CHAPTEE IV. 



GBOWTH AND YIELD. 



WHEN a forest area has been successfully regenerated with 

 young plants and saplings, and the forest crop successfully objects of 

 started, the duty and art of the forester lies in nursing up the young 

 crop to maturity under the best possible conditions of growth, so 

 that the objects of management (in India usually the highest 

 volume production of valuable timber, or sometimes of poles or 

 firewood) may be most completely attained. 



The objects of statistical research may be briefly defined as 

 supplying the forester with the data necessary to carry out this 

 duty successfully, and these necessary data may be summarized 

 under the following headings : 



(a) The correct density of the crop (i.e. number of trees per 

 acre) at all ages. Some species require to be densely 

 grown, (e.g., silver fir and deodar). Others require to be 

 very openly grown (e.g., simal and sissoo), and statistical 

 research affords a clear indication how the important 

 art of thinnings should be carried out, and gives also a 

 figure of intermediate yields t hat may be expected from 

 these thinnings. 



(6) Yield and increment. Statistical research supplies figures 

 of what may be expect ed for the final and total 

 (including intermediate) yields at all ages, and hence 

 the annual increment of production. 



(c) Rotation. The figures of yield and increment supply data 

 for ascertaining when the crop is financially ripe, and 

 for fixing the correct rotation ; and since the stock per 

 acre, the yields, the rotation, and in fact the whole 

 management of the crop depends largely on its quality, 



Vt 



