SAMPLE APPLICATION- NUMBER OF VIABLE SEED 

 FOR THE AREA OF INTEREST 



Assume that we have a 1,000-acre area for which we are estimating number of viable 



seed. 



A. Number of Serotinous Cones Per Acre 

 Method 1 



Assume the following measurements of three felled trees on a 1/50-acre plot: 



Table 1 .- -Measurements of three felled trees 



Tree 

 number 



: D.b.h. : 



Total height 



Crown length ; 



Age 



: Serotinous cones 

 : on 25 limbs 





Inches 



Feet 





Years 



Number 



1 



9 



90 



85 



100 



250 



2 



10 



80 



70 



100 



210 



3 



11 



90 



90 



102 



230 



Table 2 . --Values of variables to be entered in equation (1) 



Tree : 

 number : 



D.b.h. 2 



; Cr ; 



Cr2 ; 



Age 



: Serotinous cones 

 on 25 limbs 



1 



81 



0.944 



0.891 



100 



250 



2 



100 



.875 



.766 



100 



210 



3 



121 



1.000 



1.000 



102 



230 



Multiplying each of these by the appropriate coefficient (from page 2) and adding 

 the constant (-3.45), we have: 



Table !>. --Computations using equation (1) 



Tree 

 number : 



0.0807 

 (d.b.h.) 



: 60.3 : 

 : (Cr) ; 



: -58.7 : 

 : (Cr)2: 



: -0.0754 



: (age) 



: 0.1585 

 : (count) 



\ Constant 



* Sum \ 



(Sum) 2 or 

 cones per tree 



1 



6.54 



56.92 



-52.30 



-7.54 



39.62 



-3.45 



39.79 



1,583 



2 



8.07 



52.76 



-44.96 



-7.54 



33.28 



-3.45 



38.16 



1,456 



3 



9.76 



60.30 



-58.70 



-7.69 



36.46 



-3.45 



36.68 



1,345 



Plot sum 

















4,384 



Therefore, the estimate for this 1/50-acre plot is 4,384 serotinous cones. Assume 

 that we had estimates totalling approximately 110,000 cones from twenty-five such plots 

 distributed over the 1,000-acre tract. Then, since our total acres sampled would be 25 

 (1/50 acre) = 0.5 acre, we can convert the 110,000 cones to a per-acre figure and we 

 have : 



110,000 (1.0 acre/0.5 acre) = 220,000 cones per acre. 



7 



