Table 2. — Summary of significant (Pr 0.05) coefficients of determination (R^) for the linear regression screens of independent variables for 

 three sampling dates 



Main effects^ 



Terpenes 



Date and Total p-pinene + 



independent Dry Soluble Soluble soluble Total Total [3-phellan- carene + 



variable matter pentoses hexoses sugars pentoses Starch nitrogen Total a-pinene drene myrcene 



JUNE 6 Coefficient of determination (R^) — 



Diameter at 



breast height (D) 

 Length of crown, 



% of total 0.12 0.08 0.10 0.12 



Height .05 



Phloem thickness (P) .18 .13 .09 

 Growth, average annual 



5-yr. radial (G) 0.06 0.05 .28 .11 .24 .15 



Age 0.05 .07 .06 0.05 .07 .08 .09 



Additive effects 



P, G .30 .11 .25 .16 



P, G, D .30 .12 .26 .18 



JULY 10 



Diameter at 



breast height (D) 

 Length of crown, 



% of total 



Height 0.07 



Phloem thickness (P) .12 .08 .06 .07 .07 .07 .07 



Growth, average annual 



5-yr. radial (G) .05 .04 



Age .09 .05 .06 



Additive effects 









P, 



G 



.07 



.07 



.07 



.07 









P, 



G, D 



.10 



.10 



.10 



.10 



JULY 31 



















Diameter at 



















breast height (D) 











.06 





.08 



.07 



Length of crown, 



















% of total 



.08 



.10 







.18 





.18 



.18 



Height 







.04 













Phloem thickness (P) 



.06 .04 .06 









.30 



.18 



.34 



.26 



Growth, average annual 



















5-yr. radial (G) 



.07 .07 







.08 



.24 



.14 



.26 



.26 



Age 



.10 





























Additive effects 











P, 



G 



.35 



.21 



.39 



.34 









P, 



G, D 



.35 



.22 



.39 



.34 



'Total hexoses and total sugars were screened with nonsignificant results. 



3 



