./ha and a 63% WP of nicosulfuron atrazine at 756-945 g a.i./ha could probvide the best control bythe stem leaf treatment. The best application timing was the 4-6 leaf stage of corn and 2-4 leaf stage of weed. Ifadopting soil treatment, the best dosage of nicosulfuron acetocholr atrazine and nicosulfuron atrazine were 738-1107g a.i./ha and 1440g a.i./ha, respectively.