Part IT] Hole : Regeneration of Sal (Shorea robusta) Forests 45 
reported above justify the conclusion that, under the system of artificial 
sowings in narrow cleared patches and strips, a complete stock of estab¬ 
lished seedlings 3J feet high could be obtained, under favourable con¬ 
ditions of labour and seed supply, in 5 years, see paras. 32 
(3), 42 (5) (6) above. 
As a suitable organization of labour to deal with large areas, however, 
will require time, it is proposed at first to reduce the area to be dealt 
with annually and to extend the regeneration period to 15 years, this 
being divided into 3 sub-periods each of 5 years. 
Under the system advocated in this paper, therefore, it is believed 
that the regeneration period could be shortened by not less than 35 
years. 
Details of System of Regeneration proposed. 
50. The system of regeneration proposed is really a modified com¬ 
bination of the Group and Strip systems. Its main features are indi¬ 
cated by the following prescriptions : 
(а) Assuming the rotation to be 150 years, determine the average 
height of the forest at an age of 75 years. 
(б) Divide the area permanently into narrow strips running due 
north and south, the width of the strips to be fths of the 
average height of the forest at the age of 75 years. Thus, 
assuming the average height to be 80 feet, the width of the 
strips would be 60 feet. 
(c) Only the alternate strips are to be regenerated first, i.e. the 
regeneration area=J the total area. The remaining strips 
are not to be regenerated until the young growth on the 
regenerated strips has attained the height of 80 feet, i.e. 
when it is 75 years old. 
(d) The regeneration period to be 15 years, divided into three sub¬ 
periods of 5 years each. 
(e) Each strip of the regeneration area to be divided into segments, 
the length of each segment to be 3 times the width of the 
strip, i.e. in this case 180 feet, and each segment to contain 
3 unit areas, each 60 feet x 60 feet. The first unit will be 
regenerated in the first sub-period of 5 years, the second in 
the second sub-period, and the third in the third and last 
sub-period. An interval of 4 years to elapse between the 
felling of any two units in the same segment. In this 
way the rapid clearing of large areas and the establish¬ 
ment of a strong growth of weeds will be prevented. 
(/) In the area to be regenerated during each sub-period of 5 years, 
those units, already fully stocked with advance 
[ 207 ] 
