84 A MANUAL OF FORESTRY. 



The method is exceedingly simple, and yields a degree 

 of regularity sufficient for most purposes, provided the 

 men are well trained to the work. 



8. Number of Plants. 



In the case of irregular planting the number of plants 

 required per acre can be roughly ascertained by dividing 

 with the square of the average planting distance, given 

 in feet, into 43560, the number of square feet in an 

 acre. 



For regular plantations the following calculations 

 apply :- 



Line planting : 



Length of area .... = L 



Breadth = B 



Distance between the rows . . d 



,, plants in the rows = d 1 '; 



then the number of rows = + 1, 



Cv 



T 



and the number of plants in each row = + 1, 



Cv 



hence the total number of plants : 



Square planting. Here d = d' and 



. 



d 1 d 



Triangle planting. Here the distance between the 

 rows is represented by the height of the equilateral 

 triangle, which is equal to d x sin 60 = d x -866 ; 



