Table 4.— Comparison of fierbicide treatments by mean numbers of ectomycorrhizal short roots (cm) on 10-cm 

 segments of main lateral roots, based on 30 samples for each treatment 



Nursery 



1 icaiiii^iii 







Mountain Home 









Montana State 





Lodgepole pine 



Blue 



spruce 



Austrian pine 



Ponderosa pine 



Douglas-fir 



X 







X 



Q 



X 







X 







X 







Control (no herbicide) 



45.1 



8.5 



55.1 



11.4 



59.9 



7.7 



34.3 



6.8 



28.3 



7.7 



Bifenox 























Bif. 1x1, + PG3 



41.6a'' 



7.9 



57.9a 



11.0 



58.1a 



7.9 



37.1a 



10.1 



19.0a* -6 



3.6 



Bif. 1 X , PS 



40.3a 



6.4 



58.0a 



11.7 



61.5a 



8.1 



38.4a 



8.8 



18.8a* ' 



3.7 



Bif. 1 X , PG 



42.3a 



7.7 



58.9a 



14.5 



61.9a 



9.0 



38.9a 



10.0 



21.4a* * 



3.8 



Bif. 2x, PS 



35.8b** 



11.6 



55.9a 



11.8 



61.0a 



9.8 



33.6a 



7.1 



23.8b** 



5.4 



Bif. 2x , PG 



41.2a 



6.5 



64.4b* 



* 11.6 



60.8a 



9.7 



36.0a 



8.1 



16.3c* * 



8.5 



DCPA 























DCPA 1 X , PS + PG 



47.5a 



7.3 



52.2a 



11.3 



56.5a 



7.6 



33.0a 



13.6 



21.8a* * 



6.2 



DCPA 1 « , PS 



42.1b 



8.3 



57.3a 



10.9 



62.9a 



9.3 



35.2b 



7.8 



21.9a* * 



6.4 



DCPA 1 X, PG 



36.6c** 



12.4 



52.1a 



12.9 



59.4a 



9.9 



35.2b 



6.9 



21.0a** 



5.3 



DCPA 2x, PS 



46.0a 



8.3 



57.6a 



12.2 



60.5a 



8.1 



41. 3c*^ 



12.5 



19.1b* * 



4.7 



DCPA 2x, PG 



43.6b 



8.7 



55.7a 



11.6 



63.3a 



12.1 



38.6b 



7.8 



19.5b** 



3.2 



Napropamide 























Nap. 1 X , PS + PG 



_5 













37.8a 



9.0 



20.5a* • 



3.6 



Nap. 1 X, PS 















38.3a 



8.9 



24.1b** 



4.5 



Nap. 1 X, PG 















34.1a 



7.1 



23.4a* * 



7.0 



Nap. 2x , PS 















36.4a 



7.7 



20.7a** 



5.3 



Nap. 2x, PG 















35.1a 



8.0 



20.6a* ■ 



4.4 



M X = applied concentration according to manufacturer's recommendation, 2x = double concentration, for actual concentra- 

 tion of active ingredient (see table 1). 

 ^PS = immediate,'/ postseeding. 



■'PG = postgermination. usually 4 to 5 weeks after seedling emergence. 



"Treatments within a single herbicide group and species (down column) that do not share a common subscript letter are signifi- 

 cantly different to at least a = 0.05 level, Duncan's multiple range test. 

 ^Dash indicates this combination not tested. 



^** = treatment differs from appropriate control (head of column) to at least o ^ 0.01 level, Duncan's multiple range test. 

 '* = treatment differs from appropriate control (head of column) to at least o = 0.05 level, Duncan's multiple range test. 



Table 5.— Overall interactions between sources of variation and numbers of ectomycorrhizal short roots (cm) 



Source of variation 



Nursery 



Coeur d'Alene Albuquerque 



Mount 

 Sopris 



Lucky 

 Peak 



Mountain 

 Home 



Montana 

 State 



Within individual source 



Species 

 Herbicide 



Rate ■ V - 



Two-way interactions 

 Species X herbicide 

 Species x rate 

 Herbicide x rate 



Three-way interactions 



Species X herbicide x rate 



NS 



•3 



NS4 

 NS 



NS 



NS 

 NS 



NS 



NS 

 NS 



NS 

 NS 



NS 

 NS 

 NS 



NS 



''■'Interaction significant, a = 0.01, ANOVA. 



^Dash indicates combination not tested in experimental design. 



-''Interaction significant, o = 0.05, ANOVA. 



"•NS interaction not significant. 



5 



