FOREST TREE SEED AND SEED COLLECTING 



137 



AMOUNT OF SEED PER ACRE 



Zon 1 has recently published the results of the study of the seed 

 production of western white pine in Idaho by the sample plot 

 method. Four carefully selected sample plots were studied. ' The 

 trees were divided into five crown classes and the sample trees 

 selected from each. In the year that the study was made (1911), 

 98.8 per cent of the yield was obtained from the first two crown 

 classes and no seed from the last two. The year was one of aver- 

 age seed production and the yield was found to be as follows: 



Lbs. 



Plot I, yield of germinable seed per acre 5.4 



Plot II, yield of germinable seed per acre 2.5 



Plot III, yield of germinable seed per acre 0.6 



Plot IV, yield of germinable seed per acre 2.9 



2. THE LOCATION OF SEED AREAS 



As the fullness j)f the crop varies in the different localities of a 

 tree's range and in different years, a careful examination of the 

 available stands must be made before the maturity of the crop, 

 in order to locate areas where the seed crop is sufficiently heavy 

 to make collecting profitable. When a large quantity of seed is 

 required, a good deal of time can be wisely given to the location 

 of available seed areas. In locating these areas attention should 

 be given both to the abundance and quality of the seed. Locali- 

 ties where abundant crops abound should be avoided if on in- 

 spection the immature seed is badly infested with weevil or for 

 other reasons is likely to be of poor quality. In the location of 

 available seed areas not only should the abundance and quality 



1 Zon, Raphael: Seed production of western white pine. (U. S. Dept. of 

 Agr., Bui. 210. 1915.) 



