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4.2.1 Temperature
The water availability zones were obtained from the isohyets line of rainfall average data of several rainfall observation stations. Rubber likely grows
and develops in humid area with warm temperature. Optimal temperature range for rubber is 26
C – 30 C.
Based on data from 6 climatology stations in South Sumatra Province between years 1980 and 2002, the average temperature is about 26.5
C without more one dry month in every year Table 12.
F
igure 9 shows temperature in Banyuasin Regency. There is one class e.i. highly suitable area S1.
Table 12 Summary of Climate Condition from Different Station
CLIMATE STATION
Coordinate dd Elevation
asl Temperature
C Season
month X
Y Max
Min Ave Wet
Dry
Sekayu 107.75
-2.75 9 m
28 22.3 26.2
11 1
Bukit Besar-UNSRI 104.85
-3.38 5 m
28.1 23.3 26.6
10 1
Talang Betutu 107.75
-3.00 11
28.1 23.3 26.7
10 1
Sei Pinang-Dewi Sri 104.85
-2.45 8
28 23.1 26.6
10 1
Sembawa 103.48
-3.08 10
29.6 21.6 26.4
10 1
Kayu Agung 102.83
-3.02 21
28 23.1 26.4
10 1
Note: Source: BMKG 1980 - 2002 Wet Season, if rainfall 100 mmmonth
Dry Season, if rainfall 60 mmmonth
4.2.2 Rainfall
Optimal annual rainfall range for rubber is 2500–3000 mmyears, respectively. The average of rainfall in Banyuasin Regency is 2500 mmyears.
Rainfall distribution has an important role to determine climate suitability area for rubber in Banyuasin Regency because temperature and the number of wet and dry
months are very suitable.
F
igure 10 shows rainfall in study area. There are two classes, e.i. highly suitable area S1 and moderately suitable area S2.
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Figure 9 Map of Temperature in Study Area
Figure 10 Map of Rainfall in Study Area
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4.2.3 Soil Texture
The Map of Tanah Semi Detail from BBSDLP classified the soil textures and soil drainage. Figure 11 shows soil texture for rubber in Banyuasin Regency.
Figure 11 clearly described the highly suitable area S1 in yellow color, moderately suitable area S2 in blue color, not suitable area N in young blue
color. It was found that about 14.6
of Banyuasin Regency is highly suitable S1; about
65.7 is
moderately suitable S2; and 19.4
is not suitable N for rubber plantation
.
Figure 11 Map of Soil Texture in Study area
4.2.4 Soil Drainage
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