949 
SLOPE * 
MHIZE/'SORGHUM 
SI 
8.8-2.8 
2.8-8.8 
S2 
8.8 -2.8 
2,8-8.8 
8.8-16.8 
RICE 
SI 
8.8-2.8 
S2 
8.0-2.8 
PINEAPPLE 
SI 
8.8 -2.8 
2.8-8.8 
S2 
8.8 -2.8 
2.0-8.8 
8.8-16.0 
Fig. 2.6 Values of attribute ’slope’ per crop 
class, displayed on screen.Crop 
requirements for an attribute. 
2.e Land suitability map. 
The matching information is linked with the actual 
map and a crop suitability map can be displayed 
(figure 2.8). A hard copy on an inkjet plotter can 
be made. 
2.f Printing tables. 
The constructed attribute, land unit and crop 
requirements tables can be printed on a printer 
(figure 2.9). 
2.g Overlay of maps 
A land suitability map can be overlayed with e.g. an 
infrastructure map (figure 2.10). 
COLOUR CHOICE FOR PIHEBPPLE S2 
red 
SUES! 
MS! 
ma 
3§?îili 
mm 
5 
blue 
3 
□ 
ípüijí 
tZ3 
MBI2E^SORGHUM 
RTCF 
yellow 
(_□ 
mm 
■PINËfiPPLE 
ATTRIBUTE TABLE 
SLOPE % 
SOIL TEXTURE 
SOIL DEPTH 
1. 0.0-1.9 
1. COARSE TEXTURED 
1. <50 cm 
2. 2.0-7.9 
2. MODR. COARSE TEXT. 
2. 50-180 cm 
3. 8.0-15.9 
3. MEDIUM TEXTURED 
3. >100 cm 
4. 16.0-24.9 
4. MODR. FINE TEXT. 
5. 25.0-55.8 
5. FINE TEXTURED 
Fig. 2.7 Colour choice for crop subclasses. Cursor 
can also be moved left or right 
to change column. 
INHER. FERT. 
PH RANGE 
SOIL DRAINAGE ! 
1. LOW 
1. 6.5-7.5 
1. VERY POORLY DRAINED! 
2. MEDIUM 
2. 5.5-6.5 
2. POORLY DRAINED ! 
3. HIGH 
3. 4.5-5.5 
4. 7.5-8.5 
5. <4.5 or >8.5 
3. IMPERFECT. DRAINED ! 
4. MODER.WELL DRAINED ! 
5. WELL DRAINED ! 
6.SOMEWH.EXCES.DRAINED! 
7. EXCESSIVELY DRAINED! 
MfilZE^SORGHUM 
Fig. 2.8 Landsuitabilitymap for maize/sorghum 
(black/white is not suitable) 
2.c Land unit and crop requirements table. 
These tables are constructed and edited by using the 
attribute table. Attributes and values are indicated 
by cursor movement. 
Each land unit or crop can be displayed per 
attribute with its values (figure 2.6). 
2.d Matching. 
To obtain a land suitability map for each defined 
crop the above mentioned tables (section 2.c) have 
to be matched. Each crop and its subclasses have to 
be assigned a color. This is done by displaying all 
possible colors on the screen and choosing by cursor 
movement (figure 2.7). 
FLOODING RISK 
1. NONE TO SLIGHT 
2. MODERATE 
3. HIGH 
Fig. 2.9 (a) Attribute table 
LAND SUITABILITY 
SLOPE % 
SOIL TEXT. 
SOIL DEPTH 
INHER.FERT. 
PHRANGE! 
VB1 
1 
5 
3 
2, 3 
2 ! 
VB2 
1 
5 
3 
2, 3 
2 ! 
VB3 
1 
5 
3 
2, 3 
2 ! 
TM 
1 
4 
3 
1 
2 ! 
AA 
1 
4 
3 
1, 2 
3 ! 
AO 
2 
3, 4 
2 
1 
3 ! 
AC 
5 
3, 4 
1 
1 
3 ! 
AE 
1 
3 
3 
1 
3 ! 
AV 
1 
3 
3 
1 
3 ! 
SOIL DRAINAGE 
FLOODING RISK ! 
B1 
2, 3, 4, 5 
1 ! 
B2 
2, 3, 4, 5 
2 ! 
B3 
2, 3, 4, 5 
3 ! 
M 
4 
1 ; 
AA 
5 
i ; 
AO 
5 
l : 
AC 
5, 6, 7 
1 ! 
AE 
2, 3 
3 ! 
AV 
3, 4, 5 
2 ! 
TM 
6, 7 
l ; 
Fig. 2.9 (b) Land unit table