potential yield per acre was highest for trees on MAC 9 and M.9A (EMLA). In 

 1986, on a per acre basis, trees on OAR 1, MAC 24, and M.27 (EMLA) were the 

 poorest yielders. 



Table 1. Tree size and hypothetical density in the 1980 planting as measured 

 on October 15, 1986 



*Means in a column not followed by the same letter are significantly different. 



Table 2. Cumulative and 1986 yields per tree and per acre for the 1980 

 plant ing. 



Rootstock 



Yield yield 



per tree per tree 



(1986) (1983-86) 



(bu) (bu) 



Ottawa 3 

 M.7 (EMLA) 

 M.9A (EMLA) 

 M.26 (EMLA) 

 M.27 (EMLA) 

 M.9 

 MAC 9 

 MAC 24 

 OAR 1 



1.29 c* 

 2.03 b 

 1.11 c 

 1.57 be 

 0.27 d 

 0.43 d 

 2.02 b 

 2.72 a 

 0.48 d 



3.82 cd 

 5.06 be 

 3.12 d 

 4.41 be 

 0.80 e 

 1.46 e 

 5.19 b 

 7.51 a 

 1.43 e 



*Means in a column not followed by the same letters are significantly different. 



