15 



since treating with glyphosate on May 30 and waiting until August to seed 

 would sacrifice forage production during the seeding year, such a program 

 seems impractical. 



Table 11. Comparison of August and late spring no-till seeding of alfalfa 

 into dense quackgrass. 



Treatment 



Seeding 



Herbicide Date date 



Alfalfa content. Seasonal yields Alfalfa 



standing 

 spring harvest Forage Alfalfa rating 



Paraquat Aug. 8 Aug. 9 



Glyphosate May 30 Aug. 9 



Paraquat June 3 June 4 



Glyphosate May 30 June 4 



% 



3 d 



49 b 



27 c 



97 a 



— tons/acre — 

 1.6 c 0.1 c 

 2.9 b 1.8 b 

 2.4 b 1.3 b 

 4.0 a 3.9 a 



% optimum 



3 d 



67 b 



47 c 



93 a 



'lleans followed by the same letter within a column do not differ at the 

 5% level. 



Total for the year following establishment . 



'Based on visual ratings by two observers on alfalfa ground cover and vigor 

 two weeks following last seasonal harvest. 



