6 Forestry Quarterly 



How much this means in agriculture is strikingly brought out 

 by a study of corn production in Ohio {see Bulletin 266, Ohio 

 Experiment Station, p. 118), where it is shown that corn in Ohio 

 costs 61 cents a bushel to produce whenever the yield falls below 

 30 bushels. Such land, then, has practically no value for corn, 

 since the owner makes only expenses. On the other hand with 

 good land producing 40 to 50 bushels, the corn costs the farmer 

 only 29 cents per bushel and leaves him about 30 cents net income. 



Similarly the income value of land used in raising pine in North 

 Germany is, according to Schwappach {Kiefer, p. 150), under an 

 80-year rotation at 3 per cent interest rate : $74 per acre for site I ; 

 $45 for site II; $25 for site III; $5.50 for site IV; and is a negative 

 quantity or a loss of $8.90 per acre in site V. The expenses are 

 there, and even scrub woods need at least protection, and often 

 much more than the good timber. 



In a survey of a large forest area it is of no small importance 

 to know whether a portion of the land can not be expected to pay 

 at all, and what part is worth $5 and what $25 per acre. 



Some effort has been made in the determination of site in this 

 country. Just how much has been accomplished is not evident. 

 In various recent publications of yield tables the matter of site 

 has been considered, and it is interesting to examine a few of 

 these with regard to the limits set and the basis employed. 



Margolin in his study of White pine {see Woodman's Handbook, 

 1910, p. 198) establishes three sites as follows, for the stand 90 

 years old. 



Volume Corresponding Height 



Site 100 Cubic Feet Relative Value Feet Relative Value 



I 127 100 97 100 



II 110 87 93 96 



III 92 72 89 91 



Here, evidently a classification by volimie has been used, 

 following closely the scale represented in the recent Schwappach 

 tables, leaving out inferior lands or sites IV and V altogether. 



That the heights for the three sites vary so very little is sur- 

 prising and indicates the necessity of further field study. 



Sterrett in his studies of Loblolly pine (Bulletin 11, 1914) has 

 given us some very interesting and useful tables in which the 

 matter of site is fully recognized. He makes three sites which for 

 the 50-year-old stand, the oldest given, are as follows: 



