Some Notes on Jack Pine. 7 



SiLVICULTTJRAL REQUIREMENTS. 



Soil and Moisture. — Although Jack Pine owing to its frugality, 

 hardiness and fecundity, grows on a wide range or soils, it never- 

 theless demands for its best development fairly deep sandy glacial 

 till, such as is found on plateaux upland, — gently rising ground 

 where the drainage is good, and the moisture not far beneath the 

 surface. 



It grows still vigorously where hardwood, such as birch and 

 aspen will no longer thrive, where successive fires burning off the 

 loam and humus have created conditions unfavorable for their 

 growth. 



Over wide stretches of Laurentian country where these condi- 

 tions are present the Jack Pine holds the field. 



A mechanical analysis of typical pine soils made by the U. S. 

 Forest Service shows how, under natural conditions, the Jack 

 Pine seeks the coarser soils, although not necessarily confined to 

 them. 



The following table shows the percentage of the species found 

 on the different trades of soil. 



"e _: 



It will be noted that coarse sand and medium sand comprise in 

 a large degree the soils of the Laurentian country where Jack 

 Pine reaches its best development. 



Hundreds of square miles of just such sandy land exist between 

 Fort William and Kenora, deposited by glacial action, land which 

 is stocked with sapling growth of Jack Pine — potential wealth, 

 which would become actual, if the fires were kept out for 75 years. 



On the better soils Jack Pine in maturity averages 12 to 16 

 inches in diameter breast high outside the bark, and 75 to 82 feet 

 high, producing 3 to 5.2 ties per tree; whereas in Type II, low 

 flat, ridges, etc., Jack Pine is short, stunted, a low wide spreading 



