June 14, 1924 
Western White Pine Seed 
1129 
IMPORTANCE OF DATE OF FALL SOWING 
The superiority of fall over spring sowing of this species was so marked in 
the early experiments that it seemed as if the problem were solved, but it soon 
appeared that the correct time in the fall season for doing the sowing was also 
very important. 
Fig. 1 .—Germinative energy of western white-pine seed at Savenac Nursery as influenced by season 
of sowing 
Fig. 2.—Results of sowing of Kaniksu seed, 1917 * 
In the fall of 1916, at 10-day intervals from August 21 to October 28, twenty- 
eight plots of 1,000 seeds each were sown. From the results of this series early 
fall sowing is indicated as best, in order to reduce to a minimum the germination 
occurring after the month of June; but a different seed lot, germinating the 
highest total number, yielded only a small number of germinations after June 30 > 
even from late sowings. Based on the highest number of seedlings germinating 
promptly the first season, September 1 was the optimum time to sow in 1916. 
96462—24t-6 
