RATE OF GROWTH IX EVEN-AGED 8TAXDS 73 



involved, as a thorough review of the prorediire in growth stucUes. Refer- 

 ences are made to previous problems, but the student will gain the greatest 

 benefit from this exercise if he does not make use of them until he has found 

 by actual Irial that he cannot work out the problems without using the 

 references, 



Directions: 



A. Parties. — 3 mer. 



B. Equipment. — After reading over the exercise the student should deter- 



mine what equipment is required. (See Problems 6 and 7.) Ask the 

 instructor if yo\i are right before starting for the field. The chief of 

 party will be held responsible. 



C. Method of Procedure. 



1. Use the original data and the felled sample trees obtained in the 



Mean Sample Tree method of Problem 33. 



2. Make a complete stem analysis of the felled sample trees. (Use regular 



analysis sheet for recording measurements. Forms 2, A and B.) 



3. Work out the following problems. Arrange all work in logical order: 

 (a) Construct a table of diameter growth at the stump. (See Problem 



26.) 

 (6) Construct a height growth table on total age. (See Problem 29.) 

 (c) Construct a cubic foot volume growth table in 10-year periods. 



Use Graves' Modification of Mlodjianski's Method. (See 



Problem 31.) 

 {d) From (r) determine the volume growth per acre in cubic feet. 



D. Discussion. 



1. Under what conditions would the method of this problem give satis- 



factory results concerning growth? When applied to mature stands, 

 of which trees onhj does it show the growth throughout the entire 

 life of the stand? 



2. Which of the following methods would give the most satisfactory 



results for a growth study: Mean Sample Tree, Arbitrary Group, 

 Draudt, or Urich? Why? 



3. How many plots would be considered sufficient for a reliable study in 



any one type? How large would you say, judging from your 

 studies involving the use of plots, should plots ordinarily be to 

 insure getting average conditions? 



4. How would you modify the method of procedure if this problem were 



to be carried out in a mixed stand? 



