40 



CIRCULAR 3 3 3, U.S. DEPARTMENT OF AGRICULTURE 



tendency is to take too few height measurements rather than too 

 many, largely because height measurement is tedious and consumes 

 much time. 



In some growth investigations in young even-aged stands, as 

 in yield or thinning studies, it may be appropriate to record heights 



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EXTENSION 

 re 2. — A sliding scale for height measurement? 



for only a sample of the stand on each plot. Thus data on heights 

 might be taken, at each measurement period, only on a sufficient 

 number of individuals to give a strong diameter-height curve. In 

 such cases a separate curve should be prepared for each species on 

 the plot, representing all crown classes present. On plots with 

 understocked or irregularly spaced stands groups of trees should 

 be sampled, also, so as to obtain data on the effect of spacing. 



