LONGLEAF PINE. 



23 



working of second-growth, well-stocked longieaf pine stands. 

 Caution is necessary, however, in using the table, since it should be 

 regarded as based upon insufficient data to make it final, but it is 

 probably the best of its kind available. It is not based upon actual 

 yields from whole stands, but has been computed from two sets 

 of independent measurements, one relating to the sizes and numbers 

 of trees per acre of growing longieaf stands (Table 1), and the 

 other relating to the flow of gum from a limited number of trees 

 of specified sizes (see Table 12). On the basis of this information, 

 secured by the Forest Service, U. S. Department of Agriculture, 

 the table was compiled jointly by the State Department of Con- 

 servation, Xew Orleans, La., and the Forest Service. It is included 

 here with the hope that it may be the means of stimulating the 

 collection of further measurements and the acquisition of more com- 

 plete information. The yield of gum per crop is exceedingly vari- 

 able, as is well known among operators, depending upon the locality 

 and region (extending from North Carolina to Texas), the season, 

 class of labor, and indirectly the market conditions. Hence, any 

 figures of yield should be used with discretion. 



Table 11. — Computed production of gum, turpentine, und rosin from well- 

 stocked second '-growth longieaf pine stands, of various ages (virgin, or first 

 year's working) .* 



Age of 

 stand. 



Production per crop. 



Produc- 

 tion 

 of gum 

 per cup. 



Production per acre. 



Cum. 



Turpen- 

 tine. 2 



Rosin. 2 



Gum. 



Turpen- 

 tine. 2 



Rosin. 2 



Years. 

 20 

 30 

 40 

 50 



Pounds. 

 37,000 

 53.000 

 08,000 

 74,000 



Barrels 

 (50 gals.). 

 18.5 

 26.5 

 34.0 

 37. 



Barrels 

 (500 lbs.). 

 61 

 88 

 113 

 123 



Pounds. 

 3.7 

 5.3 



6.8 

 7.4 



Pounds. 



186 



1,122' 



2,190 



2,760 



Gallons. 



4.6 



28.0 



51.7 



69.0 



Barrels 

 (500 lbs.). 

 0.3 

 1.9 

 3.7 

 4.6 



Trees 



per 



acre in 



all 



sizes). 



Trees cupped per acre (grouped by diameter sizes). 3 





Cups 

 per 

 acre. 



i tiameter ol trees— inches. 



Total. 



7 



8 



9 



in 



II 



12 



13 



(50 



865 

 908 



50 



70 

 38 



33 











50 

 210 

 241 

 250 



50 

 210 

 321 



371 



go 



13 



■■■ 



50 

 50 



in 











« 5 

 « 65 



15 

 58 







280 



25 



15 



1 Thi.s table i i computed from two different el ioI measurement land is not based upon actual asured 



yields ol whole stands. The working ol imall trees and young stands Is not good practice excepwwhere 

 tr<-<- . are 1<> i><- removed In thinning i or the laud to be cleared fur oilier uses. 



■ Production of turpentine and rosin calculated on the basis of 100 pounds of gum yielding 2j gallons 

 Of turpentine (one-t« entielh barrel I and B3 pounds of renin (one-sixth of a 500-pound barrel) 



i ip hung on each tree mea urlng 7 to 9 Inche , Inclu live, In diameter; two cup hung on al I 



tlfofthe 10-inch tree i and on all t ree i measuring 11 Inches and over. 

 * In the 40-year old land, 35 of the total 65 trees were 'i- cup trees; In the 50 pear-old land, 25 of the l • 

 aqd in both ca le the remainder of the 10-lnch cla i of tree were hung with one cup each 



