CALCULATION OF THE BOTATION FOB CONIFERS IN KULU. 95 



to that of the more valuable species comprising the bulk of this 

 working circle. 



" The rights also affect the rotation, as only a certain portion 

 from one-fourt- 1 to one-third of the forests can be closed at one 

 time. Further, it is not anticipated that regeneration of block 

 no. I can be effected in much less than 25 to 30 years. Another 

 point which will affect this calculation in the second rotation is 

 the quantity of cubic feet per acre produced at different ages. At 

 present only figures for single trees are available, and these are 

 sufficient for present needs ; but with even-aged fully stocked 

 woods these single figures will have to be superseded by the correct 

 figures for the volume of crops at different ages according to the 

 quality class. 



" Taking all these matters into consideration the rotation of 

 this circle for the present has been fixed at 120 years." 



The method of calculating the rotation for the coppice in 

 Changa Manga is interesting as showing what can be done without 

 exact yield tables. 



41 " The following figures show that a rotation of 20 years 

 is more profitable than one of 15 years : An area of 464'3 acres 

 felled at the age of 14, 15 and 16 years, the areas of 14 and 

 16 years old crop being equal to one another, yielded on the 

 average 2,678 cubic feet stacked of thick and 749 cubic feet 

 stacked of thin firewood per acre. An area of 596 acres felled at 

 the age of 19, 20 and 21 years, the areas of 19 and 21 years 

 old crop being equal to one another, yielded 4,238 cubic feet 

 stacked of thick and 1,323 cubic feet stacked of thin firewood 

 per acre. To obtain a fair and representative figure the areas for 

 which the yields have been taken in the above calculation are 

 situated in 9 compartments in the case of the 14, 15 and 16 years 

 old crops and 11 compartments in the case of 19, 20 and 21 years 

 old crops. They were all in compartments felled for the second 



Calcula- 

 tion o] the 

 rotation 

 for sissoo 

 and 



mulberry 

 coppice in 

 Chanya 

 Manga. 



Changa ffiCanga Working P/an. PARKER. 



