TEAK PLANTATIONS IN NILAMBUR - Kerala Forest Research Institute

The total number of plantations (operations) given in Table 3.3 is not the
sum of that in Table 3.1 and 3.2, since the age limits for different operations
in all the three sets are different. Four plantations excluded earlier were
included in the combined period as the age limits were wider. Appendix 4
gives the age limits considered for different types of work.
The mean yield for each operation in the table is the weighted mean using
area of the plantation as the weight. To show the degree of variability in yield
between plantations, the minimum and maximum yields obtained are shown.
The coefficient of variation is also presented in the tables.
Table : 3.1
Average yield from teak plantations in Nilambur Divisions worked during
the period 1967 to 1981
Type of
Mean
No of
Total
Yield (m3/ha)
work age Plantations Area (ha).
1M 5 10 377.217
2M 8 24 1071.752
1s 12 30 1379.413
2S 18 34 1568.731
3S 29 53 1565.240
4S 41 78 1605.280
FF 56 22 774.388
Total
251 8342.021
Mean
5.729
6.158
7.070
4.979
17.418
16.791
107.250
165.396
CV(%)* Min Max
56.0 1.038 11.648
21.5 3.602 10.737
26.7 0.215 10.996
76.3 0.174 13.857
39.2 1.983 24.732
37.5 4.674 45.468
40.2 57.911 225.735
69.597 343.173
MAI at 56 Years (m3/ha/yr) 2.954 1.243 6.128
* CV - Coefficient of variation
Source : Computed from data collected from files of the Forest Department
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