RESULTS AND CONCLUSIONS 



Only fully emerged, normally developed seedlings were recorded as 

 germinates; 53 percent of the total emergence was recorded by August 16. 

 Interestingly enough, a total of 13 seed germinated in the spring fol- 

 lowing the year of test; this late germination shows that, under certain 

 conditions at least, delayed germination occurs in this species. 



The loft-stored seed showed no germination and was therefore ex- 

 cluded from the analysis . One jar of ground-stored seed had broken and 

 zero germination necessitated supplying the missing values by the iter- 

 ative method suggested by Snedecor (4) with appropriate adjustments in 

 calculations. For purposes of analysis data were transformed to angles 

 equal to the product of arc sin and the square root of the percentage. 

 Actual average values for germinates are set forth in table 1. 



Table 1 . Average germinative capacity of ponderosa pine seed after 

 14 years of storage 



. J . ^ ■, Storage methods 



Age, density, and - — — - - — 



... _L J -,^0 Root Under- Average 

 elevation of parent stand 32" F. 0° F. , ^ 

 cellar ground 



Percent of seeds sown 



Young, normal (4,000 ft.) 



(5,500 ft.) 

 Young, open (4,000 ft.) 



(5,500 ft.) 

 Old growth, scattered (4,000 



ft.) 



" " (5,500 



ft.) 



Average 



72.3 



72.3 



59.3 



53.7 



64.4 



74.0 



76.3 



54.3 



45.3 



62.5 



73.3 



57.3 



60.7 



47.3 



59.7 



74.7 



69.3 



65.0 



45.3 



63.6 



67 .3 



61.0 



49.7 



58.0 



59.0 



57.3 



56.7 



44.7 



47.7 



51.6 



69 .8 



65 .5 



55 .6 



49.6 





Analysis of variance revealed highly significant differences be- 

 tween origins and betv/een storage methods; i.e., the probability of these 

 differences being only chance ones is less than 1 in 100. There was also 

 a significant value for interaction; i.e., the relationship of storage 

 methods to the seed origins is unparallel and the likelihood of this 

 being chance variation is less than 5 in 100. 



To detect further the differences which analysis of variance indi- 

 cated, "t" tests were made for pooled differences of means between stor- 

 age methods, pooled differences in means between origins, and pooled dif- 

 ferences in means for all storage-origin combinations. 



These germination tests indicate that after 14 years the viability 

 of ponderosa pine seed from central Idaho can be reduced to zero if 

 storage has been under fluctuating temperatures where maxima reach 108° F 



