SYLVICULTURE. 



its foothold in the soil under the influence of high winds; since it 

 allows of planting at almost any season of the year. 



On stony soil, the cylinder spade cannot be used. Edward 

 Heyer's "cone spade" facilitates the transfer of larger seedlings 

 with heavier balls of dirt from the nursery or from the woods to 

 new plantations. 



Paragraph XXV. Season for planting seedlings. 



Factors influencing the season are: 



Local climate. 



Labor available. 



Time available. 



Species planted. 



Theoretically seedlings should be planted during the pe: iod of 

 inactivity of roots and buds, or in mid-winter. This thenr^tical 

 demand, however, in a Northern climate, cannot be carried out, the 

 ground being frozen at that time. Hence the choice only remains 

 between planting in late fall and planting in early spring. After 

 Engler, roots show two periods of active growth, viz. : a spring-and- 

 summer period influenced by soil moisture, and a fall period in- 

 fluenced by soil heat. The growth of the roots during August and 

 September, between the two periods mentioned, is very weak. 



In spring, the growth of the roots starts in March and April 

 and shows the highest activity in May, June and July. 



A. Spring Planting. 



The seedlings are planted before the opening of the buds. The 

 moisture left in the soil by the melting snow is very favorable to 

 their growth. Objections to spring planting are: 



I. Scarcity of labor, unless forest planting begins at a time at 

 which fields are too wet to be worked. 



n. Larch, ]\Iaple, Cherry and Birch sprout so early in spring that 

 it is impossible to adopt spring -planting in their case. 



III. Moist ground, hummocks and swamps are not accessible in 

 spring. 



rV. The soil is not packed as tightly around the roots on tho 

 arrival of spring as is the case in fall planting. 



B. Fall Planting. 



Fall planting is preferred on wet areas and in the case of early 

 sprouting species. The disadvantages of fall planting otherwise out- 

 weigh the benefits combined therewith. 



I. Seedlings planted in fall are apt to be heaved up by the 

 winter's freeze. 



