14 



BULLETIN 210, U. S. DEPARTMENT OF AGRICULTURE. 

 Table 6. — Size of seed and period of rest. 



Number of seeds per 

 pound. 



Seed that 

 germinated 

 within 144 



days. 



Number of seeds per 

 pound. 



Seed that 



germinated 



within 144 



days. 



22,000 



Per cent. 

 34.5 

 36.5 

 42.0 

 23.8 

 21.6 

 24.0 

 23.0 

 22.8 



31,000 



Per cent. 

 17.5 

 13.4 

 26.3 

 25.0 



24,000 



32,000 



25,000 



34,000 



26,000 



35,000 



27,000 



36,000 



28,000 



37,000 





29,000 



38,000.. 



19.0 



30,000 







The failure of such relationship to be clearly apparent is probably- 

 due more to deficient field data than to the actual absence of any such 

 relationship. 



The size of the seed and the germination percentage are closely 

 connected, as shown by Table 7. 



Table 7. — Relation of size of seed to germination. 



Number of seeds per 

 pound. 



Average 

 germina- 

 tion. 



25,000 



Per cent. 

 60 

 39 

 31 

 22 

 26 



30,000 



35,000 



40,000 



55,000 





The percentage of germination decreases with the increase in the 

 number of seed per pound — with the decrease hi size of the seed. 



8. Similarly, the length of cone has a perceptible effect upon the 

 quality of the seed, as shown in Table 8. 



Table 8. — Relation between length of cones and germination. 



Length of cones. 



Average 

 germina- 

 tion. 





Per cent. 

 26 

 41 

 40 

 43 











Thus it is fairly evident that seed from shorter cones possess a 

 lower germination percentage than seed from longer cones. 



9. Since the size of the cones goes hand in hand with the weight, 

 the following generalization may be made: The larger or heavier the 

 cones the larger is the seed, and the larger the seed the greater is the 



