摘要
在温室条件下研究了几种苗前除草剂单用或混用对苜蓿出苗和生长的影响 ,以及不同叶龄苜蓿对苗后除草剂的反应及添加助剂对药效的影响。结果表明 :咪唑乙烟酸在6 0～ 12 0 g/hm2 剂量下 ,于苗前施用 ,对苜蓿出苗和幼苗生长都有明显的抑制作用。咪唑乙烟酸(30 g/hm2 )与二甲戊灵 (495 g/hm2 )混用 ,对苜蓿的药害显著降低。苗后施用除草剂对苜蓿的安全性与叶龄密切相关。咪唑乙烟酸以 30～ 6 0 g/hm2 剂量在苜蓿 3叶期施用 ,对苜蓿安全 ;在12 0 g/hm2 用量下 ,对 5叶期的苜蓿无明显药害。乳氟禾草灵 (130～ 2 6 0 g/hm2 )和丙炔氟草胺(75～ 15 0 g/hm2 )无论是 3叶期还是 5叶期施用 ,对苜蓿幼苗都有严重的药害。与咪唑乙烟酸单用时比较 ,药液中添加 1.0 m L /L的平平加 - 15和 AM- 10 0及 5 .0 m L /L的 SDP。
Glasshouse experiments were conducted to evaluate the effect of pre and post herbicides on alfala ( Medicago sativa ) and addition of adjuvants on the performance of imazethapyr. Results indicated that imazethapyr applied pre emergence at 60 120 g/hm 2 resulted in significant injury to alfalfa both on emergence and on seedling growing. When applied in combination with pendimethalin (495 g/hm 2), the injury decreased greatly. The safety of post emergence herbicides closely related with growth stage of alfalfa. Imazethapyr at 120 g/hm 2 was excellently safe to alfalfa at 5 leaf stage and seriously damage at 3 leaf stage, and benazolin ethyl applied post emergence at 225～450 g/hm 2 was safe only after alfalfa 5 leaf stage. Growth of alfalfa was not damaged by addition of nonionic adjuvant PPJ 15, Am 100 or DPS in imazethapyr solution.
出处
《农药学学报》
CAS
CSCD
2002年第1期52-57,共6页
Chinese Journal of Pesticide Science
基金
北京市科委重点资助项目 (2 0 0 0 0 0 2 72 )
