INVESTIGATIONS IN WHITE PINE PLANTATIONS. 



17 



TABLE 5. Growth of planted Norway spruce, East Greenwich, R. L 

 PLANTATION OF H. G. RUSSELL. 

 [Based on 30 trees 23 years planted.] 



Tables 4 and 5 represent planted groves of white pine and Norway 

 spruce, each 23 years of age, and give opportunity for a comparative 

 study. 



The area from which Table 4 was taken has a light, sandy soil. 

 It has a little undergrowth of white oak and red cedar and a small 

 amount of white pine reproduction. The forest floor is composed of 

 1 to H inches of needles. The suppressed trees constitute only 3 per 

 cent of the stand, and those which have made extra rapid growth 6 

 per cent. Thus 91 per cent of the grove has made an evenly distrib- 

 uted height increment of from 22 to 39 feet. 



Division I, Table 5, containing trees 23 to 28 feet in height, consti- 

 tutes 10 per cent of the stand, and Division III contains 14 per cent. 

 Division II, comprising 76 per cent of the total stand, is made up of 

 trees averaging from 29 to 30 feet in height and from 7 to 8 inches 

 in diameter. The growth here is very much more even than that of 

 white pine of the same age and under similar conditions. While the 

 pine grows from 22 to 39 feet, the spruce grows from 29 to 36 feet. 

 The average diameter growth of the spruce has been 1 inch in three 

 and one-half to four and one-half years, while that of the pine has been 

 about 1 inch in three years. The spruce makes a rapid growth, pro- 

 duces seed prolifically, and is of good form for utilization, being 

 straight and conical. Its value is much enhanced for tree-planting 

 purposes because of its early maturity and excellent qualities for gen- 

 eral usage. 



20279 No. 4504 2 



