KEDUOED ABEAS. 133 



It has been mentioned above that the working plan officer Reduced 

 must arrange to equalise the yield in the different periods. This areas. 

 is a matter \hich has not received sufficient attention in several 

 working plans, where the best quality sites were all allotted to 

 periodic block no. I and the worst to other periods, which must 

 result in the future in a decreased yield. Where the periods are 

 distributed over the whole area of the working circle, consisting of 

 both good and bad compartments in similar proportions, so that the 

 average quality class of the crops contained in the various periods is 

 approximately the same and the area of the several periodic blocks 

 approximately equal, no great necessity for a system of reduced 

 areas arises. In other cases steps must be taken to reduce 

 every compartment to the same standard of productivity. This 

 may be done in a comparatively small working circle such 

 as Chuka by the working plan officer taking the best areas as=l 

 and the other compartments as = '8 or '6 as the case may be. The 

 reduced area of every compartment is then calculated and equal 

 reduced areas allotted to each period. 



It has already been shown in chapter III that the different 

 yield capacity of the different quality classes shown in the yield 

 table is demonstrated by the differences in the M. A. I. It is 

 obviously impossible to adopt fixed figures of yield capacity for 

 different divisions or Working Circles in the province, since 

 variations in the rotation will vary the figures, and also there will 

 be considerable differences if timber production only is considered 

 or if total wood production is reckoned on. And again with 

 close and intensive management the broad quality classes of the 

 yield table may require sub-division into intermediate classes, 

 especially where the qualities of different compartments vary 

 appreciably but not enormously. Every working plan officer will 

 have to consider the peculiar conditions of the area he is dealing 

 with, and from the data and yield tables available, work out 



