免耕播种春玉米田土壤封闭除草药剂试验

对5种除草剂的14个组合处理进行田间比较试验,结果表明:莠去津与3种除草剂分别混用的除草效果比单用莠去津好。筛选出了适合免耕春玉米田土壤封闭使用的高效除草剂配方,即每公顷用38%莠去津悬浮剂1650ml加90%禾耐斯乳油900ml,或96%金都尔乳油900ml,或33%施田补乳油1950ml,于玉米播后至出苗前施药,除草效果可达92%;对有苘麻(Abutilontheophrasti)和铁苋菜(AcalyphaaustralisLinn.)等难治的双子叶杂草较多地块,每公顷用96%金都尔乳油900~1200ml或90%禾耐斯乳油900~1050ml加80%阔草清水分散粒剂45~60g,防除双子叶杂草效果达96%以上;另外,对免耕春播玉米田使用土壤封闭方法除草,播种前或播种同时杀明草也是必要的。

Trails of Herbicides in the non~tillage spring maize field

The herbicide experimental trails, including 5 herbicides and their fourteen combination treatments, were conducted in spring maize field. Atrazine mixed with each of the 3 herbicides had better phytocidal effect than it was applied alone. The dosages, which were 1650 ml/hm2 of Atrazine38SC with 900 ml/hm2 of Acetochlor90EC,or 900 ml/hm2 of s-metolachlor96EC,or 1950 ml/hm2 of Pendimethalin33EC,were applied to soil surface post-sowing and pre-emerge, the phytocidal efficacies reached to 92%; For the field with dicotyledon weeds, especially Abutilon theophrasti and Acalypha australis Linn, applying 45~60 g/hm2 of Flumetsulam80WG plus either 900~1200 ml/hm2 of s-metolachlor96EC or 900~1050 ml/hm2 of Acetochlor90EC, dicotyledon weeds efficacies were higher than 96%. Additionally, the emerged weeds should be eliminated before these herbicides application.