Sub- Institute of Forest Science of Southern Vietnam
Melaleuca cajuputi is a tree species popularly planted in severe acid sulphate soil in the Mekong River
Delta. Intensive management of M. cajuputi forest is a measure much interested by many forest owners now
to improve the efficiency of using acid sulphate soil. Factors of intensive management of forest consists of
seed selection, land preparation, forest tending... Which factors are decisive in improvement of intensive
management of M. cajuputi forest in severe acid sulphate soil in the in the Mekong River Delta is the
problem dealt with in this research- General and long term objective of the research subject is to establish
intensive M. cajuputi forest management model in severe acid sulphate soil in the Mekong River Delta.
Concrete research objectives in the early stage are:
1208) of 2 selected species: M. cajuputi and M.leucadendra.
2.Comparison of height increment of M. cajuputi (7v09) planted with two types of seedlings ( (bare-rooted
I. Research methods and material
1. Research material:
- Two M. cajuputi provenances: 7v05, 7v09 and four M.leucadendra: 1201, 1206, 1207, 1208. List of species
Table 1.List of species and provenances in the trial
were selected. For evaluation and comparison as regards height increment, survival rate of the trees.
-Planting density trial: 3 planting density levels selected for the experiment were 6,700 trees/ ha (1 x1.5m),
As regards height index, the two above trials were laid out in split- plot design in which main plot is for
As regards survival rate of the trees, the provenances were laid out in complete randomised block design
Thanh Hoa Forest Experimentation Station, Long An province.
b.Experiment 2: Experimenting with types of seedlings in forest planting.
This experiment is aimed at evaluating height increment of M. cajuputi, provenance 7v09 planted with bare
randomised block design at density of 20,000 trees/ ha. Planting date: Oct. 1998.
2.2. Data collection
Code of species
Name of species
Name of provenance
TÞnh Biªn- An Giang
Th¹nh Ho¸- Long An
Page 1 of 4
- Experiment1: +Measured indices were height and survival rate of the trees, measurement date:
- Experiment 2: +Measured index was height, measurement date Oct. 2000.
2.3.Method of data treatment
Method of analysis of variance was applied to compare height increment and survival rate of 5 provenances
The two above mentioned analysis methods were all treated with programme Excel.
Table 3. Results of analysis of variance in height of M. cajuputi and M. leucadendra trees in the
Table 3 shows the difference in average height increment between provenances (F
= 0.1138, F
= 9.55) and at the same time there is no interaction between planting density and the
= 0.7932 F
Note:*Difference at P = 0.05
** Difference at P = 0.01
Sources of variation
Page 2 of 4
ns: no difference
1.2.Comparison of survival rate of the trees
Survival rates of M. cajuputi and M. leucadendra trees at two planting density levels are as follows:
Table 5. Survival rates (%) of 5 provenances at 2 density levels: 10,000 trees/ ha and 20,000 trees/ ha.
density of 10,000 trees/ ha.
density of 20,000 trees/ ha.
level (at density of 10,000 trees/ ha: Fcalculated = 1.7537 < Ftabular = 3.0556).
2. Experiment 2: trial of types of seedlings in forest planting.
Results of comparison of two types of seedlings in forest planting (ball- seedlings and bare-rooted
Table 8. Comparison of height of two types of seedlings in forest planting.
height increment (t calculated =0.6560 < tabular).
provenances in the experiment are classified into 3 levels from high to low in Table 9.
Table 9. Classification of height increment of the provenances
Source of variation
Number of observations
Degree of freedom (df)
P (T<=t) 1 tail
P (T<=t) two tails
Page 3 of 4
+There is no difference in survival rate among 5 provenances of M. cajuputi and M. leucadendra in the
experiment at two density levels 10,000 trees/ ha and 20,000 trees/ ha.
+With provenance Thanh Hoa (Long An) of M. cajuputi, the planting with bare – rooted or ball- seedlings
1.Andrew, I., 1986 Simple experimental design for forestry trials, FRI Bulletin No 71.
2.Gomez, K.A gomez, A.A, 1984. Statistical procedures for Agricultural research, John Wiley & Sons, New
3.Nguyen Ngoc Kieng, 1986. Statistics in Scientific Research. Education Publishing House.
5.58 and 5.58
5.29 and 4.89