STUDIES PRELIMINARY TO PLANTING 65 



results and for future economy to supply as large a quantity 

 of soil as is possible, in order to insure the establishment 

 and long life of the trees set out. 



Subsoil. If, on account of the impervious nature of the 

 subsoil, moisture is liable to collect and stagnate near the 

 roots and prevent a circulation of air, the soil will have to 

 be underdrained to insure the success of the plantation. 



Preparation of the Soil. How the soil for the tree is to 

 be prepared depends upon the condition of the original 

 ground, whether it is entirely good, partly good, or entirely 

 bad. If the soil is recognized as good and ample, it will 

 always be best to dig the hole of the regulation size and then 

 replace the original soil. The digging up of the soil will 

 make it more pervious to water and render the plant food 

 more available. 



If part of the soil is to be replaced, the hole should be 

 dug the full size, and the bad soil removed. The good soil 

 should then be mixed with the remainder and the hole 

 refilled. When all the soil is bad it will have to be entirely 

 replaced. When the soil is entirely or partly replaced, care 

 must be taken to supply enough to allow for settling, which 

 is about 1J inches to the foot. 



The preparation of the hole should precede the planting 

 some months, to allow for the settling of the soil. For spring 

 planting it is best to prepare the holes in the fall, so as 

 to leave more time for the setting of the trees during the 

 spring rush. 



ARRANGEMENT OF TREES ON STREET 



Parking Strips. On the street of average width, shade- 

 trees are usually planted on the sidewalk between the curb 

 and the walk. There should be a continuous parking strip 



