323 JOURNAI. OF FORESTRY 



The following data are of interest in this connection : 

 The first two tables show separately for northern and southern Cali- 

 fornia Jefifrey-pine seed the results of tests on seed of different ages. 

 Though based on a small number of tests, it seems apparent that no 

 serious loss in germinating power occurs up to the fourth year, and 

 that seed several years old can safely be used. 



Table 2. — Jejfrey Pine — Effect of Age on Genninaiion 

 Northern California Seed 



G. N. G. 



^^ C. T. G. N. C T. C. T. N. No. 



New 79 65 63 82 77 94 6 



1 year 75 63 61 83 82 98 4 



2 years 77 d^ 74 8<'t 96 116 2 



3 years 76 52 57 69 75 •• i 



4 years 80 80 73 luo 91 .. i 



Table 3. — Jeffrey Pine — Effect of Age on Germination 

 Southern California Seed 



G. N. G. 



^^ C. T. G. N. C. T. C. T. N. No 



New 80 63 53 79 67 84 5 



1 year 77 42 36 54 46 86 5 



2 years 74 52 42 70 57 83 5 



3 years 70 44 47 62 67 107 5 



4 years 62 41 44 66 70 106 i 



The next two tables show similar data for yellow pine : 



Table 4. — Yellow Pine — Effect of Age on Seed 

 Northern California Seed 



G. N. 



Age G., N., 



C. T. 120 days 120 days C. T. C. T. No. 



New 77 64 64.5 83 83 3 



1 year 86 72 71 84 83 4 



2 years 81 75 68 92 84 5 



3 years 90 60 56 67 62 6 



4 years 



Average 84 67 64 80 75 18 



For the first two years the seed, properly stored, does not lose in 

 germination per cent and the germination in the nursery equals the 

 greenhouse. The reduced germination due to age is first shown to be 

 three years and the nursery values fall off more than the greenhouse. 

 Variations from year to year are negligible. 



