13 



Table 9. Effect of seeding date In relation to glyphosate application 

 on first-harvest yield of alfalfa at four locations. 



Glyphosate Seeding Alfalfa yield by location 



application date Madbury Lee Pittsfield Northwood 



tons/acre 



Fall Early May x 0.17 cd 0.41 be x 



Fall Mid- late May x 0.10 d 0.30 c 0.00 c 



Early May Early May 1.10 a 0.26 b 0.38 be x 



Early May Mid- late May 0.90 a 0.39 a 0.54 a 0.16 a 



Mid- late May Mid- late May 0.64 b 0.22 be 0.44 b 0.06 b 



"Means followed by the same letter within a column do not differ at the 

 5% level. 



Alfalfa yields are for the first harvest and are averaged over glyphosate 

 rates of 1.3, 2,0, and 2.7 lbs/acre, except at Madbury, which received 

 only 2.0 lbs/acre. 



Table 10. Effect of seeding date in relation to glyphosate application 

 on ground cover ratings of alfalfa at four locations. 



r^eans followed by the same letter within a column do not differ at the 5% level 



Ratings of alfalfa ground cover were made three to four weeks following harvest 

 during the seeding year and are averaged over glyphosate rates of 1.3, 2.0, 

 and 2.7 lbs/acre, except at Madbury, which received only 2.0 lbs/acre. 



