56 



TABLE SHOWING COURSE OP INCREMENT OF THE STEM. 



5. Kate of increase of crop*. 



lu the case of crops it is obvious that, we require to know only 

 the rate at which the volume of the crop increases, and that 

 a knowledge of the rates at which the height of the crop and the 

 aggregate diameters and basal areas of the component stems in- 

 crease, is of interest only so far a& these element* are so many 

 factors in the growth of the crop. 



A. Determination of the increment ftt nny lime. 



There are various methods of determini-ng the rate at which a 

 crop has been augmenting in volume at any time. They are 



I. BY MEANS OP INVESTIGATIONS IN THE CROP ITSELF. In 



determining- the increment it must never be forgotten 

 that no oue class of stems can be taken as representative 

 of the whole crop, any more than any individual stem 



