FIGURE 6. SITE INDEX CURVES 

 FOR SLASH PINE 



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Site Index Curves on pages 17-20 from 

 Avery and Herrick. 



Original Source: U.S. DA Miscellaneous 

 Publication No. 50. 



10 



1. Locate a stand of the desired tree species. A 

 minimum of 6 to 10 dominant and codomi- 

 nant trees should be measured for total height 

 and age. The required number of samples may 

 also be determined by this rule-of-thumb 

 formula : 



Number of sample trees = 5 + 



R 2 



30 



Where "R" is the estimated range 

 of total heights of dominant and 

 codominant trees in the stand. For 

 example, if the range in total 

 heights of dominant and codomi- 

 nant trees is 20 feet, the number of 



sample trees would be 5 

 or 18. 



(20) 2 

 "30 



AVAILABLE SOIL SURVEYS 



Figure 2 shows the status of Soil Surveys as 

 of 1964 within Georgia. 



Information furnished in the soil survey of 

 each county includes: 



1. Soil mapping unit index. (See Figure 3), 



2. Detailed soil maps prepared from aerial 

 photographs. (See Figure 4). 



A theoretical ownership is plotted on Figure 

 4. Because maps on the scale used in Figure 4 

 are difficult to work with, larger scale maps 

 should be obtained, if possible, from the SCS 

 by County officials. Perhaps the State Revenue 

 Department could make arrangements to obtain 

 the larger scale maps where available. 



The acreage in different soil series of the 

 ownership must first be determined. This can 

 be done by use of a polar planimeter or dot grid. 

 Then the woodland suitability group of each 

 soil series represented must be determined by 

 use of either the County Soil Survey (now avail- 

 able in ten counties) or the tables and informa- 

 tion found in the appendix (taken from Soil 

 Survey Interpretations For Woodland Conser- 

 vation) . 1 - The site index of each soil series 

 should be determined; this information is re- 

 corded on Form 2 (Figure 5), and calculations 



12 United States Department of Agriculture, Soil Con- 

 servation Service, op. cit. 



FIGURE 5. 



Property owner 



County 



Resource area 



Person 



preparing 



form 



John H. Smith 



Doug- 

 las 



Piedmont 



Al Jones 



1 



2 



3 



4 



5 



6 



Soil 

 series 



Gross 

 acreage 

 in forest 



Wood- 

 land 

 suita- 

 bility 

 group 



Species 

 short- 

 leaf 



Site 

 index 



Col. 2X 

 Col. 5 



Aim 



Alp 



LeC 3 



LjE, 



LjF 



MiC 3 --.- 

 MiD 3 



8.3 



3.2 



1.3 



36.3 



'6.4 



.6 



.6 



2 



2 

 4 

 5 

 5 

 4 

 6 



Lob. P 

 Lob. P 

 Lob. P 

 Lob. P 

 Lob. P 

 Lob. P 

 Lob. P 



75 



105 



80 



80 



80 

 80 

 75 



622.5 



336.0 



91.0 



2904.0 



512.0 



48.0 



45.0 



Totals 



56.7 











4558.5 















Average site index = Total wt. (Col. 6) =4558.5 = 80 



Total forest acreage (Col. 2) 56.7 



31 



