不同除草剂对紫花苜蓿生长和杂草防除的影响

选用6种除草剂在紫花苜蓿田进行杂草防除和安全性试验。结果表明,咪唑乙烟酸可用于苗后,剂量以1800mL/hm^2为宜;精喹禾灵、精氟吡禾灵相对安全,适宜剂量分别为225、450mL/hm^2;2,4-滴丁酯在苗前、精唑禾草灵在苗前或苗后使用对苜蓿均有危害;乙氧氟草醚对稗草防除效果很好,但对苜蓿出苗和生长危害严重,所以乙氧氟草醚适合用于苜蓿播种前施用,适宜剂量450mL/hm^2,待其失去药效,再进行苜蓿种植。

Effects of Herbicides to Alfalfa Growth and Weeds Control

This experiment choose imazethapyr,butyl 2,4-dichlorophenoxy acetate,quizalofop-P-ethyl,Haloxyfop-R-methyl,oxyfluorfen,fenoxaprop-P-ethyl in alfalfa area of Shandong Agriculture University. The result showed that imazethapyr could be used after seeding and the proper dosage is 1800 mL/ha; quizalofop-P-ethyl and haloxyfop-R-methyl are comparative safe herbicide and the proper dosage is 225,450 mL/ha,respectively,butyl 2,4-dichlorophenoxy acetate could be used before seeding,fenoxaprop-P-ethyl have deleterious effects both before or after seeding,so butyl 2,4-dichlorophenoxy acetate,fenoxaprop-P-ethyl are not proper in clover fields,oxgfluorfen has perfect effect in Echinochlia crus galli restraining,but has deleterious effects to alfalfa germinating and growing,that is why oxgfluorfen should be used before seeding and the best dosage is 450 mL/ha. Then after its effects disappeared,the alfalfa could be planted.